Base64 is most commonly used as a MIME transfer encoding for email. GLib supports incremental. Support for Base64 encoding has been added in GLib 2.12. Decode from Base64 or Encode to Base64 - Here, with our simple online tool. The Base64 term originates from a specific MIME content transfer encoding. Encoding can be either 'Q' denoting Q-encoding that is similar to the quoted-printable encoding, or 'B' denoting base64 encoding. Encoded text is the Q-encoded or base64-encoded text. An encoded-word may not be more than 75 characters long, including charset, encoding, encoded text, and delimiters.