AAC to M4A Converter

Have a raw .aac stream you want as a proper .m4a file? This free converter re-wraps AAC audio into the MPEG-4 .m4a container — the tag-friendly format Apple uses — in seconds, no software or signup. Files up to 30MB are converted directly and nothing is stored after your download.

How to convert AAC to M4A

1. Upload your AAC file

Drag a file onto the box above, or click to browse. Raw .aac and existing .m4a files are both accepted.

2. Choose a bitrate

M4A is already selected as the output. Pick a bitrate for the AAC audio inside — 320 kbps for best quality.

3. Convert & download

Click Convert & Download. Your .m4a file downloads automatically, ready for the Apple Music app and iTunes.

Why .m4a instead of .aac?

Both hold AAC audio, but a raw .aac stream can't reliably carry metadata like title, artist, and album art. The .m4a container can — which is why Apple uses it for iTunes and Apple Music. Re-wrapping to .m4a gives you a tidy, taggable file. See AAC vs M4A.

Frequently Asked Questions

How do I convert AAC to M4A?

Upload your .aac file, keep M4A selected and pick a bitrate, then click Convert & Download. The .m4a file is created and downloaded automatically.

What's the difference between .aac and .m4a?

Both contain AAC audio. .m4a is an MPEG-4 container that also stores metadata and album art; a raw .aac stream cannot. The codec inside is the same.

Does converting AAC to M4A lose quality?

This tool re-encodes the AAC at your chosen bitrate, so pick 320 kbps to keep the result transparent for almost all listeners.

Is the AAC to M4A converter free?

Yes — it's completely free, with no account, no watermarks, and no limit on how many files you convert.