M4A file format
MPEG-4 Audio · Audio · .m4a
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M4A is AAC audio in an MP4 container. It sounds better than MP3 at the same size and is the default on Apple devices.
Technical details
| Full name | MPEG-4 Audio |
|---|---|
| File extension | .m4a |
| MIME type | audio/mp4 |
| Audio codecs we export | AAC, Apple Lossless (ALAC) |
| Best for | iPhone, iTunes and high-quality compressed audio |
Last updated 2026-11-13
M4A conversions
M4A FAQ
What is a M4A file?
M4A (MPEG-4 Audio) is an audio format. M4A is AAC audio in an MP4 container. It sounds better than MP3 at the same size and is the default on Apple devices.
How do I open a M4A file?
Most modern players such as VLC open M4A files. If yours doesn't, convert it to MP3 above, which plays on every device.
How do I convert a M4A file?
Drop the file into the converter on this page, choose the output format and click “Convert & download”. It's free and runs in your browser without uploading.
What is M4A best for?
iPhone, iTunes and high-quality compressed audio.