![]() ![]() For example, Hex encoding encodes each byte as a pair of Hex characters. This is because base64 is very compact compared to other transfer-safe encoding schemes. You can use ContentLength property of the request to determine what the size is in bytes, although if you are uploading more then one image, it might be trickier. Very roughly, the final size of Base64-encoded binary data is equal to 1.37 times the original data size + 814 bytes (for headers). Why the size of base64-encoded string is larger than the original file. It’s not a hash though, so small changes in the input will only result in small changes in the output. 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. Because a byte actually contains eight bits, this effectively means two bits out of every byte are lost to bureaucracy.īase64 is not encryption. This not only increases your bandwidth bill, but also increases the download time.īase64-encoded data is always a third larger than the raw binary equivalent because a single byte from the Base64 alphabet can only represent six bits of information. Does base64 encoding reduce size?Īlthough Base64 is a relatively efficient way of encoding binary data it will, on average still increase the file size for more than 25%. The increase may be larger if the encoded data is small. ![]() Encoded 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).
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