1/2/2024 0 Comments Base64 encoding reduce size![]() This includes the last line, but not if it is under 72 characters. I am also assuming there will only be a CRLF pair if the line is 72 characters. Otherwise the number of CRLF characters will be overestimated. The characters generated from Base64 encoding consist of Latin letters, digits, plus, and slash. code_padded_size = ((input_size + ( (input_size % 3) ? (3 - (input_size % 3)) : 0) ) / 3) * 4Īs I said in my comment, the total size must be divided by the line width before doubling to properly account for the last line. Base64 is an encoding algorithm that converts any characters, binary data, and even images or sound files into a readable string, which can be saved or transported over the network without data loss. That is our total output size, including padding. input_size + ( (input_size % 3) ? (3 - (input_size % 3)) : 0)ĭivide this by 3, then multiply by 4. If the input size is not a multiple of three, we must add to make it one. This means that the Base64 version of a string or file will be at most 133 the size of its source. 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). ![]() There are 4 bytes output for every 3 bytes of input. Each Base64 digit represents exactly 6 bits of data. The input base64 is 2.3kb in size and the output PNG has the dimensions of 220×220 pixels. Each Base64 digit represents exactly 6 bits of data. Finally, PHPs default buffer size is 8192 bytes - enough for 143 MIME lines. How can engineers tolerate such wasteful formats It is common for web servers to provide the content in compressed form. Geocar's answer was close, but could sometimes be off slightly. This example decodes a base64-encoded PNG back to a PNG graphics file. Base64-encoded data takes about 33 more space than the original data. Thus the base64 version of a file is at least 4/3 larger than the the original: we use at least 33 more storage than the original file size when encoding a file as base64. ![]()
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