From Just Solve the File Format Problem
A transfer encoding is a method of reversibly transforming data so that it uses a reduced set of bytes (or other symbols), to make it compatible with a protocol or format that does not allow all possible byte values.
It's not clear how common the term transfer encoding is. Web searches for it are useless, due to noise from the HTTP Transfer-Encoding and MIME Content-Transfer-Encoding headers.
- ASCII Encoded HP 48 Object (ASC)
- Ascii85 (Base85)
- BinHex (.hqx)
- Crockford Base32
- Hex encoding (Base16)
- Binary II (.bny) (for Apple II series) (often squeezed as .bqy)
- Transport Neutral Encapsulation Format (TNEF; winmail.dat)
- URL encoding