M4A Audio
Unknownaudio
M4A is an audio format based on the MPEG-4 Part 14 file format (ISO/IEC 14496-14), using the lossy AAC (Advanced Audio Coding) codec for audio encoding. It shares the same underlying container structure as MPEG-4 video files, and shares the .m4a file extension with ALAC (Apple Lossless Audio Codec) files, from which it is distinguished by its use of lossy rather than lossless compression. The format was introduced by Apple and is commonly associated with the iTunes ecosystem.
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| Extensions | .m4a.m4b |
|---|---|
| MIME types | audio/mp4 |
| PRONOM | fmt/2094 |
| Wikidata | Q136095526 |
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From PRONOM, Wikidata. Updated 2026-10-20.