H.263 is a standard of the International Telecommunication Union ( ITU) for video decoding with compression of 1995/1996, which is also contained in Part 2 of the MPEG -4 standard by Moving Picture Experts Group.

H.263 describes a video codec which is primarily intended for video conferencing. It is designed for low data rates ( below 64 kbit / s, ie the speed of ISDN ) and optimized relatively little movement, but the standard does not define any particular data transfer rates.

H.263 is a further development of the H.261 standard, which is primarily used as a starting point for the development of MPEG with optimization for higher data transfer rates. It contains a component for strong compression and temporary works best with sequences of films, which show little change between frames.