Convert M4R to CAF
M4R is great for custom iPhone ringtones and text tones, but CAF is the better choice for iOS app sounds and Apple developer workflows. Convert M4R to CAF 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 CAF
- 1
Tap Choose files and select one or more M4R files (or drag them in).
- 2
Check that CAF 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 CAF downloads automatically. Converting several files? Grab them all as a ZIP.
M4R vs CAF
CAF is lossless, but it can't restore detail already removed by M4R's compression — the file just gets bigger. Convert when an app or editor requires CAF.
| M4R | CAF | |
|---|---|---|
| Full name | iPhone Ringtone (AAC) | Core Audio Format |
| Type | Audio | Audio |
| Compression | Lossy | Lossless |
| Developed by | Apple | Apple |
| Introduced | 2007 | 2005 |
| Plays on iPhone | ✓ Yes | ✓ Yes |
| Plays on Android | ✕ No | ✕ No |
| Plays on Windows | ◐ Partly / with an app | ✕ No |
| Plays on Mac | ✓ Yes | ✓ Yes |
About M4R and CAF
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.
CAF: CAF is Apple's flexible audio container used inside iOS and macOS apps and by GarageBand. Files can be any length and hold many codecs.
Frequently asked questions
How do I convert M4R to CAF on my phone?
Will converting M4R to CAF reduce quality?
Is this M4R to CAF converter free?
Are my files uploaded to a server?
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