Description Base64 is an encoding that allows a sequence of arbitrary bytes to be encoded as a sequence of printable ASCII characters. For the definition of Base64, see RFC 1421 or RFC 2045. Base64 is most commonly used as a MIME transfer encoding for email. GLib supports incremental encoding using g_base64_encode_step() and g_base64_encode_close(). Incremental decoding can be done with g_base64_decode_step(). To encode or decode data in one go, use g_base64_encode() or g_base64_decode(). To avoid memory allocation when decoding, you can use g_base64_decode_inplace(). Support for Base64 encoding has been added in GLib 2.12.