Repair a corrupted M4A file that won't play.
Upload an M4A that won't open or play. We rebuild the file and let you hear a free preview clip. Pay only if it worked.
Upload your audio fileFree preview before you pay
Your files auto-delete within 48 hours
No person watches your video as part of repair
Failure-mode explanation
M4A is what phones and laptops write for voice memos, recorded calls, and AAC music — an MP4 container wrapped around AAC audio. Most "corrupted M4A" problems are damage to that container: the `moov` atom that indexes where the audio is and how long it runs got damaged or was never written, which is exactly what an interrupted recording or a crashed app leaves behind.
When the container index is missing, a player can't find the audio and shows an error or plays nothing — even though the AAC audio inside is often intact. FileFix reads what's actually in the file, rebuilds the container index, and re-assembles a playable file. You hear a free watermarked preview clip and see how much we recovered before paying.
This works for the large majority of container and index problems in M4A files. It can't rebuild a file that never captured any audio.
Can / can't honesty block
We can usually fix
- M4A voice memos, recorded calls, and AAC music files that won't open or play after an interrupted save.
We can't fix
How it works
- Upload rebuild
- Free preview pay $8 and download.
About half of real-world corrupted files repair fully; you always preview first.
Upload your audio file
Free preview · pay only if it worked · files auto-delete within 48 hours
Related fixes
Questions
Is this the same as a voice memo?
Often, yes — most phone voice memos are M4A files. If yours won't play, this is the right page.
Is it private?
Yes — encrypted upload, automatic processing, auto-deleted within 48 hours.
What if it doesn't work?
No preview, no charge.