Notation Interchange File Format (NIFF) is a digital file format developed in the 1990s for the exchange of musical notation, based on the Resource Interchange File Format
(RIFF). The NIFF file format is flexible, supported by many programs, and can be imported and exported by most versions of Windows, Apple's Mac OS and Mac OS X
. It is used in music editors where it takes into account page layout aspects, and in music OCR programs. The NIFF format has been superseded by MusicXML.