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- Each character is used to represent 6 bits (log2(64) = 6). Therefore 4 chars are used to represent 4 * 6 = 24 bits = 3 bytes. So you need 4*(n/3) chars to represent n bytes, and this needs to be rounded up to a multiple of 4. The number of unused padding chars resulting from the rounding up to a multiple of 4 will obviously be 0, 1, or 2.
stackoverflow.com/questions/13378815/base64-length-calculation
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The input string is 3 bytes, or 24 bits, in size, so the formula correctly predicts the output will be 4 bytes (or 32 bits) long: TWFu. The process encodes every 6 bits of data into one of the 64 Base64 characters, so the 24-bit input divided by 6 results in 4 Base64 characters.
Nov 27, 2019 · Here's a really helpful overview of when to base64 encode and when not to by David Calhoun. Basic answer = gzipped base64 encoded files will be roughly comparable in file size to standard binary (jpg/png). Gzip'd binary files will have a smaller file size.
Nov 28, 2023 · But with 7-bit characters this loss must be about half the size. Why Only 64 Characters? Base64 would be overkill if it was made only to bypass the ASCII restriction.
Aug 26, 2024 · This means that the Base64 version of a string or file is typically roughly a third larger than its source (the exact size increase depends on various factors, such as the absolute length of the string, its length modulo 3, and whether padding characters are used).
Jan 30, 2019 · There might be some overhead because we often separate the base64 text into lines. 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. That sounds bad.
Aug 26, 2024 · The btoa() method of the Window interface creates a Base64-encoded ASCII string from a binary string (i.e., a string in which each character in the string is treated as a byte of binary data).
Oct 17, 2023 · What happens when you apply base64 encoding and decoding to strings in JavaScript? This post explores the nuances and common pitfalls to avoid. btoa() and atob() The core functions to base64 encode and decode in JavaScript are btoa() and atob(). btoa() goes from a string to a base64-encoded string, and atob() decodes back.
