Convert AAC to M4A
This free AAC to M4A converter changes your Advanced Audio Coding (.aac) file into a MPEG-4 Audio (.m4a) file, right in your browser. There is nothing to install, no account to create, and no limit on how many files you convert.
100% private. Your file is processed locally in your browser with WebAssembly — it is never uploaded to a server, stored, or seen by anyone.
The conversion runs on your own device using ffmpeg compiled to WebAssembly (ffmpeg.wasm), so your file is never uploaded to a server. M4A is best for Apple Music and efficient playback, which is the usual reason to convert from AAC.
Why convert AAC to M4A?
- AAC and M4A are similarly compatible, so you are mainly changing the container.
- At a sensible bitrate, M4A stays close in size to AAC while changing the codec.
- Pick M4A when you need a file made for Apple Music and efficient playback.
AAC vs M4A
| Property | AAC | M4A |
|---|---|---|
| Full name | Advanced Audio Coding | MPEG-4 Audio |
| Container | ADTS | MPEG-4 |
| Typical codec | AAC | AAC |
| Compatibility | Wide | Wide |
| Lossless | No | No |
| Best for | Streaming and mobile devices | Apple Music and efficient playback |
How to convert AAC to M4A
Add your AAC file
Drag and drop your .aac file onto the upload area, or click to browse and pick it from your device.
Start the conversion
Click "Convert to M4A". Everything runs locally with ffmpeg compiled to WebAssembly (ffmpeg.wasm) - your file stays on your device.
Wait a few seconds
A progress bar shows the conversion. The first run is slightly slower while the engine loads, then it is cached.
Download your M4A file
When it finishes, download the .m4a file straight to your device.
Frequently asked questions
Is this AAC to M4A converter free?
Are my files uploaded to a server?
Will I lose quality converting AAC to M4A?
Will the file get smaller or larger?
What is the difference between AAC and M4A?
How long does the conversion take?
Related conversions
Need more formats or options? Use the full Audio Converter.