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Audio format

M4R converter

An .m4r file is an iPhone ringtone: AAC audio in an MPEG-4 container, identical to an .m4a in everything but the extension. Apple uses .m4r purely as a routing marker so iTunes and iOS file the audio under Tones instead of Music.

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Runs on your device

Drop M4R files here

Batch files can each use a different output. Nothing uploads for local conversions.

Working inputs include camera RAW, browser-local audio/video, PDF, CBZ/CBR comics, office documents, ebooks, markup, 3D models, structured text, images, and archives.

Where M4R comes from

Apple introduced the format with the iPhone's 2007 launch, initially selling ringtone versions of iTunes tracks for an additional fee. The iTunes ringtone-maker era eventually gave way to today's workflow of syncing custom tones through Finder or exporting them from GarageBand.

How M4R works

  • Shares the ISO base media layout of .m4a, carrying AAC-LC audio
  • iOS enforces a 40-second ceiling for ringtones and 30 seconds for alert tones
  • Renaming a DRM-free .m4a to .m4r is a legitimate conversion, provided the duration limit is respected
  • Loudness and fade choices matter, since phone speakers are small and tones fire at random moments

When to use M4R

  • Turning a favorite song's hook into a custom iPhone ringtone
  • Making short alert tones from voice clips or sound effects
  • Porting an Android ringtone collection over to iOS

Strengths and limitations

Strengths

  • The only ringtone format iOS accepts
  • Full AAC quality, indistinguishable from the source track
  • Trivial to produce from almost any audio input

Limitations

  • Tones over 40 seconds are rejected outright
  • Installation still demands a computer sync or a GarageBand workaround, with no direct file-drop on the phone
  • Serves no purpose outside Apple's ecosystem, though a rename back to .m4a makes it playable anywhere

Compatibility

iPhones accept .m4r only through iTunes or Finder sync and GarageBand export, and every Apple device can play it since the audio is ordinary AAC. Other platforms open the file happily after a rename, though Android sources its ringtones from plain MP3 or OGG instead.

Standard iTunes atoms apply, though iOS shows only the title in the ringtone picker.

Convert M4R to another format

Convert other formats to M4R