Online tool for base64 decode.
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Free online tool for base64 decode. Here with our this online tool. Enjoy free service ! thanks for using it. What is base64 ? base64 is one of several base 32 transfer encodings using a 32-character subset of the twenty-six letters A–Z and ten digits 0–9. Primarily base64 is used to encode binary data, but is able to encode binary text like ASCII.

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Base64 Encoding Google Cloud Vision Api Documentation - Free Base64 Decode Encode Online Converter Tool

You Perform Base64 Encoding Of Image Files Depends On The Way In Which You Send Your Requests The Base64 Command-line Tool Can - Free Base64 Decode Encode Online Converter Tool

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Category: online base64 decode
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LOGO Base64 Encoding Google Cloud Vision Api Documentation - Free Base64 Decode Encode Online Converter Tool

Base64 Encoding Google Cloud Vision Api Documentation - Free Base64 Decode Encode Online Converter Tool

You Perform Base64 Encoding Of Image Files Depends On The Way In Which You Send Your Requests The Base64 Command-line Tool Can - Free Base64 Decode Encode Online Converter Tool

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Written by Administrator
Category: Base64 Encoding Google Cloud Vision Api Documentation - Free Base64 Decode Encode Online Converter Tool
Published: 01 January 2018 Published: 01 January 2018

Base64 Encoding Google Cloud Vision Api Documentation - Free Base64 Decode Encode Online Converter Tool

Published: 01 January 2018 Published: 01 January 2018
Reviewed by: Administrator
Review of: http://base64-decode.softbaba.com/vision/docs/47-base64
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Reviewed by: Administrator
Rating:
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On February 15, 2018
Last modified:February 11, 2018

Summary:

You Perform Base64 Encoding Of Image Files Depends On The Way In Which You Send Your Requests The Base64 Command-line Tool Can - Free Base64 Decode Encode Online Converter Tool

More Details

http://base64-decode.softbaba.com/vision/docs/47-base64

http://base64-decode.softbaba.com/vision/docs/47-base64

Review of: http://base64-decode.softbaba.com/vision/docs/47-base64
Version:
Raw Cacao
Price:
$0.00

Reviewed by: Administrator
Rating:
5
On February 15, 2018
Last modified:February 11, 2018

Summary:

You Perform Base64 Encoding Of Image Files Depends On The Way In Which You Send Your Requests The Base64 Command-line Tool Can - Free Base64 Decode Encode Online Converter Tool

More Details

http://base64-decode.softbaba.com/vision/docs/47-base64

http://base64-decode.softbaba.com/vision/docs/47-base64

What is base64 ?

Base64 is a group of similar binary-to-text encoding schemes that represent binary data in an ASCII string format by translating it into a radix-64 representation. The term Base64 originates from a specific MIME content transfer encoding.

The particular set of 64 characters chosen to represent the 64 place-values for the base varies between implementations. The general strategy is to choose 64 characters that are both members of a subset common to most encodings, and also printable. This combination leaves the data unlikely to be modified in transit through information systems, such as email, that were traditionally not 8-bit clean. For example, MIME's Base64 implementation uses A–Z, a–z, and 0–9 for the first 62 values. Other variations share this property but differ in the symbols chosen for the last two values; an example is UTF-7.

The earliest instances of this type of encoding were created for dialup communication between systems running the same OS — e.g., uuencode for UNIX, BinHex for the TRS-80 (later adapted for the Macintosh) — and could therefore make more assumptions about what characters were safe to use. For instance, uuencode uses uppercase letters, digits, and many punctuation characters, but no lowercase.

The example below uses ASCII text for simplicity, but this is not a typical use case, as it can already be safely transferred across all systems that can handle Base64. The more typical use is to encode binary data (such as an image); the resulting Base64 data will only contain 64 different ASCII characters, all of which can reliably be transferred across systems that may corrupt the raw source bytes.

A quote from Thomas Hobbes' Leviathan (be aware of spaces between lines):

Man is distinguished, not only by his reason, but by this singular passion from other animals, which is a lust of the mind, that by a perseverance of delight in the continued and indefatigable generation of knowledge, exceeds the short vehemence of any carnal pleasure.

is represented as a byte sequence of 8-bit-padded ASCII characters encoded in MIME's Base64 scheme as follows:

TWFuIGlzIGRpc3Rpbmd1aXNoZWQsIG5vdCBvbmx5IGJ5IGhpcyByZWFzb24sIGJ1dCBieSB0aGlz IHNpbmd1bGFyIHBhc3Npb24gZnJvbSBvdGhlciBhbmltYWxzLCB3aGljaCBpcyBhIGx1c3Qgb2Yg dGhlIG1pbmQsIHRoYXQgYnkgYSBwZXJzZXZlcmFuY2Ugb2YgZGVsaWdodCBpbiB0aGUgY29udGlu dWVkIGFuZCBpbmRlZmF0aWdhYmxlIGdlbmVyYXRpb24gb2Yga25vd2xlZGdlLCBleGNlZWRzIHRo ZSBzaG9ydCB2ZWhlbWVuY2Ugb2YgYW55IGNhcm5hbCBwbGVhc3VyZS4=

In the above quote, the encoded value of Man is TWFu. Encoded in ASCII, the characters M, a, and n are stored as the bytes 77, 97, and 110, which are the 8-bit binary values 01001101, 01100001, and 01101110. These three values are joined together into a 24-bit string, producing 010011010110000101101110. Groups of 6 bits (6 bits have a maximum of 26 = 64 different binary values) are converted into individual numbers from left to right (in this case, there are four numbers in a 24-bit string).

What is base 64 encoding used for?

When you have some binary data that you want to ship across a network, you generally don't do it by just streaming the bits and bytes over the wire in a raw format. Why? because some media are made for streaming text. You never know -- some protocols may interpret your binary data as control characters (like a modem), or your binary data could be screwed up because the underlying protocol might think that you've entered a special character combination (like how FTP translates line endings).

So to get around this, people encode the binary data into characters. Base64 is one of these types of encodings.

Why 64?

Because you can generally rely on the same 64 characters being present in many character sets, and you can be reasonably confident that your data's going to end up on the other side of the wire uncorrupted.

Aside from what's already been said, two very common uses that have not been listed are

Hashes:

Hashes are one-way functions that transform a block of bytes into another block of bytes of a fixed size such as 128bit or 256bit (SHA/MD5). Converting the resulting bytes into Base64 makes it much easier to display the hash especially when you are comparing a checksum for integrity. Hashes are so often seen in Base64 that many people mistake Base64 itself as a hash.

Cryptography:

Since an encryption key does not have to be text but raw bytes it is sometimes necessary to store it in a file or database, which Base64 comes in handy for. Same with the resulting encrypted bytes.

Note that although Base64 is often used in cryptography is not a security mechanism. Anyone can convert the Base64 string back to its original bytes.

The MIME (Multipurpose Internet Mail Extensions) specification lists Base64 as one of two binary-to-text encoding schemes (the other being quoted-printable). MIME's Base64 encoding is based on that of the RFC 1421 version of PEM: it uses the same 64-character alphabet and encoding mechanism as PEM, and uses the "=" symbol for output padding in the same way, as described at RFC 2045.

MIME does not specify a fixed length for Base64-encoded lines, but it does specify a maximum line length of 76 characters. Additionally it specifies that any extra-alphabetic characters must be ignored by a compliant decoder, although most implementations use a CR/LF newline pair to delimit encoded lines.

Thus, the actual length of MIME-compliant Base64-encoded binary data is usually about 137% of the original data length, though for very short messages the overhead can be much higher due to the overhead of the headers. Very roughly, the final size of Base64-encoded binary data is equal to 1.37 times the original data size + 814 bytes (for headers). The size of the decoded data can be approximated.

Base64 encoding can be helpful when fairly lengthy identifying information is used in an HTTP environment. For example, a database persistence framework for Java objects might use Base64 encoding to encode a relatively large unique id (generally 128-bit UUIDs) into a string for use as an HTTP parameter in HTTP forms or HTTP GET URLs. Also, many applications need to encode binary data in a way that is convenient for inclusion in URLs, including in hidden web form fields, and Base64 is a convenient encoding to render them in a compact way.

What is the real purpose of Base64 encoding?

Base64 is a way to encode binary data into an ASCII character set known to pretty much every computer system, in order to transmit the data without loss or modification of the contents itself. For example, mail systems cannot deal with binary data because they expect ASCII (textual) data. So if you want to transfer an image or another file, it will get corrupted because of the way it deals with the data.

Note: base64 encoding is NOT a way of encrypting, nor a way of compacting data. In fact a base64 encoded piece of data is 1.333… times bigger than the original datapiece. It is only a way to be sure that no data is lost or modified during the transfer.

Why do we use Base64?

Your first mistake is thinking that ASCII encoding and Base64 encoding are interchangeable. They are not. They are used for different purposes.

When you encode text in ASCII, you start with a text string and convert it to a sequence of bytes. When you encode data in Base64, you start with a sequence of bytes and convert it to a text string. To understand why Base64 was necessary in the first place we need a little history of computing.

