![]() ![]() Very roughly, the final size of Base64-encoded binary data is equal to 1.37 times the original data size + 814 bytes (for headers). What is the final size of Base64-encoded binary data? Put another way, every 3 bytes of data will result in 4 Base64 characters. What is the length of a Base64 character?įor reference, the Base64 encoder’s length formula is as follows: As you said, a Base64 encoder given n bytes of data will produce a string of 4n/3 Base64 characters. The disadvantage is that encoding the message using Base64 increases its length – every 3 bytes of data is encoded to 4 ASCII characters. This means that the Base64 version of a string or file will be at least 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). Why does Base64 increase size?Įach Base64 digit represents exactly 6 bits of data. You will want to compress the original binary data and then base64 the compressed data, or don’t bother coverting to base64 atall. Base64 is already encoded in a way which does not suit most compression algorithms – see Why does base64-encoded data compress so poorly? for details. The increase may be larger if the encoded data is small.ġ Answer. How much bigger is Base64 encoded data?Įncoded size increase This means that the Base64 version of a string or file will be at least 133% the size of its source (a ~33% increase). Do you see the pattern? It happens that 16-byte (128-bit) encryption keys are very commonly encoded in Base64, and since 16 mod 3 = 1, their encoding will end with =. It’s not a hash though, so small changes in the input will only result in small changes in the output.Ī Base64 string will end with = if and only if the number of bytes it encodes, mod 3, equals 1. But yes, different input strings will always encode to different Base64-encoded strings, and the same input string will always encode to the same Base64-encoded string. Is Base64 encoding always the same?Īrtjom B. The new format was developed by Fraunhofer HHI, the same firm that created MPEG-3, H. There’s a new standard for encoding video in town, and it is reportedly able to reduce file sizes by 50%. ![]() 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. Does base64 increase size?Įncoded size increase This means that the Base64 version of a string or file will be at least 133% the size of its source (a ~33% increase). The base64 conversion of a given string will always be the same. use a pure binary post body rather than base-anything (this is effectively base-256).use a higher base (although you’ll need to write the encode/decode manually, and you’ll still only be able to get to about base-90 or something, so you won’t drastically reduce the size).How do you reduce the length of a string in Base64? ![]()
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