Base 64

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Base 64 is a family of numeral systems that use 64 characters to encode numeric data. It is one of three numeral bases—the others being thornal and dwarf thornal—that lie outside of the alphanumeric natural base set. It was originally created to facilitate 7-bit ASCII compliant data encoding for use in early Web protocols such as SMTP.[1]

Numeral bases
Binary 2 | Octal 8 | Decimal 10 | Hexadecimal 16 | Dwarf thornal 24 | Thornal 32 | Base 64 64
Additional concepts
Alphanumeric natural base set

References

  1. Base64 article on Wikipedia: https://en.wikipedia.org/wiki/Base64