Computers communicate in binary - 0s and 1s - but people typically want to communicate with more rich forms data such as text or images. In order to transfer this data between computers it first has to be encoded into 0s and 1s, sent, then decoded again. To take text as an example - there are many different ways to perform this encoding. It would be much simpler if we could all agree on a single encoding, but sadly this is not the case.

Originally a lot of different encodings were created (e.g. Baudot code) which used a different number of bits per character until eventually ASCII became a standard with 7 bits per character. However most computers store binary data in bytes consisting of 8 bits each so ASCII is unsuitable for tranferring this type of data. Some systems would even wipe the most significant bit. Furthermore the difference in line ending encodings across systems mean that the ASCII character 10 and 13 were also sometimes modified.

To solve these problems Base64 encoding was introduced. This allows you to encode aribtrary bytes to bytes which are known to be safe to send without getting corrupted (ASCII alphanumeric characters and a couple of symbols). The disadvantage is that encoding the message using Base64 increases its length - every 3 bytes of data is encoded to 4 ASCII characters.

To send text reliably you can first encode to bytes using a text encoding of your choice (for example UTF-8) and then afterwards Base64 encode the resulting binary data into a text string that is safe to send encoded as ASCII. The receiver will have to reverse this process to recover the original message. This of course requires that the receiver knows which encodings were used, and this information often needs to be sent separately.

Historically it has been used to encode binary data in email messages where the email server might modify line-endings. A more modern example is the use of Base64 encoding to embed image data directly in HTML source code. Here it is necessary to encode the data to avoid characters like '<' and '>' being interpreted as tags.

What is base 64 encoding used for?

When you have some binary data that you want to ship across a network, you generally don't do it by just streaming the bits and bytes over the wire in a raw format. Why? because some media are made for streaming text. You never know -- some protocols may interpret your binary data as control characters (like a modem), or your binary data could be screwed up because the underlying protocol might think that you've entered a special character combination (like how FTP translates line endings).

So to get around this, people encode the binary data into characters. Base64 is one of these types of encodings.

Why 64?
Because you can generally rely on the same 64 characters being present in many character sets, and you can be reasonably confident that your data's going to end up on the other side of the wire uncorrupted.

It's basically a way of encoding arbitrary binary data in ASCII text. It takes 4 characters per 3 bytes of data, plus potentially a bit of padding at the end.

Essentially each 6 bits of the input is encoded in a 64-character alphabet. The "standard" alphabet uses A-Z, a-z, 0-9 and + and /, with = as a padding character. There are URL-safe variants.

Wikipedia is a reasonably good source of more information.

It's a textual encoding of binary data where the resultant text has nothing but letters, numbers and the symbols "+", "/" and "=". It's a convenient way to store/transmit binary data over media that is specifically used for textual data.

But why Base-64? The two alternatives for converting binary data into text that immediately spring to mind are:

  1. Decimal: store the decimal value of each byte as three numbers: 045 112 101 037 etc. where each byte is represented by 3 bytes. The data bloats three-fold.
  2. Hexadecimal: store the bytes as hex pairs: AC 47 0D 1A etc. where each byte is represented by 2 bytes. The data bloats two-fold.

Base-64 maps 3 bytes (8 x 3 = 24 bits) in 4 characters that span 6-bits (6 x 4 = 24 bits). The result looks something like "TWFuIGlzIGRpc3Rpb...". Therefore the bloating is only a mere 4/3 = 1.3333333 times the original.

Aside from what's already been said, two very common uses that have not been listed are

Hashes:

Hashes are one-way functions that transform a block of bytes into another block of bytes of a fixed size such as 128bit or 256bit (SHA/MD5). Converting the resulting bytes into Base64 makes it much easier to display the hash especially when you are comparing a checksum for integrity. Hashes are so often seen in Base64 that many people mistake Base64 itself as a hash.

Cryptography:

Since an encryption key does not have to be text but raw bytes it is sometimes necessary to store it in a file or database, which Base64 comes in handy for. Same with the resulting encrypted bytes.

Note that although Base64 is often used in cryptography is not a security mechanism. Anyone can convert the Base64 string back to its original bytes, so it should not be used as a means for protecting data, only as a format to display or store raw bytes more easily.

Certificates

x509 certificates in PEM format are base 64 encoded. 

The term Base64 refers to a specific MIME content transfer encoding. It is also used as a generic term for any similar encoding scheme that encodes binary data by treating it numerically and translating it into a base 64 representation. The particular choice of base is due to the history of character set encoding: one can choose a set of 64 characters that is both part of the subset common to most encodings, and also printable. This combination leaves the data unlikely to be modified in transit through systems, such as email, which were traditionally not 8-bit clean.

Base64 can be used in a variety of contexts:

  • Evolution and Thunderbird use Base64 to obfuscate e-mail passwords[1]
  • Base64 can be used to transmit and store text that might otherwise cause delimiter collision
  • Base64 is often used as a quick but insecure shortcut to obscure secrets without incurring the overhead of cryptographic key management

  • Spammers use Base64 to evade basic anti-spamming tools, which often do not decode Base64 and therefore cannot detect keywords in encoded messages.

  • Base64 is used to encode character strings in LDIF files
  • Base64 is sometimes used to embed binary data in an XML file, using a syntax similar to ...... e.g. Firefox's bookmarks.html.
  • Base64 is also used when communicating with government Fiscal Signature printing devices (usually, over serial or parallel ports) to minimize the delay when transferring receipt characters for signing.
  • Base64 is used to encode binary files such as images within scripts, to avoid depending on external files.
  • Can be used to embed raw image data into a CSS property such as background-image.
  • Base64 is a generic term for a number of similar encoding schemes that encode binary data by treating it numerically and translating it into a base 64 representation. The Base64 term originates from a specific MIME content transfer encoding.

    Base64 encoding schemes are commonly used when there is a need to encode binary data that needs be stored and transferred over media that are designed to deal with textual data. This is to ensure that the data remains intact without modification during transport. Base64 is used commonly in a number of applications including email via MIME, and storing complex data in XML.

    Why do we use Base64?

    Your first mistake is thinking that ASCII encoding and Base64 encoding are interchangeable. They are not. They are used for different purposes.

    • When you encode text in ASCII, you start with a text string and convert it to a sequence of bytes.
    • When you encode data in Base64, you start with a sequence of bytes and convert it to a text string.

    To understand why Base64 was necessary in the first place we need a little history of computing.


    Computers communicate in binary - 0s and 1s - but people typically want to communicate with more rich forms data such as text or images. In order to transfer this data between computers it first has to be encoded into 0s and 1s, sent, then decoded again. To take text as an example - there are many different ways to perform this encoding. It would be much simpler if we could all agree on a single encoding, but sadly this is not the case.

    Originally a lot of different encodings were created (e.g. Baudot code) which used a different number of bits per character until eventually ASCII became a standard with 7 bits per character. However most computers store binary data in bytes consisting of 8 bits each so ASCII is unsuitable for tranferring this type of data. Some systems would even wipe the most significant bit. Furthermore the difference in line ending encodings across systems mean that the ASCII character 10 and 13 were also sometimes modified.

    To solve these problems Base64 encoding was introduced. This allows you to encode aribtrary bytes to bytes which are known to be safe to send without getting corrupted (ASCII alphanumeric characters and a couple of symbols). The disadvantage is that encoding the message using Base64 increases its length - every 3 bytes of data is encoded to 4 ASCII characters.

    To send text reliably you can first encode to bytes using a text encoding of your choice (for example UTF-8) and then afterwards Base64 encode the resulting binary data into a text string that is safe to send encoded as ASCII. The receiver will have to reverse this process to recover the original message. This of course requires that the receiver knows which encodings were used, and this information often needs to be sent separately.

    Historically it has been used to encode binary data in email messages where the email server might modify line-endings. A more modern example is the use of Base64 encoding to embed image data directly in HTML source code. Here it is necessary to encode the data to avoid characters like '<' and '>' being interpreted as tags.

    What is the real purpose of Base64 encoding?

    Base64 is a way to encode binary data into an ASCII character set known to pretty much every computer system, in order to transmit the data without loss or modification of the contents itself. For example, mail systems cannot deal with binary data because they expect ASCII (textual) data. So if you want to transfer an image or another file, it will get corrupted because of the way it deals with the data.

    Note: base64 encoding is NOT a way of encrypting, nor a way of compacting data. In fact a base64 encoded piece of data is 1.333… times bigger than the original datapiece. It is only a way to be sure that no data is lost or modified during the transfer.

    How can you encode a string to Base64 in JavaScript?

    You can use btoa() and atob() to convert to and from base64 encoding.

    There appears to be some confusion in the comments regarding what these functions accept/return, so…

    • btoa() accepts a “string” where each character represents an 8-bit byte – if you pass a string containing characters that can’t be represented in 8 bits, it will probably break. This isn’t a problem if you’re actually treating the string as a byte array, but if you’re trying to do something else then you’ll have to encode it first.

