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Base64 is a group of similar binary-to-text encoding schemes that represent binary data in an ASCII string format by translating it into a radix-64 representation. Each base64 digit represents exactly 6 bits of data (Source: Wikipedia ).

The passage of Base64 encoded strings isn’t ideal in URLs because, while the Base64 alphabet includes A-Z, a-z, and 0-9, it also includes + and /… potentially returning erroneous results when used in a URL. As recommended by RFC 4648 , a Base64URL string (replacing the \ and + with _ and ) can be created using the functions described below. They’re referenced in a number of our articles.

See also our Base64 online encoding tool.

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