Audio format
What is a M4A file?
M4A is an audio-only MPEG-4 container, most often holding AAC audio — it's what Apple Music and Voice Memos save by default.
M4A is essentially an MPEG-4 container that's been restricted to audio only, and it's the extension Apple uses by default across iTunes downloads, Apple Music, GarageBand, and Voice Memos. In almost every practical case it holds AAC-encoded audio, so its quality and compression characteristics are effectively the same as AAC — it's really a matter of which extension a given piece of Apple software happened to save the file with.
How to open a M4A file
M4A files open readily in Any modern media player, iTunes/Apple Music, Most web browsers. For real editing rather than just viewing, reach for Audacity (free), GarageBand.
Strengths & limitations
Good for
- good compression efficiency
- native format across Apple apps
Watch out for
- occasionally needs converting for apps that only expect MP3
Convert M4A files
Orbfile can convert M4A both ways, entirely in your browser — pick a direction below:
Frequently asked questions
What does a M4A file contain?+
M4A is an audio-only MPEG-4 container, most often holding AAC audio — it's what Apple Music and Voice Memos save by default.
Can I convert M4A for free?+
Yes — Orbfile's audio converter handles M4A for free, with no file limit, watermark, or account, and it runs entirely in your browser.
Is converting a M4A file safe and private?+
Yes. Orbfile processes M4A files locally on your device using WebAssembly — nothing is uploaded to a server, so there's nothing to leak or store.
Who created the M4A format?+
M4A was developed by Apple / MPEG, first released around 2000s.
Browse the full file format guide.