    • atob() returns a “string” where each character represents an 8-bit byte – that is, its value will be between 0 and 0xff. This does not mean it’s ASCII – presumably if you’re using this function at all, you expect to be working with binary data and not text.

    How to do Base64 encoding in node.js?

    Buffers can be used for taking a string or piece of data and doing base64 encoding of the result. For example:

    > console.log(new Buffer("Hello World").toString('base64'));
    SGVsbG8gV29ybGQ=
    > console.log(new Buffer("SGVsbG8gV29ybGQ=", 'base64').toString('ascii'))
    Hello World

    Buffers are a global object, so no require is needed. Buffers created with strings can take an optional encoding parameter to specify what encoding the string is in. The available toString and Buffer constructor encodings are as follows:

    'ascii' - for 7 bit ASCII data only. This encoding method is very fast, and will strip the high bit if set.

    'utf8' - Multi byte encoded Unicode characters. Many web pages and other document formats use UTF-8.

    'ucs2' - 2-bytes, little endian encoded Unicode characters. It can encode only BMP(Basic Multilingual Plane, U+0000 - U+FFFF).

    'base64' - Base64 string encoding.

    'binary' - A way of encoding raw binary data into strings by using only the first 8 bits of each character. This encoding method is deprecated and should be avoided in favor of Buffer objects where possible. This encoding will be removed in future versions of Node.

    Embedding Base64 Images

    Data URIs are now supported by all major browsers. IE supports embedding images since version 8 as well.

    http://caniuse.com/#feat=datauri


    Data URIs are now supported by the following web browsers:

    • Gecko-based, such as Firefox, SeaMonkey, XeroBank, Camino, Fennec and K-Meleon
    • Konqueror, via KDE's KIO slaves input/output system
    • Opera (including devices such as the Nintendo DSi or Wii)
    • WebKit-based, such as Safari (including on iOS), Android's browser, Epiphany and Midori (WebKit is a derivative of Konqueror's KHTML engine, but Mac OS X does not share the KIO architecture so the implementations are different), as well as Webkit/Chromium-based, such as Chrome
    • Trident
      • Internet Explorer 8: Microsoft has limited its support to certain "non-navigable" content for security reasons, including concerns that JavaScript embedded in a data URI may not be interpretable by script filters such as those used by web-based email clients. Data URIs must be smaller than 32 KiB in Version 8[3].
      • Data URIs are supported only for the following elements and/or attributes[4]:
        • object (images only)
        • img
        • input type=image
        • link
      • CSS declarations that accept a URL, such as background-image, background, list-style-type, list-style and similar.
      • Internet Explorer 9: Internet Explorer 9 does not have 32KiB limitation and allowed in broader elements.
      • TheWorld Browser: An IE shell browser which has a built-in support for Data URI scheme

    http://en.wikipedia.org/wiki/Data_URI_scheme#Web_browser_support

    Is embedding background image data into CSS as Base64 good or bad practice?

    It's not a good idea when you want your images and style information to be cached separately. Also if you encode a large image or a significant number of images in to your css file it will take the browser longer to download the file leaving your site without any of the style information until the download completes. For small images that you don't intend on changing often if ever it is a fine solution.

    as far as generating the base64 encoding:

    • http://b64.io/
    • http://www.motobit.com/util/base64-decoder-encoder.asp (upload)
    • http://www.greywyvern.com/code/php/binary2base64 (from link with little tutorials underneath)

    Binary Data in JSON String. Something better than Base64

    There are 94 Unicode characters which can be represented as one byte according to the JSON spec (if your JSON is transmitted as UTF-8). With that in mind, I think the best you can do space-wise is base85 which represents four bytes as five characters. However, this is only a 7% improvement over base64, it's more expensive to compute, and implementations are less common than for base64 so it's probably not a win.

    You could also simply map every input byte to the corresponding character in U+0000-U+00FF, then do the minimum encoding required by the JSON standard to pass those characters; the advantage here is that the required decoding is nil beyond builtin functions, but the space efficiency is bad -- a 105% expansion (if all input bytes are equally likely) vs. 25% for base85 or 33% for base64.

    Final verdict: base64 wins, in my opinion, on the grounds that it's common, easy, and not bad enough to warrant replacement.

    I know this is a nearly 6 year old question but I run into the same problem, and thought I'd share a solution: multipart/form-data.

    By sending a multipart form you send first as string your JSON meta-data, and then separately send as raw binary (image(s), wavs, etc) indexed by the Content-Disposition name.

    Here's a nice tutorial on how to do this in obj-c, and here is a blog article that explains how to partition the string data with the form boundary, and separate it from the binary data.

    The only change you really need to do is on the server side; you will have to capture your meta-data which should reference the POST'ed binary data appropriately (by using a Content-Disposition boundary).

    Granted it requires additional work on the server side, but if you are sending many images or large images, this is worth it. Combine this with gzip compression if you want.

    IMHO sending base64 encoded data is a hack; the RFC multipart/form-data was created for issues such as this: sending binary data in combination with text or meta-data.

    The problem with UTF-8 is that it is not the most space efficient encoding. Also, some random binary byte sequences are invalid UTF-8 encoding. So you can't just interpret a random binary byte sequence as some UTF-8 data because it will be invalid UTF-8 encoding. The benefit of this constrain on the UTF-8 encoding is that it makes it robust and possible to locate multi byte chars start and end whatever byte we start looking at.

    As a consequence, if encoding a byte value in the range [0..127] would need only one byte in UTF-8 encoding, encoding a byte value in the range [128..255] would require 2 bytes ! Worse than that. In JSON, control chars, " and \ are not allowed to appear in a string. So the binary data would require some transformation to be properly encoded.

    Let see. If we assume uniformly distributed random byte values in our binary data then, on average, half of the bytes would be encoded in one bytes and the other half in two bytes. The UTF-8 encoded binary data would have 150% of the initial size.

    Base64 encoding grows only to 133% of the initial size. So Base64 encoding is more efficient.

    What about using another Base encoding ? In UTF-8, encoding the 128 ASCII values is the most space efficient. In 8 bits you can store 7 bits. So if we cut the binary data in 7 bit chunks to store them in each byte of an UTF-8 encoded string, the encoded data would grow only to 114% of the initial size. Better than Base64. Unfortunately we can't use this easy trick because JSON doesn't allow some ASCII chars. The 33 control characters of ASCII ( [0..31] and 127) and the " and \ must be excluded. This leaves us only 128-35 = 93 chars.

    So in theory we could define a Base93 encoding which would grow the encoded size to 8/log2(93) = 8*log10(2)/log10(93) = 122%. But a Base93 encoding would not be as convenient as a Base64 encoding. Base64 requires to cut the input byte sequence in 6bit chunks for which simple bitwise operation works well. Beside 133% is not much more than 122%.

    This is why I came independently to the common conclusion that Base64 is indeed the best choice to encode binary data in JSON. My answer presents a justification for it. I agree it isn't very attractive from the performance point of view, but consider also the benefit of using JSON with it's human readable string representation easy to manipulate in all programming languages.

    If performance is critical than a pure binary encoding should be considered as replacement of JSON. But with JSON my conclusion is that Base64 is the best.

    How to convert image into base64 string using javascript

    function toDataURL(url, callback) {
     var xhr = new XMLHttpRequest();
     xhr.onload = function() {
     var reader = new FileReader();
     reader.onloadend = function() {
     callback(reader.result);
     }
     reader.readAsDataURL(xhr.response);
     };
     xhr.open('GET', url);
     xhr.responseType = 'blob';
     xhr.send();
    }
    toDataURL('https://www.gravatar.com/avatar/d50c83cc0c6523b4d3f6085295c953e0', function(dataUrl) {
     console.log('RESULT:', dataUrl)
    })

    Get image data in JavaScript?

    Note: This only works if the image is from the same domain as the page, or has the crossOrigin="anonymous" attribute and the server supports CORS. It's also not going to give you the original file, but a re-encoded version. If you need the result to be identical to the original, see Kaiido's answer.


    You will need to create a canvas element with the correct dimensions and copy the image data with the drawImage function. Then you can use the toDataURL function to get a data: url that has the base-64 encoded image. Note that the image must be fully loaded, or you'll just get back an empty (black, transparent) image.

    It would be something like this. I've never written a Greasemonkey script, so you might need to adjust the code to run in that environment.

    function getBase64Image(img) {
     // Create an empty canvas element
     var canvas = document.createElement("canvas");
     canvas.width = img.width;
     canvas.height = img.height;
     // Copy the image contents to the canvas
     var ctx = canvas.getContext("2d");
     ctx.drawImage(img, 0, 0);
     // Get the data-URL formatted image
     // Firefox supports PNG and JPEG. You could check img.src to
     // guess the original format, but be aware the using "image/jpg"
     // will re-encode the image.
     var dataURL = canvas.toDataURL("image/png");
     return dataURL.replace(/^data:image\/(png|jpg);base64,/, "");
    }

    Getting a JPEG-formatted image doesn't work on older versions (around 3.5) of Firefox, so if you want to support that, you'll need to check the compatibility. If the encoding is not supported, it will default to "image/png".

