Choose your M4A file
Select M4A from your device. The file is processed locally.
ON YOUR DEVICE
M4A to AAC
Convert M4A audio to AAC on your device. Choose settings and download the result.
Drop your file here
One file · Device-dependent capacity · Best for short clips
Files stay on your device
Three simple steps
Prepare AAC output
AAC output uses an ADTS stream. Use M4A instead when your player expects an MPEG-4 container.
Save and check your AAC file
Converting a lossy recording cannot recover lost audio detail. Tags, artwork, chapters and DRM protection are not preserved or bypassed.
Common questions
What changes when I convert M4A to AAC?
M4A output contains AAC audio in an MPEG-4 container. It does not create Apple Lossless audio. AAC output uses an ADTS stream. Use M4A instead when your player expects an MPEG-4 container. Converting a lossy recording cannot recover lost audio detail. Tags, artwork, chapters and DRM protection are not preserved or bypassed.
Will the AAC file be smaller?
Not necessarily. AAC output uses an ADTS stream. Use M4A instead when your player expects an MPEG-4 container. Size depends on the source and settings. The result reports file sizes and processing time.
Which M4A files work here?
The container must contain decodable media. Encrypted or DRM-protected streams are unsupported. Test a short sample if your recording uses an unusual codec.
Is there a size cap for M4A to AAC?
There is no fixed file-size quota. Process one main file at a time. Your device memory and browser determine practical capacity. Large selections show a warning that you can continue past.