CAF to M4R Converter
Convert CAF files to M4R in seconds, right in your browser. Drop in one file or a whole folder, pick your quality settings and download - nothing is uploaded to a server.
Drop CAF files here
MP3, WAV, FLAC, M4A, OGG, OPUS, AAC, AIFF, WMA, AMR, MP4, MOV & more · Processed on your device - nothing is uploaded
How to convert CAF to M4R
- Click "Choose files" or drag your CAF files onto the page.
- Make sure "M4R" is selected as the output format (256 kbps is a good default).
- Click Edit to select the best 30-40 seconds of the song, then Trim.
- Click Convert, then Download your M4R files.
Why convert CAF to M4R?
M4R files are typically 5-10x smaller than CAF, making them ideal for phones, sharing and streaming.
M4R is the only format iPhone accepts for custom ringtones. Trim your clip to 40 seconds or less.
M4R is best for custom iPhone ringtones and alert tones. iPhone (via Finder, iTunes or GarageBand), macOS.
Will I lose quality?
M4R is a lossy format, so some inaudible detail is removed to save space. At 256 kbps or higher most listeners cannot tell the difference from the original CAF.
CAF vs M4R
| CAF | M4R | |
|---|---|---|
| Full name | Core Audio Format | iPhone Ringtone (AAC) |
| Type | uncompressed | lossy |
| Best for | Xcode/iOS app sounds and very long Apple recordings | custom iPhone ringtones and alert tones |
| Typical size | ~10 MB at 16-bit / 44.1 kHz per minute | ~1.9 MB at 256 kbps per minute |
| Compatibility | macOS, iOS, Logic Pro, Xcode. | iPhone (via Finder, iTunes or GarageBand), macOS. |
| Developed by | Apple (2005) | Apple (2007) |
CAF to M4R: questions
How do I convert CAF to M4R?
Open this page, add your CAF file, make sure M4R is selected as the output format and click Convert. Your M4R file is ready to download in seconds.
Will converting CAF to M4R lose quality?
M4R is a lossy format, so some inaudible detail is removed to save space. At 256 kbps or higher most listeners cannot tell the difference from the original CAF.
Is this CAF to M4R converter free and safe?
Yes. It's free with no watermark or sign-up. Files are processed locally in your browser, so your audio is never uploaded or stored on our servers.
Can I convert many CAF files to M4R at once?
Yes - add up to 5 files at a time on the free plan (unlimited with Pro), convert them all with one click and download them as a ZIP.
What is the difference between CAF and M4R?
CAF (Core Audio Format) is a uncompressed format, apple's modern container for long recordings with no 4 GB file size limit. M4R (iPhone Ringtone (AAC)) is a compressed (lossy) format: the iPhone ringtone format - AAC audio with an .m4r extension, limited to 40 seconds.
Does it work on Mac, Windows, iPhone and Android?
Yes. The CAF to M4R converter runs in any modern browser - Chrome, Safari, Edge or Firefox - on desktop and mobile. No software to install.