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Base64 only uses 6 bits per character (2^6 = 64) to create textual data from image files. This causes an in-efficiency.
According to a wikipedia entry on Base64, this in-efficiency is to protect against 8 bit dirty things like email.
Is Ajax Posting 8 bit clean? If so, is there an alternative to using Base64?
php.net ( as does wikipedia ) claims a 33% in-efficiency for base64_encode..
Kind of. All JavaScript strings are UTF-16, not byte strings. If you’re sending the data with
send, then it will be encoded into UTF-8 before it is sent. As such, you can convert the bytes into Unicode code points, which will then be encoded into UTF-8. When it reaches the server, you’ll have to decode the UTF-8 and then convert the code points back into bytes.For 7-bit data, this will not expand the size of the data at all. For 8-bit data with the most significant bit always set, it will double the size of the data. For 8-bit data with the most significant bit set half of the time, it will increase the size of your data by 50%, which is worse than the Base64 33.3͞% increase.
On the other hand, using
XMLHttpRequestLevel 2 will allows you to send binary data by passingsendanArrayBuffer,Blob, orFormData. However,XMLHttpRequestLevel 2 is only supported in newer browsers.