How to use
- Add a song.
- Drag the window (or use the arrow keys, type a start time, or press Find the loudest part); set the length and fades.
- Export M4R for iPhone or MP3 for Android.
Worked example
Section 1:12 to 1:42 with 1 s fade-in and 2 s fade-out, exported as a 30-second M4R.
Supported formats and limits
| Input | MP3, M4A, WAV, Ogg, FLAC |
|---|---|
| Output | M4R (AAC in MP4), MP3, Ogg Opus, WAV |
| Limits | Ringtones up to 40 seconds (iPhone limit). |
| Engine | In-memory trimming with S-curve fades; AAC (WebCodecs), MP3 (LAME WebAssembly), Opus or WAV encoding via Mediabunny |
Limitations
- iPhone ringtones must be added through Finder, iTunes or GarageBand; browsers cannot install them.
Questions
How long can a ringtone be?
Up to 40 seconds, the iPhone limit. 30 seconds suits most phones.
How do I put the M4R on an iPhone?
This tool only creates the file. Installing it on an iPhone is done with Apple's own apps, for example by syncing it from a computer; Android phones can use an MP3 or Ogg file directly from storage.
Privacy
Runs on your device. Files and text are processed in this browser tab and are not uploaded.
See the privacy policy for how toolsdocks handles data.