    What is base64 ?

    Base64 is a group of similar binary-to-text encoding schemes that represent binary data in an ASCII string format by translating it into a radix-64 representation. The term Base64 originates from a specific MIME content transfer encoding.

    The particular set of 64 characters chosen to represent the 64 place-values for the base varies between implementations. The general strategy is to choose 64 characters that are both members of a subset common to most encodings, and also printable. This combination leaves the data unlikely to be modified in transit through information systems, such as email, that were traditionally not 8-bit clean. For example, MIME's Base64 implementation uses A–Z, a–z, and 0–9 for the first 62 values. Other variations share this property but differ in the symbols chosen for the last two values; an example is UTF-7.

    The earliest instances of this type of encoding were created for dialup communication between systems running the same OS — e.g., uuencode for UNIX, BinHex for the TRS-80 (later adapted for the Macintosh) — and could therefore make more assumptions about what characters were safe to use. For instance, uuencode uses uppercase letters, digits, and many punctuation characters, but no lowercase.

    The example below uses ASCII text for simplicity, but this is not a typical use case, as it can already be safely transferred across all systems that can handle Base64. The more typical use is to encode binary data (such as an image); the resulting Base64 data will only contain 64 different ASCII characters, all of which can reliably be transferred across systems that may corrupt the raw source bytes.

    A quote from Thomas Hobbes' Leviathan (be aware of spaces between lines):

    Man is distinguished, not only by his reason, but by this singular passion from other animals, which is a lust of the mind, that by a perseverance of delight in the continued and indefatigable generation of knowledge, exceeds the short vehemence of any carnal pleasure.

    is represented as a byte sequence of 8-bit-padded ASCII characters encoded in MIME's Base64 scheme as follows:

    TWFuIGlzIGRpc3Rpbmd1aXNoZWQsIG5vdCBvbmx5IGJ5IGhpcyByZWFzb24sIGJ1dCBieSB0aGlz IHNpbmd1bGFyIHBhc3Npb24gZnJvbSBvdGhlciBhbmltYWxzLCB3aGljaCBpcyBhIGx1c3Qgb2Yg dGhlIG1pbmQsIHRoYXQgYnkgYSBwZXJzZXZlcmFuY2Ugb2YgZGVsaWdodCBpbiB0aGUgY29udGlu dWVkIGFuZCBpbmRlZmF0aWdhYmxlIGdlbmVyYXRpb24gb2Yga25vd2xlZGdlLCBleGNlZWRzIHRo ZSBzaG9ydCB2ZWhlbWVuY2Ugb2YgYW55IGNhcm5hbCBwbGVhc3VyZS4=

    In the above quote, the encoded value of Man is TWFu. Encoded in ASCII, the characters M, a, and n are stored as the bytes 77, 97, and 110, which are the 8-bit binary values 01001101, 01100001, and 01101110. These three values are joined together into a 24-bit string, producing 010011010110000101101110. Groups of 6 bits (6 bits have a maximum of 26 = 64 different binary values) are converted into individual numbers from left to right (in this case, there are four numbers in a 24-bit string).

    What is base 64 encoding used for?

    When you have some binary data that you want to ship across a network, you generally don't do it by just streaming the bits and bytes over the wire in a raw format. Why? because some media are made for streaming text. You never know -- some protocols may interpret your binary data as control characters (like a modem), or your binary data could be screwed up because the underlying protocol might think that you've entered a special character combination (like how FTP translates line endings).

    So to get around this, people encode the binary data into characters. Base64 is one of these types of encodings.

    Why 64?

    Because you can generally rely on the same 64 characters being present in many character sets, and you can be reasonably confident that your data's going to end up on the other side of the wire uncorrupted.

    Aside from what's already been said, two very common uses that have not been listed are

    Hashes:

    Hashes are one-way functions that transform a block of bytes into another block of bytes of a fixed size such as 128bit or 256bit (SHA/MD5). Converting the resulting bytes into Base64 makes it much easier to display the hash especially when you are comparing a checksum for integrity. Hashes are so often seen in Base64 that many people mistake Base64 itself as a hash.

    Cryptography:

    Since an encryption key does not have to be text but raw bytes it is sometimes necessary to store it in a file or database, which Base64 comes in handy for. Same with the resulting encrypted bytes.

    Note that although Base64 is often used in cryptography is not a security mechanism. Anyone can convert the Base64 string back to its original bytes.

    The MIME (Multipurpose Internet Mail Extensions) specification lists Base64 as one of two binary-to-text encoding schemes (the other being quoted-printable). MIME's Base64 encoding is based on that of the RFC 1421 version of PEM: it uses the same 64-character alphabet and encoding mechanism as PEM, and uses the "=" symbol for output padding in the same way, as described at RFC 2045.

    MIME does not specify a fixed length for Base64-encoded lines, but it does specify a maximum line length of 76 characters. Additionally it specifies that any extra-alphabetic characters must be ignored by a compliant decoder, although most implementations use a CR/LF newline pair to delimit encoded lines.

    Thus, the actual length of MIME-compliant Base64-encoded binary data is usually about 137% of the original data length, though for very short messages the overhead can be much higher due to the overhead of the headers. Very roughly, the final size of Base64-encoded binary data is equal to 1.37 times the original data size + 814 bytes (for headers). The size of the decoded data can be approximated.

    Base64 encoding can be helpful when fairly lengthy identifying information is used in an HTTP environment. For example, a database persistence framework for Java objects might use Base64 encoding to encode a relatively large unique id (generally 128-bit UUIDs) into a string for use as an HTTP parameter in HTTP forms or HTTP GET URLs. Also, many applications need to encode binary data in a way that is convenient for inclusion in URLs, including in hidden web form fields, and Base64 is a convenient encoding to render them in a compact way.

    What is the real purpose of Base64 encoding?

    Base64 is a way to encode binary data into an ASCII character set known to pretty much every computer system, in order to transmit the data without loss or modification of the contents itself. For example, mail systems cannot deal with binary data because they expect ASCII (textual) data. So if you want to transfer an image or another file, it will get corrupted because of the way it deals with the data.

    Note: base64 encoding is NOT a way of encrypting, nor a way of compacting data. In fact a base64 encoded piece of data is 1.333… times bigger than the original datapiece. It is only a way to be sure that no data is lost or modified during the transfer.

    Why do we use Base64?

    Your first mistake is thinking that ASCII encoding and Base64 encoding are interchangeable. They are not. They are used for different purposes.

    When you encode text in ASCII, you start with a text string and convert it to a sequence of bytes. When you encode data in Base64, you start with a sequence of bytes and convert it to a text string. To understand why Base64 was necessary in the first place we need a little history of computing.

    Computers communicate in binary - 0s and 1s - but people typically want to communicate with more rich forms data such as text or images. In order to transfer this data between computers it first has to be encoded into 0s and 1s, sent, then decoded again. To take text as an example - there are many different ways to perform this encoding. It would be much simpler if we could all agree on a single encoding, but sadly this is not the case.

    Originally a lot of different encodings were created (e.g. Baudot code) which used a different number of bits per character until eventually ASCII became a standard with 7 bits per character. However most computers store binary data in bytes consisting of 8 bits each so ASCII is unsuitable for tranferring this type of data. Some systems would even wipe the most significant bit. Furthermore the difference in line ending encodings across systems mean that the ASCII character 10 and 13 were also sometimes modified.

    To solve these problems Base64 encoding was introduced. This allows you to encode aribtrary bytes to bytes which are known to be safe to send without getting corrupted (ASCII alphanumeric characters and a couple of symbols). The disadvantage is that encoding the message using Base64 increases its length - every 3 bytes of data is encoded to 4 ASCII characters.

    To send text reliably you can first encode to bytes using a text encoding of your choice (for example UTF-8) and then afterwards Base64 encode the resulting binary data into a text string that is safe to send encoded as ASCII. The receiver will have to reverse this process to recover the original message. This of course requires that the receiver knows which encodings were used, and this information often needs to be sent separately.

    Historically it has been used to encode binary data in email messages where the email server might modify line-endings. A more modern example is the use of Base64 encoding to embed image data directly in HTML source code. Here it is necessary to encode the data to avoid characters like '<' and '>' being interpreted as tags.

    What is base 64 encoding used for?

    When you have some binary data that you want to ship across a network, you generally don't do it by just streaming the bits and bytes over the wire in a raw format. Why? because some media are made for streaming text. You never know -- some protocols may interpret your binary data as control characters (like a modem), or your binary data could be screwed up because the underlying protocol might think that you've entered a special character combination (like how FTP translates line endings).

    So to get around this, people encode the binary data into characters. Base64 is one of these types of encodings.

    Why 64?
    Because you can generally rely on the same 64 characters being present in many character sets, and you can be reasonably confident that your data's going to end up on the other side of the wire uncorrupted.

