M4R (iPhone ringtone)
Also known as: .m4r file, iPhone ringtone format, how to make m4r, custom ringtone
M4R is Apple’s ringtone format — essentially an AAC audio file (the same encoding as M4A) with a .m4r extension, used for custom iPhone ringtones and alert tones. Ringtones are typically short, around 30 seconds or less.
- Apple ringtone format, essentially AAC/M4A
- Used for custom iPhone ringtones and alert tones
- Typically short clips, around 30 seconds
AAC audio with a ringtone extension
An M4R is technically the same as an M4A: AAC-encoded audio in an MP4 container. The .m4r extension simply tells iOS and the Tones library to treat the file as a ringtone or alert tone rather than music.
To make a custom ringtone, you trim a song or sound to a short clip and export it as AAC, then rename the .m4a to .m4r and add it to your device — historically through Finder or iTunes, or with apps like GarageBand on the iPhone itself.
The storage angle
Ringtones are short and compressed, so each M4R is tiny — they rarely make a dent in storage. The bigger consideration is keeping your Tones list tidy by removing tones you no longer use.
On iPhone you manage installed ringtones in Settings > Sounds & Haptics, where you can preview and delete custom tones you have added.