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.
Free preview — pay only if you download ($8)
Your files auto-delete — delete them sooner anytime
No person looks at your file as part of repair
Uploading your file.
Keep this tab open while the file transfers. Large files can take a few minutes.
Starting upload...
Recovering what we can.
Analyzing your file...
Here's what we recovered.
Review the watermarked preview before checkout. It is 12 seconds sampled from the start, middle and end of your recording.
Your files auto-delete — delete them sooner anytime
No person looks at your file as part of repair
Repair your file
Choose a supported file to see what can be repaired before checkout.
Simulated checkout — no payment is processed.
Optional — we'll email your private download link.
You preview before you pay. If the download is materially worse than the preview you approved, we'll refund you.
Try another fileGood news — your file isn't damaged. No charge.
There's nothing to repair. If it still looks broken, the issue may be the player, codec, or viewer on your device rather than the file itself.
We couldn't recover this one.
The file is too damaged to rebuild, so there is nothing to preview and no charge.
Have another clip from the same device?
A healthy video recorded on the same device — ideally the same settings — gives the repair engine a template to rebuild from. It can unlock repairs that fail on their own.
Unrepaired files are kept encrypted for up to 30 days, then deleted.
FileFix can't fix that kind of file yet.
Right now we repair video, audio, document, and image files (MP4, MOV, M4V, MKV, AVI, TS, MTS, M2TS, MPG, MPEG, VOB, 3GP, WebM, FLV, M4A, WAV, MP3, AAC, FLAC, OGG, AIFF, XLSX, DOCX, PPTX, ODT, ZIP, PDF, AI, HEIC, and HEIF). We're adding support for more formats over time.
Something went wrong.
The request could not be completed.
Why M4A files won't play
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.
Before any repair, check whether a cleaner copy of the recording already exists. An iPhone voice memo may still be in the Voice Memos app's Recently Deleted folder or synced to another device through iCloud; a recording shared over chat or email may be complete at the sender's end even if your copy was cut off in transfer. A clean original beats any rebuild, because repair can only work with the audio bytes that are actually in the file.
Trying a different player is also free and worth a minute: open the file in VLC or on another device to rule out a player-specific quirk. When every player refuses the same file, the container itself is damaged. What generally does not help is a format converter — an "M4A to MP3" tool has to read the file first, which is exactly the step that fails, so it stops with the same error the player showed.
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 many container and index problems in M4A files. It can't rebuild a file that never captured any audio.
What we can and can't fix
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
- Genuinely empty files, deleted files, or DRM-protected tracks from a music store. More →
How it works
-
Upload Drop a supported audio file in. It uploads over an encrypted connection. The repair runs automatically — no person listens to your file.
-
Free Watermarked Preview You hear a free watermarked preview clip and see exactly how much we recovered.
-
Pay & Download If it's right, you pay $8 once and download a clean, full-quality audio file.
About half of real-world corrupted files repair fully; you always preview first.
See what's recoverable.
Free preview · pay only if it worked · private & auto-deleted
Related fixes
Questions
Often, yes — most phone voice memos are M4A files. If yours won't play, this is the right page.
Usually not. A converter has to decode the M4A before it can write an MP3, and a damaged container fails at that first step — so the converter reports the same error your player did. The container index has to be rebuilt before any conversion is possible.
Not necessarily. The duration a player displays comes from the container index, not from the audio itself, so a zero or nonsense length often means the index was never finished while the audio bytes are still in the file. The free preview clip is how you find out — it plays recovered audio, not metadata.
Almost always because the recording never finished cleanly: the app crashed, the phone rang, the battery died, or storage ran out mid-save. The closing index gets written last, so an interrupted save leaves real audio with no map to it.
Yes — encrypted upload, automatic processing. Originals of successful repairs are deleted when your repair is delivered; unrepaired files are kept encrypted for up to 30 days, then deleted.
No preview, no charge.