3/10/2023 0 Comments Web base64 encoding![]() ![]() For example, the string "a" with length = 1 gets encoded to "YQ=" with length = 4 - a 300% increase. The increase may be larger if the encoded data is small. This means that the Base64 version of a string or file will be at most 133% the size of its source (a ~33% increase). So, three 8-bits bytes of the input string/binary file (3×8 bits = 24 bits) can be represented by four 6-bit Base64 digits (4×6 = 24 bits). Encoded size increaseĮach Base64 digit represents exactly 6 bits of data. Base64 encoding schemes are commonly used when there is a need to encode binary data that needs to be stored and transferred over media that are designed to. For more details, see the documentation for btoa(). The encoding script runs in your browser, and none of your credentials are seen or stored by this site. Note that btoa() expects to be passed binary data, and will throw an exception if the given string contains any characters whose UTF-16 representation occupies more than one byte. ![]() The algorithm used by atob() and btoa() is specified in RFC 4648, section 4. atob(): decodes a base64 encoded string("atob" should be read as "ASCII to binary"). ![]()
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