    It's basically a way of encoding arbitrary binary data in ASCII text. It takes 4 characters per 3 bytes of data, plus potentially a bit of padding at the end.

    Essentially each 6 bits of the input is encoded in a 64-character alphabet. The "standard" alphabet uses A-Z, a-z, 0-9 and + and /, with = as a padding character. There are URL-safe variants.

    Wikipedia is a reasonably good source of more information.

    It's a textual encoding of binary data where the resultant text has nothing but letters, numbers and the symbols "+", "/" and "=". It's a convenient way to store/transmit binary data over media that is specifically used for textual data.

    But why Base-64? The two alternatives for converting binary data into text that immediately spring to mind are:

    1. Decimal: store the decimal value of each byte as three numbers: 045 112 101 037 etc. where each byte is represented by 3 bytes. The data bloats three-fold.
    2. Hexadecimal: store the bytes as hex pairs: AC 47 0D 1A etc. where each byte is represented by 2 bytes. The data bloats two-fold.

    Base-64 maps 3 bytes (8 x 3 = 24 bits) in 4 characters that span 6-bits (6 x 4 = 24 bits). The result looks something like "TWFuIGlzIGRpc3Rpb...". Therefore the bloating is only a mere 4/3 = 1.3333333 times the original.

    Aside from what's already been said, two very common uses that have not been listed are

    Hashes:

    Hashes are one-way functions that transform a block of bytes into another block of bytes of a fixed size such as 128bit or 256bit (SHA/MD5). Converting the resulting bytes into Base64 makes it much easier to display the hash especially when you are comparing a checksum for integrity. Hashes are so often seen in Base64 that many people mistake Base64 itself as a hash.

    Cryptography:

    Since an encryption key does not have to be text but raw bytes it is sometimes necessary to store it in a file or database, which Base64 comes in handy for. Same with the resulting encrypted bytes.

    Note that although Base64 is often used in cryptography is not a security mechanism. Anyone can convert the Base64 string back to its original bytes, so it should not be used as a means for protecting data, only as a format to display or store raw bytes more easily.

    Certificates

    x509 certificates in PEM format are base 64 encoded. 

    The term Base64 refers to a specific MIME content transfer encoding. It is also used as a generic term for any similar encoding scheme that encodes binary data by treating it numerically and translating it into a base 64 representation. The particular choice of base is due to the history of character set encoding: one can choose a set of 64 characters that is both part of the subset common to most encodings, and also printable. This combination leaves the data unlikely to be modified in transit through systems, such as email, which were traditionally not 8-bit clean.

    Base64 can be used in a variety of contexts:

    • Evolution and Thunderbird use Base64 to obfuscate e-mail passwords[1]
    • Base64 can be used to transmit and store text that might otherwise cause delimiter collision
    • Base64 is often used as a quick but insecure shortcut to obscure secrets without incurring the overhead of cryptographic key management

    • Spammers use Base64 to evade basic anti-spamming tools, which often do not decode Base64 and therefore cannot detect keywords in encoded messages.

  • Base64 is used to encode character strings in LDIF files
  • Base64 is sometimes used to embed binary data in an XML file, using a syntax similar to ...... e.g. Firefox's bookmarks.html.
  • Base64 is also used when communicating with government Fiscal Signature printing devices (usually, over serial or parallel ports) to minimize the delay when transferring receipt characters for signing.
  • Base64 is used to encode binary files such as images within scripts, to avoid depending on external files.
  • Can be used to embed raw image data into a CSS property such as background-image.
  • Base64 is a generic term for a number of similar encoding schemes that encode binary data by treating it numerically and translating it into a base 64 representation. The Base64 term originates from a specific MIME content transfer encoding.

    Base64 encoding schemes are commonly used when there is a need to encode binary data that needs be stored and transferred over media that are designed to deal with textual data. This is to ensure that the data remains intact without modification during transport. Base64 is used commonly in a number of applications including email via MIME, and storing complex data in XML.

    Why do we use Base64?

    Your first mistake is thinking that ASCII encoding and Base64 encoding are interchangeable. They are not. They are used for different purposes.

    • When you encode text in ASCII, you start with a text string and convert it to a sequence of bytes.
    • When you encode data in Base64, you start with a sequence of bytes and convert it to a text string.

    To understand why Base64 was necessary in the first place we need a little history of computing.


    Computers communicate in binary - 0s and 1s - but people typically want to communicate with more rich forms data such as text or images. In order to transfer this data between computers it first has to be encoded into 0s and 1s, sent, then decoded again. To take text as an example - there are many different ways to perform this encoding. It would be much simpler if we could all agree on a single encoding, but sadly this is not the case.

    Originally a lot of different encodings were created (e.g. Baudot code) which used a different number of bits per character until eventually ASCII became a standard with 7 bits per character. However most computers store binary data in bytes consisting of 8 bits each so ASCII is unsuitable for tranferring this type of data. Some systems would even wipe the most significant bit. Furthermore the difference in line ending encodings across systems mean that the ASCII character 10 and 13 were also sometimes modified.

    To solve these problems Base64 encoding was introduced. This allows you to encode aribtrary bytes to bytes which are known to be safe to send without getting corrupted (ASCII alphanumeric characters and a couple of symbols). The disadvantage is that encoding the message using Base64 increases its length - every 3 bytes of data is encoded to 4 ASCII characters.

    To send text reliably you can first encode to bytes using a text encoding of your choice (for example UTF-8) and then afterwards Base64 encode the resulting binary data into a text string that is safe to send encoded as ASCII. The receiver will have to reverse this process to recover the original message. This of course requires that the receiver knows which encodings were used, and this information often needs to be sent separately.

    Historically it has been used to encode binary data in email messages where the email server might modify line-endings. A more modern example is the use of Base64 encoding to embed image data directly in HTML source code. Here it is necessary to encode the data to avoid characters like '<' and '>' being interpreted as tags.

    What is the real purpose of Base64 encoding?

    Base64 is a way to encode binary data into an ASCII character set known to pretty much every computer system, in order to transmit the data without loss or modification of the contents itself. For example, mail systems cannot deal with binary data because they expect ASCII (textual) data. So if you want to transfer an image or another file, it will get corrupted because of the way it deals with the data.

    Note: base64 encoding is NOT a way of encrypting, nor a way of compacting data. In fact a base64 encoded piece of data is 1.333… times bigger than the original datapiece. It is only a way to be sure that no data is lost or modified during the transfer.

    How can you encode a string to Base64 in JavaScript?

    You can use btoa() and atob() to convert to and from base64 encoding.

    There appears to be some confusion in the comments regarding what these functions accept/return, so…

    • btoa() accepts a “string” where each character represents an 8-bit byte – if you pass a string containing characters that can’t be represented in 8 bits, it will probably break. This isn’t a problem if you’re actually treating the string as a byte array, but if you’re trying to do something else then you’ll have to encode it first.

    • atob() returns a “string” where each character represents an 8-bit byte – that is, its value will be between 0 and 0xff. This does not mean it’s ASCII – presumably if you’re using this function at all, you expect to be working with binary data and not text.

    How to do Base64 encoding in node.js?

    Buffers can be used for taking a string or piece of data and doing base64 encoding of the result. For example:

    > console.log(new Buffer("Hello World").toString('base64'));
    SGVsbG8gV29ybGQ=
    > console.log(new Buffer("SGVsbG8gV29ybGQ=", 'base64').toString('ascii'))
    Hello World

    Buffers are a global object, so no require is needed. Buffers created with strings can take an optional encoding parameter to specify what encoding the string is in. The available toString and Buffer constructor encodings are as follows:

    'ascii' - for 7 bit ASCII data only. This encoding method is very fast, and will strip the high bit if set.

    'utf8' - Multi byte encoded Unicode characters. Many web pages and other document formats use UTF-8.

    'ucs2' - 2-bytes, little endian encoded Unicode characters. It can encode only BMP(Basic Multilingual Plane, U+0000 - U+FFFF).

    'base64' - Base64 string encoding.

    'binary' - A way of encoding raw binary data into strings by using only the first 8 bits of each character. This encoding method is deprecated and should be avoided in favor of Buffer objects where possible. This encoding will be removed in future versions of Node.

