Note base64 prepare table: abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789 + /)Īccording to the preceding encoding rules, base64 encoding makes the original three bytes encoded into four bytes, that is, the size of the data increases by 33.3%. Add 1 to 2 "=" at the end after the final encoding ". At this time, fill in 1 to 2 0 bytes in the last group. When the number of bytes of the data to be encoded is not an integer multiple of 3, that is to say, the last group is not three bytes long. of an img element as a Base64-encoded string using the following format.
#Does base64 encoding increase size download
This not only increases your bandwidth bill, but also increases the download time. Follow our guidelines to increase the likelihood that your content will appear. Does base64 encoding reduce size Although Base64 is a relatively efficient way of encoding binary data it will, on average still increase the file size for more than 25.
In this way, a 3-byte data is reencoded into 4 bytes. The increase may be larger if the encoded data is small. Add two zeros before the highest bits in each group to make up one byte. Sort the 24-bit data in order and divide the 24-bit data into four groups, that is, 6-bit data in each group. It splits the data to be encoded into byte arrays. Why? Here we need to explore what is base64 encoding.īase64 encoding uses 64 basic ASCII characters to re-encode the data. tobase64string, the data volume increases significantly. When byte is converted to a base64 encoded string through convert.
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