Convert M4R to AC3
M4R is great for custom iPhone ringtones and text tones, but AC3 is the better choice for home theatre and surround sound. Convert M4R to AC3 in seconds, right in your browser.
- No upload — 100% private
- Fast, lossless when possible
- Free & unlimited
- Works on iPhone & Android
Keep this tab open — the conversion runs on your device, nothing is uploaded.
Add more files above to keep converting.
How to convert M4R to AC3
- 1
Tap Choose files and select one or more M4R files (or drag them in).
- 2
Check that AC3 is selected. Use Advanced options for bitrate, channels or trimming.
- 3
Press Convert. Everything happens on your device — no upload, no waiting in a queue.
- 4
Your AC3 downloads automatically. Converting several files? Grab them all as a ZIP.
M4R vs AC3
Both formats are lossy, so the audio is re-encoded once. Pick High quality to keep it as close to the original as possible, or Small for the smallest file.
| M4R | AC3 | |
|---|---|---|
| Full name | iPhone Ringtone (AAC) | Dolby Digital (AC-3) |
| Type | Audio | Audio |
| Compression | Lossy | Lossy |
| Developed by | Apple | Dolby Laboratories |
| Introduced | 2007 | 1991 |
| Plays on iPhone | ✓ Yes | ◐ Partly / with an app |
| Plays on Android | ✕ No | ◐ Partly / with an app |
| Plays on Windows | ◐ Partly / with an app | ✓ Yes |
| Plays on Mac | ✓ Yes | ✓ Yes |
About M4R and AC3
M4R: M4R is the iPhone ringtone format. It is an AAC audio file (the same as M4A) with a different extension, and iOS only accepts ringtones up to 30–40 seconds long.
AC3: AC3 is Dolby Digital surround sound, used on DVDs, Blu-rays and TV broadcasts. It supports up to 5.1 channels.
Frequently asked questions
How do I convert M4R to AC3 on my phone?
Will converting M4R to AC3 reduce quality?
Is this M4R to AC3 converter free?
Are my files uploaded to a server?
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