    Embedding Base64 Images

    Data URIs are now supported by all major browsers. IE supports embedding images since version 8 as well.

    http://caniuse.com/#feat=datauri


    Data URIs are now supported by the following web browsers:

    • Gecko-based, such as Firefox, SeaMonkey, XeroBank, Camino, Fennec and K-Meleon
    • Konqueror, via KDE's KIO slaves input/output system
    • Opera (including devices such as the Nintendo DSi or Wii)
    • WebKit-based, such as Safari (including on iOS), Android's browser, Epiphany and Midori (WebKit is a derivative of Konqueror's KHTML engine, but Mac OS X does not share the KIO architecture so the implementations are different), as well as Webkit/Chromium-based, such as Chrome
    • Trident
      • Internet Explorer 8: Microsoft has limited its support to certain "non-navigable" content for security reasons, including concerns that JavaScript embedded in a data URI may not be interpretable by script filters such as those used by web-based email clients. Data URIs must be smaller than 32 KiB in Version 8[3].
      • Data URIs are supported only for the following elements and/or attributes[4]:
        • object (images only)
        • img
        • input type=image
        • link
      • CSS declarations that accept a URL, such as background-image, background, list-style-type, list-style and similar.
      • Internet Explorer 9: Internet Explorer 9 does not have 32KiB limitation and allowed in broader elements.
      • TheWorld Browser: An IE shell browser which has a built-in support for Data URI scheme

    http://en.wikipedia.org/wiki/Data_URI_scheme#Web_browser_support

    Is embedding background image data into CSS as Base64 good or bad practice?

    It's not a good idea when you want your images and style information to be cached separately. Also if you encode a large image or a significant number of images in to your css file it will take the browser longer to download the file leaving your site without any of the style information until the download completes. For small images that you don't intend on changing often if ever it is a fine solution.

    as far as generating the base64 encoding:

    • http://b64.io/
    • http://www.motobit.com/util/base64-decoder-encoder.asp (upload)
    • http://www.greywyvern.com/code/php/binary2base64 (from link with little tutorials underneath)

    Binary Data in JSON String. Something better than Base64

    There are 94 Unicode characters which can be represented as one byte according to the JSON spec (if your JSON is transmitted as UTF-8). With that in mind, I think the best you can do space-wise is base85 which represents four bytes as five characters. However, this is only a 7% improvement over base64, it's more expensive to compute, and implementations are less common than for base64 so it's probably not a win.

    You could also simply map every input byte to the corresponding character in U+0000-U+00FF, then do the minimum encoding required by the JSON standard to pass those characters; the advantage here is that the required decoding is nil beyond builtin functions, but the space efficiency is bad -- a 105% expansion (if all input bytes are equally likely) vs. 25% for base85 or 33% for base64.

    Final verdict: base64 wins, in my opinion, on the grounds that it's common, easy, and not bad enough to warrant replacement.

    I know this is a nearly 6 year old question but I run into the same problem, and thought I'd share a solution: multipart/form-data.

    By sending a multipart form you send first as string your JSON meta-data, and then separately send as raw binary (image(s), wavs, etc) indexed by the Content-Disposition name.

    Here's a nice tutorial on how to do this in obj-c, and here is a blog article that explains how to partition the string data with the form boundary, and separate it from the binary data.

    The only change you really need to do is on the server side; you will have to capture your meta-data which should reference the POST'ed binary data appropriately (by using a Content-Disposition boundary).

    Granted it requires additional work on the server side, but if you are sending many images or large images, this is worth it. Combine this with gzip compression if you want.

    IMHO sending base64 encoded data is a hack; the RFC multipart/form-data was created for issues such as this: sending binary data in combination with text or meta-data.

    The problem with UTF-8 is that it is not the most space efficient encoding. Also, some random binary byte sequences are invalid UTF-8 encoding. So you can't just interpret a random binary byte sequence as some UTF-8 data because it will be invalid UTF-8 encoding. The benefit of this constrain on the UTF-8 encoding is that it makes it robust and possible to locate multi byte chars start and end whatever byte we start looking at.

    As a consequence, if encoding a byte value in the range [0..127] would need only one byte in UTF-8 encoding, encoding a byte value in the range [128..255] would require 2 bytes ! Worse than that. In JSON, control chars, " and \ are not allowed to appear in a string. So the binary data would require some transformation to be properly encoded.

    Let see. If we assume uniformly distributed random byte values in our binary data then, on average, half of the bytes would be encoded in one bytes and the other half in two bytes. The UTF-8 encoded binary data would have 150% of the initial size.

    Base64 encoding grows only to 133% of the initial size. So Base64 encoding is more efficient.

    What about using another Base encoding ? In UTF-8, encoding the 128 ASCII values is the most space efficient. In 8 bits you can store 7 bits. So if we cut the binary data in 7 bit chunks to store them in each byte of an UTF-8 encoded string, the encoded data would grow only to 114% of the initial size. Better than Base64. Unfortunately we can't use this easy trick because JSON doesn't allow some ASCII chars. The 33 control characters of ASCII ( [0..31] and 127) and the " and \ must be excluded. This leaves us only 128-35 = 93 chars.

    So in theory we could define a Base93 encoding which would grow the encoded size to 8/log2(93) = 8*log10(2)/log10(93) = 122%. But a Base93 encoding would not be as convenient as a Base64 encoding. Base64 requires to cut the input byte sequence in 6bit chunks for which simple bitwise operation works well. Beside 133% is not much more than 122%.

    This is why I came independently to the common conclusion that Base64 is indeed the best choice to encode binary data in JSON. My answer presents a justification for it. I agree it isn't very attractive from the performance point of view, but consider also the benefit of using JSON with it's human readable string representation easy to manipulate in all programming languages.

    If performance is critical than a pure binary encoding should be considered as replacement of JSON. But with JSON my conclusion is that Base64 is the best.

    How to convert image into base64 string using javascript

    function toDataURL(url, callback) {
     var xhr = new XMLHttpRequest();
     xhr.onload = function() {
     var reader = new FileReader();
     reader.onloadend = function() {
     callback(reader.result);
     }
     reader.readAsDataURL(xhr.response);
     };
     xhr.open('GET', url);
     xhr.responseType = 'blob';
     xhr.send();
    }
    toDataURL('https://www.gravatar.com/avatar/d50c83cc0c6523b4d3f6085295c953e0', function(dataUrl) {
     console.log('RESULT:', dataUrl)
    })

    Get image data in JavaScript?

    Note: This only works if the image is from the same domain as the page, or has the crossOrigin="anonymous" attribute and the server supports CORS. It's also not going to give you the original file, but a re-encoded version. If you need the result to be identical to the original, see Kaiido's answer.


    You will need to create a canvas element with the correct dimensions and copy the image data with the drawImage function. Then you can use the toDataURL function to get a data: url that has the base-64 encoded image. Note that the image must be fully loaded, or you'll just get back an empty (black, transparent) image.

    It would be something like this. I've never written a Greasemonkey script, so you might need to adjust the code to run in that environment.

    function getBase64Image(img) {
     // Create an empty canvas element
     var canvas = document.createElement("canvas");
     canvas.width = img.width;
     canvas.height = img.height;
     // Copy the image contents to the canvas
     var ctx = canvas.getContext("2d");
     ctx.drawImage(img, 0, 0);
     // Get the data-URL formatted image
     // Firefox supports PNG and JPEG. You could check img.src to
     // guess the original format, but be aware the using "image/jpg"
     // will re-encode the image.
     var dataURL = canvas.toDataURL("image/png");
     return dataURL.replace(/^data:image\/(png|jpg);base64,/, "");
    }

    Getting a JPEG-formatted image doesn't work on older versions (around 3.5) of Firefox, so if you want to support that, you'll need to check the compatibility. If the encoding is not supported, it will default to "image/png".

    Credit: wikipedia

    base64 decode and encode - online

    base64 decode and encode - online

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    base64 - wikipedia

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    18 12 base64 8212 rfc 3548 base16 base32 base64 data

    18 12 base64 8212 rfc 3548 base16 base32 base64 data

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    base64 java platform se 8 - oracle help center

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    base64 online - base64 decode and encode - motobit com

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    base64 android developers

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    base64 - the go programming language

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    module base64 ruby 2 1 3 - ruby-doc org

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    rfc 4648 - the base16 base32 and base64 data encodings

    rfc 4648 - the base16 base32 and base64 data encodings

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    base64 apache commons codec 1 10 api

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    github - mathiasbynens base64 a robust base64 encoder decoder

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    base64 public domain base64 encoder decoder - iharder net

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    base64 - cargo packages for rust - crates io

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    base64 encoding and decoding - web apis mdn

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    base64 - atom

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    std base64 - d programming language

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    encodes data with mime base64 - php net

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    erlang -- base64

    erlang -- base64

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    base64 - github com crystal-lang crystal

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    how base64 encoding works - lifewire

    how base64 encoding works - lifewire

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    base64 encode and decode base64 files - fourmilab

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    free online html formatter - freeformatter com

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    algorithm implementation miscellaneous base64 - wikibooks open

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    base64 to decimal cryptii

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    base64 1 - linux man page - linux die - die net

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    base64 encoder decoder online

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    ionic native - base64

    ionic native - base64

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    base64 cipher - rumkin com

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    cran - package base64

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    base64 encoding glib reference manual

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    base64 - npm

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    base64 - hash amp encryption - unit conversion

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    base64 splunkbase

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    base64 package atmosphere

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    base64 constant - dart convert library - dart api

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    base64 encoder - opinionatedgeek

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    fn base64 - aws cloudformation - aws documentation

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    client secret stored without base64 encoding - auth0 discourse

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    base64 - apple developer

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    base64 b64 8212 wolfram language documentation

