Analysis of information sources in references of the Wikipedia article "Base64" in English language version.
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The ratio of output bytes to input bytes is 4:3 (33% overhead)
Otherwise, numbers take the form [base#]n, where the optional base is a decimal number between 2 and 64 representing the arithmetic base, and n is a number in that base.
The ratio of output bytes to input bytes is 4:3 (33% overhead)