Convert MP3 to M4R
Turn an MP3 into an iPhone ringtone file, cut to 30 seconds or less, on your own device.
- Nothing is uploaded
- Works offline after first use
- Open source
- No watermark · limit is your device’s memory; phones hold less
Turn an MP3 into an M4R iPhone ringtone in your browser: cut up to 30 seconds, add a fade, save the file, and see how to put it on your iPhone. It is free, needs no account and adds no watermark, and your files are not uploaded: everything runs in your browser on your device. The size limit is your device’s memory, and phones hold less; give the page a short while after your first run to save itself for offline use, and then it works offline.
Done
Free, no ads. Support StayPut
Open the network tab. Your files never appear in it.
Add files and run the tool to see every request this tab makes.
Your files are processed on this device and never sent to a server. Reload the page to clear everything from memory.
An iPhone ringtone is an AAC file named .m4r, and it can be 30 seconds long at most, so converting an MP3 means two things: cutting it down and changing the format. This page does both in one step.
Drop the MP3, choose the part, and press Make M4R. The file is cut and encoded in your browser and is not uploaded.
A full-length MP3 will not work as a ringtone as it is: the page keeps the selection under 30 seconds.
How it works
- Drop an MP3.
- Set the start and end on the waveform. iPhone ringtones stop at 30 seconds.
- Press Make M4R and save the file.
In your browser, not on a server
Your browser’s own audio decoders read the file (MP3, AAC in M4A or MP4, Opus or Vorbis in WebM and OGG, FLAC, WAV) into plain samples in your tab. The part you chose is copied, faded if asked, and written as MP3 by LAME compiled to WebAssembly, as a 16-bit WAV, or as AAC in an M4R file by the browser’s own AAC encoder through Mediabunny.
Compared with upload-based tools: Online audio cutters upload your file to a server, surround the download with ads, and some keep the file. Voice memos, interviews and unreleased tracks are private. Here the sound never leaves your device.
Verify it yourself. Give the page a short while after your first run to save itself for offline use, then turn off Wi-Fi or switch to airplane mode and run the tool again. Or open your browser's developer tools (F12, or Cmd-Option-I on a Mac), pick the Network tab, and watch it while you convert. The panel above does the same count for you.
Questions
Can I convert a whole song to M4R?
You can convert a song of any length to a file, but an iPhone only accepts ringtones up to 30 seconds. This page cuts the song down to 29.5 seconds or less for that reason. For a longer .m4a file (an audiobook, say), use the audio converter instead.
How do I get the M4R onto my iPhone?
With a Mac, drag it onto your iPhone’s General tab in Finder; or save the MP3 version of the cut and use GarageBand on the iPhone. The full steps are on the ringtone maker page.
Is the file uploaded anywhere?
No. There is no server in this process. The page is a static file and the work is done by code running inside your browser tab. Give the page a short while after your first run to save itself for offline use; then you can turn off Wi-Fi and it still works.
More video and audio tools
Trim audio
Cut a song, a voice memo or a podcast down to the part you want, with fades if you like. Done on this device, never uploaded.
Merge videos
Combine clips into a single video, in the order you choose. Done on this device, never uploaded.
Side by side video
Show two clips together in one frame, left and right or top and bottom. Done on this device, and nothing is uploaded.
Repeat video
Save a clip repeated end to end as one longer file, by count or by length. Done on this device, never uploaded.
Other conversions
Guides
- How to trim an MP3 fileCutting audio precisely needs to see the waveform, which most built-in apps do not show. Here is what actually works.
- How to reduce MP3 sizeAn MP3 gets smaller when you lower its bitrate, make it mono, shorten it, or switch format. Here is what each saves, with measured results.
- How to merge audio filesJoining voice notes, podcast segments or songs end to end is simple once you know the right tool. Here is the desktop way and a private browser way.