AC3 to M4A converter
Convert AC3 to M4A in seconds, free and unlimited. No upload, no sign-up, no watermark: your audio never leaves your device. Re-encodes the audio into M4A.
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Quick answer: To convert AC3 to M4A, add the AC3 file to the iHateFiles AC3 to M4A converter and press Convert. The conversion runs in your browser, so the file is never uploaded, and it is free with no sign-up, watermark or size limit. Re-encodes the audio into M4A.
Should you convert AC3 to M4A?
Do this when M4A plays somewhere AC3 does not. It is a second round of lossy compression, so set the bitrate at or above the original.
Both AC3 and M4A are lossy
AC3 (Dolby Digital) has already discarded some of the sound, and M4A (AAC) will discard a little more. The M4A encoder works from the AC3, not the original recording, so pick a bitrate at or above the source. A lower one saves space and costs quality you cannot get back.
Where the M4A will play
M4A plays on Apple devices, Android, browsers and most modern players.
AC3 and M4A side by side
| AC3 | M4A | |
|---|---|---|
| Inside the file | Dolby Digital | AAC |
| Compression | Lossy | Lossy |
| Carries sound | Yes | Yes |
| One minute of stereo | 3 to 5 MB | 1 to 1.9 MB |
| Plays on | DVD players, AV receivers and TVs | Apple devices, Android, browsers and most modern players |
| Here | Read and write | Read and write |
What usually goes wrong
About the AC3. Playing a 5.1 AC3 track on stereo speakers can leave dialogue almost inaudible, because the centre channel carrying it is not being mixed in. Downmixing to stereo during conversion fixes that.
About the M4A. M4A, M4B, M4R and AAC are largely the same thing with different extensions. Renaming usually works, though it is not something to rely on.
How to convert AC3 to M4A
- Add your AC3 file. It is read from your disk and stays there.
- Check the settings. The output format is already set to M4A.
- Press convert and the M4A file is saved back to your device.
Questions
How do I convert AC3 to M4A?
Open this page, add your AC3 file, and press convert. The file is decoded and re-encoded by your own browser and saved back to your device. Nothing is uploaded.
Is this AC3 to M4A converter free?
Yes, completely. There is no account, no sign-in, no watermark and no daily limit, because there is no server doing the work. Your own device does it.
Are my files uploaded anywhere?
No. There is no upload endpoint. The conversion runs inside this browser tab, so your file never leaves your device. You can open your browser's network panel and watch: nothing carrying your file is sent.
Is there a file size limit?
No fixed limit. Because the work happens on your machine there is no server quota. The only ceiling is your own device's memory, which for video means very large files may be slow.
Will converting to M4A lose quality?
M4A is a lossy format, so some detail is discarded. The quality control on this page decides how much. The default is set high enough that most people cannot see the difference.
Can I convert several AC3 files at once?
Yes. Add as many as you like and they are converted one after another, then offered as a single ZIP.