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    ubuntu manpage base64 - base64 encode decode data and print

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    base64 - godoc

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    base64 codename one api

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    go by example base64 encoding

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    mobilefish com - base64 encoder and decoder

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    base64 encoding google cloud vision api documentation

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    expansion - base64 what is the worst possible increase in space

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    base64 encode and decode online tool samltool com

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    module base64

    module base64

    in order to encode some text simply call the encode procedure import base64 let encoded encode quot hello world quot echo encoded sgvsbg8gv29ybgq

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    tomasz ostrowski - base64 decoder - tomasz ostrowski homepage

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    base64 - elm-base64 1 0 5 - elm packages

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    reference for unit base64 - free pascal

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    base64 encoding amp performance part 1 what s up with base64

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    mime base64 - search cpan org

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    base64 encoding in java 8 - dzone java

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    lua-users wiki base sixty four

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    base64 on cocoapods org

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    base64 - cdnjs com - the best foss cdn for web related libraries

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    18 11 base64 8212 rfc 3548 base16 base32 base64 data - jython

    18 11 base64 8212 rfc 3548 base16 base32 base64 data - jython

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    convert image base64 encoder - askapache

    convert image base64 encoder - askapache

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    base64 file encoder - jaime pillora jpillora

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    man page for base64 - chiark

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    when to base64 encode images and when not to david calhoun

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    base64 - tcl tk

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    base64 encoding options on the mac and iphone - cocoa with love

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    base64 1 - linux manual page - man7 org

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    base64 and base32 alphabets - garykessler net

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    base64 can get you pwned - sans institute

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    convert frombase64string method string system

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    haxe crypto base64 - haxe api

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    mime base64 - perldoc perl org

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    encode and decode text in base64 - dan s tools

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    how does base64 work - youtube

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    base64 function r documentation

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    base64 - freebsd

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    base64 versus plaintext observations - trustwave

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    1 base64

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    cryptool-online codings base64

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    dojox encoding base64 8212 the dojo toolkit - reference guide

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    maven repository base64 libraries

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    base64 encode decode - online toolz

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    goog crypt base64 - google

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    pens tagged base64 on codepen

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    base64-encode function - progress software documentation

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    base64 - opensslwiki

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    what is base64 - definition from techopedia

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    base64 and url encoding and decoding - ostermiller org

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    the base64 module - effbot org

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    base64 8211 the security killer - rsa conference

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    what is base64 benefits - inchoo

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    fusejs base64 module js - docs - fuse

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    free base64 component - xstandard

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    base64 jboss seam api documentation - jboss org documentation

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    base64 - wwwendt

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    base64 - apidock

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    can i upload using data uri base64 8211 cloudinary support

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    base64 jetbrains plugin repository

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    base64 8211 encode binary data into ascii characters - python module

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    javascript base64 - javascript tutorial with example source code

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    base64 - itext software

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    base64 wowza streaming engine 4 api

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    quot response does not include base64 encoded policy quot error 8211 adobe

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    decoding base64 in abap - code gallery - scn wiki

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    base64 converter - miracle salad

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    xdmp base64-encode 8212 marklogic 9 product documentation

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    file- gt base64 kirby

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    base64 image ckeditor com

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    can i insert images as base64 8211 froala

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    base64 postgresql jdbc driver - jdbc 4 2 9 4 1208 api

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    bash - how can i decode a base64 string from the command line

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    base64 encoding of text for post request - answered

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    ascii text hex binary decimal base64 converter - rapidtables

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    quot base64 quot command usage examples in linux - sanfoundry

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    base64 encoding and decoding using python - code tuts - tuts

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    base64 encoder java platform jdk 9 build 173

    this class implements an encoder for encoding byte data using the base64 encoding scheme as specified in rfc 4648 and rfc 2045 instances of base64

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    base64 esapi 2 0 1 api - javadoc io

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    base64 - emacs mime manual - gnu org

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    convert base64 encoded data - hci data ltd

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    available lua libraries 8212 splash 3 0 documentation - read the docs

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    groovy goodness base64 encoding - messages from mrhaki

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    base64 struct reference juce

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    base64 base64 public domain encoder decoder - iharder net

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    module base64 - documentation for ruby 2 4 0 - doc ruby-lang org

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    vscode-base64 - visual studio marketplace

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    how to base64 encode a string in nativescript - tips and tutorials

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    base64 source code encoding decoding - mbed tls

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    macos - os x base64 encode via command line - super user

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    base64 decoder - sans internet storm center

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    base64encoder - adobe actionscript 3 as3 flex api reference

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    base64 encoding decoding

    base64 encoding decoding

    type in the message you want to encode in base64 or paste base64 encoded text into the text field select encode or decode and click the button

    image to base64 converter - encode images to base64 - online

    image to base64 converter - encode images to base64 - online

    useful free online tool that converts images to base64 no ads nonsense or garbage just an image to base64 converter press button get result

    base64 encode - online base64 encoder - convert string

    base64 encode - online base64 encoder - convert string

    base64 encode online tool for base64 encoding a string convert text into a base64 encoded string using this free online base64 encoder utility

    botan src lib codec base64 base64 h source file

    botan src lib codec base64 base64 h source file

    17 perform base64 encoding 18 param output an array of at least base64 encode max output bytes 19 param input is some binary data

    encode decode base64 - webatic

    encode decode base64 - webatic

    help for encode decode base64 base64 is a protocol that maps any binary content to readable characters to encode a regular text to base64 type in the box

    io netty handler codec base64

    io netty handler codec base64

    encoder and decoder which transform a base64-encoded string or bytebuf utility class for bytebuf that encodes and decodes to and from base64 notation

    base64 encoding decoding in node js - hacksparrow

    base64 encoding decoding in node js - hacksparrow

    ow do you encode a string to base64 is node js is there something easy like base64 encode of php s node js being javascript has

    base64 eclipse plugins bundles and products - eclipse marketplace

    base64 eclipse plugins bundles and products - eclipse marketplace

    developer utils md5 sha url encoder amp decoder regex base64 utils socket server amp client devutilsplugin - http kangtae49 github io dev-utils-plugin update

    java base64 encoding and decoding baeldung

    java base64 encoding and decoding baeldung

    his tutorial we re going to explore the various utilities that provide base64 encoding and decoding functionality in java we re mainly going

    integration agent will not start due to quot base64 quot exception 8211 xmatters

    integration agent will not start due to quot base64 quot exception 8211 xmatters

    ious integration agents used earlier versions of java which did not include this class and therefore had to explicitly import base64 from

    base64-encoded certificates - ibm

    base64-encoded certificates - ibm

    the binary certificate and the pkcs 7 and 12 binary packages can be additionally encoded using the base64 algorithm base64 encoding is a mechanism to

    base64 32534 30721 35299 30721 - 22312 32447 24037 20855 - 24320 28304 20013 22269

    base64 32534 30721 35299 30721 - 22312 32447 24037 20855 - 24320 28304 20013 22269

    24320 28304 20013 22269 22312 32447 24037 20855 ostools 20026 24320 21457 35774 35745 20154 21592 25552 20379 22312 32447 24037 20855 65292 25552 20379 jsbin 22312 32447 css 12289 js 35843 35797 65292 22312 32447 java api 25991 26723 22312 32447 php api 25991 26723 22312 32447 node js api 25991 26723 less css 32534 35793 22120

    base64 fold - packages - package control

    base64 fold - packages - package control

    base64 fold by daquirm st2 st3 a sublime text plug-in that automatically folds base64-encoded data uris in your css files

    base64 - ruby on rails api

    base64 - ruby on rails api

    encodes a string to its base 64 representation each 60 characters of output is separated by a newline character activesupport base64 encode64 quot original

    base64 nse library - nmap

    base64 nse library - nmap

    copyright the mit license mit copyright c 2016 patrick joseph donnelly batrick batbytes com source https svn nmap org nmap nselib base64 lua

    labview utility vis for base64 and base32hex encoding - discussion

    labview utility vis for base64 and base32hex encoding - discussion

    e vis can be used to convert encode and decode strings between ascii base64 and base32hex encoding base64 encoding is

    blobs in base64 - genexus community wiki

    blobs in base64 - genexus community wiki

    the following functions have been implemented in genexus x to get and set a blob file content in base64 tobase64string returns blob file content in

    base64 - apigee community

    base64 - apigee community

    does jsonthreatprotection amp regex policy work for base64 encoded payload feb 13 17 in how-to convert pdf binary stream to base64 string in apigee

    javascript base64 encode and decode - jsfiddle

    javascript base64 encode and decode - jsfiddle

    input base64 utf8 encode input 13 14 while i lt input length 15 16 chr1 input charcodeat i 17 chr2 input charcodeat i 18

    file formats base64 - chemaxon

    file formats base64 - chemaxon

    chemaxon products are is able to import and export base64 encoded files rfc 1341 a binary file is encoded as a multi line ascii file containing the

    base64 encoder decoder in visual basic vbasic vb vba

    base64 encoder decoder in visual basic vbasic vb vba

    base64 encoder decoder in visual basic base64coder is a fast and compact base64 encoder decoder module source code base64coder bas test program

    simple base64 encode amp decode on mac osx linux with

    simple base64 encode amp decode on mac osx linux with

    ng for a fast and convenient way to base64 encode decode a given string using your mac or linux machine you can do it using the

    base64 translator - stackoverflow org

    base64 translator - stackoverflow org

    8592 return to stackoverflow org base64 translator use this button for decoding the headers of pgp sigs and keys

    base64 - tibco docs

    base64 - tibco docs

    class base64 java lang object com tibco sdk tools base64 public class base64 extends java lang object constructor summary constructors constructor and

    redleg s decoder base64 and escape - aw-snap info

    redleg s decoder base64 and escape - aw-snap info

    on line tool to decode base64 encoded strings eval base64 decode eval gzinflate base64 decode eval gzuncompress base64 decode

    caching page base64 image in html vs image as attachment

    caching page base64 image in html vs image as attachment

    ground we want to build a page that will use dynamic serving different version for desktop tablet and mobile currently we think which of

    base64 encode and decode - etellicom

    base64 encode and decode - etellicom

    free - encode and decode base64 strings online base64 encode or decode just enter the string you want to encode or decode into the text field below and

    online base64 decoder coder s toolbox

    online base64 decoder coder s toolbox

    encode and decode strings base64 url xml javascript

    base64 - rise4fun

    base64 - rise4fun

    the tutorial shows how base64 encoding and decoding routines can be implemented and analyzed in bek the bek programs use local function definitions

    renderbase64 phantomjs

    renderbase64 phantomjs

    renderbase64 renderbase64 format renders the web page to an image buffer and returns the result as a base64-encoded string representation of that image

    askf5 manual chapter securing base64-encoded parameters

    askf5 manual chapter securing base64-encoded parameters

    base64 encoding is a convenient encoding method that uses a compact presentation and is relatively unreadable to the casual observer many applications

    binary image file to base64 encoder translator - greywyvern

    binary image file to base64 encoder translator - greywyvern

    binary file to base64 encoder translator use this tool to create data streams for embedding images or any type of file in x html css and xml encode file

    base64 encode images - help with expo - expo forums

    base64 encode images - help with expo - expo forums

    o is there a way i can base64 encode an image cameraroll and or web image without the need to use expokit and detach the project

    encode decode to from base64 - real s java how-to

    encode decode to from base64 - real s java how-to

    as seen in this howto the sun misc base64encoder decoder or creating your own base64 handling are common ways to deal with base64

    ext util base64 encode decode - sencha

    ext util base64 encode decode - sencha

    there were so many base64 versions around but i haven t found an ext-classed version of this so here it is call it with var myencodedstring

    how to decode base64 file when sending as an attachment in email

    how to decode base64 file when sending as an attachment in email

    hat i am encoding the attachment to base64 purpose of data loss and sending an email now the mail has been sent with attachment but

    solving b-64-b-tuff writing base64 and alphanumeric shellcode

    solving b-64-b-tuff writing base64 and alphanumeric shellcode

    challenge was to write base64-compatible shellcode there s an easy solution - using an alphanumeric encoder - but what s the fun in that

    base64 encoder decoder - commad line utility

    base64 encoder decoder - commad line utility

    base64 is the simple command line windows used to encode and decode files in the 8220 base64 8221 format this code is spin-off of binary viewer - much larger

    how to encode and decode strings with base64 in javascript

    how to encode and decode strings with base64 in javascript

    ding and decoding a string in base64 with javascript can be quite handy it s in no way meant to be a secure encryption method but it is

    base64 encoding images for faster pages performance and seo

    base64 encoding images for faster pages performance and seo

    64 encoding images reduces the amount of things your webpage has to download to render

    what is base64 - computer hope

    what is base64 - computer hope

    64 is encoding that allows files or data to be embedded in media that otherwise does not allow certain data for example binary files

    wxwidgets interface wx base64 h file reference

    wxwidgets interface wx base64 h file reference

    this function encodes the given data using base64 and returns the output as a necessary to contain the data encoded in a base64 string of length srclen

    files base64 encoding - to webservice page 1 open data

    files base64 encoding - to webservice page 1 open data

    hello i would like to transfer images files via webservice the flow should look like this local directory --- take file and encode --- webservice

    base64 ruby core and standard library treehouse

    base64 ruby core and standard library treehouse

    base64 3 08 with jason seifer from time to time in your programming career you ll need to deal with binary encoding one of the many ways to encode binary

    base64 bouncy castle library 1 37 api specification

    base64 bouncy castle library 1 37 api specification

    method summary static byte decode byte data decode the base 64 encoded input data static byte decode java lang string data decode the base 64

    encode and decode base64 data in javascript and java

    encode and decode base64 data in javascript and java

    64 is a generic encoding schemes that encode binary data by treating it numerically and translating it into a base 64 representation

    hiding in plain paste site malware encoded as base64 on pastebin

    hiding in plain paste site malware encoded as base64 on pastebin

    research by recorded future shows threat actors are making use of plain text upload sites like pastebin to serve up malware encoded in

    base64 unboundid ldap sdk for java 4 0 0 - ldap com

    base64 unboundid ldap sdk for java 4 0 0 - ldap com

    this class provides methods for encoding and decoding data in base64 as defined in rfc 4648 it provides a relatively compact way of representing binary data

    base64 the strogg base quakewiki fandom powered by wikia

    base64 the strogg base quakewiki fandom powered by wikia

    the strogg base is a bonus deathmatch map of quake 2 downloadable from id software s ftp it is

    base64 - yarn

    base64 - yarn

    a c module for node-js that does base64 encoding and decoding no longer be necessary as nodejs includes its own base64 encoding decoding functions

    base64 encoding decoding safely move data across various

    base64 encoding decoding safely move data across various

    encode source text from many code pages to base64 or decode from base64 to plain text using this tool

    base64 decode from the command line - electric toolbox

    base64 decode from the command line - electric toolbox

    ommand line base64 tool can help with this either decoding a file or standard input using base64 to decode a file the -d or --decode flag tells base64 it s decoding data on a mac -d is a debugging flag so it s -d and --decode instead

    extension base64 - outsystems

    extension base64 - outsystems

    very simple extension to convert binary data to a base 64 text and vice-versa

    php base64 encoder rapid7

    php base64 encoder rapid7

    php base64 encoder this encoder returns a base64 string encapsulated in eval base64 decode increasing the size by a bit more than one third

    base64 encoder - devtest solutions - 9 1 - ca technologies

    base64 encoder - devtest solutions - 9 1 - ca technologies

    the base64 encoder step is used to encode a file using the base-64 encoding algorithm the result can be stored into a property for use elsewhere in the test

    base64 encoding and decoding of xml elements - tricentis

    base64 encoding and decoding of xml elements - tricentis

    base64 encoding and decoding of xml elements in tosca you can encode contents of resources in base64 and add the result as value to an xml element

    decoding base64 pdf file intersystems developer community

    decoding base64 pdf file intersystems developer community

    i am writing some cache code that will pick up a pdf file base64 encode the contents and then send on to a third party system within a

    using base64 encoding to include binary files inside scripts der

    using base64 encoding to include binary files inside scripts der

    using base64 encoding to include binary files inside scripts may 2 2017 rtrouton leave a comment go to comments when writing scripts it s sometimes useful

    base64 address moneropedia monero - secure private untraceable

    base64 address moneropedia monero - secure private untraceable

    a base64 address is a 516-character base64 encoded i2p destination base64 addresses are primarily used for address-book jump service and also

    behavior extract sprite to base64 string - scirra forums

    behavior extract sprite to base64 string - scirra forums

    a quick and simple behavior to retrieve the current frame sprite as a base64 string useful to communicate between the game and the

    javascript base64 converter - tuxgraphics org

    javascript base64 converter - tuxgraphics org

    javascript base64 http basic authorization encoder this page encodes a short string into base64 format as per chapter quot printable encoding quot of rfc 1421

    base64 to original file convertion in mule 3 5 1 - mulesoft

    base64 to original file convertion in mule 3 5 1 - mulesoft

    4 to original file convertion in mule 3 5 1 hi team i have one webservice consumer in my flow to get files form one webservice but the

    base64 cipher - decoder encoder solver translator - dcode

    base64 cipher - decoder encoder solver translator - dcode

    tool to decrypt encrypt with base 64 base64 is a coding system using 64 characters selected to be compatible with a majority of coding tables it is used with

    coin-all base64 class reference - coin-or

    coin-all base64 class reference - coin-or

    use this class to read and write data in base64 author robert fourer jun ma kipp martin version 1 0 03 14 2004 since os 1 0 remarks it possible to save

    iotivity c sdk base64 h file reference

    iotivity c sdk base64 h file reference

    define b64decode out safesize x x 3 4 macro to calculate the size of output buffer required for a input buffer of length x during base64 decoding

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