AMR to M4R converter
Turn AMR files into M4R for free. The conversion runs entirely in your browser, so your audios are never uploaded anywhere.
How to convert AMR to M4R
- Add your AMR files. Drop one or more .amr files on the box above, or tap it to pick them from your device.
- Let it convert. The first audio you convert loads the converter once (about 31 MB, then cached). After that it runs on your device; a progress bar shows how far along it is.
- Download the M4R. Press Download next to each file. Nothing was sent to a server, so close the tab and it's gone.
What is a AMR file?
AMR is the speech format old phones and some Android call recorders and voice notes use. It is tuned for voice at very small sizes.
What is M4R?
M4R is the iPhone ringtone format: AAC audio in an MP4 container with a different name. iPhones only accept ringtones as M4R, and only up to 40 seconds.
Why convert AMR to M4R?
AMR is great for phone calls and voice recordings, but music sounds poor in it and most computers can't play it. M4R is the better choice for iPhone ringtones and alert sounds; keep in mind it only works as a ringtone on Apple devices, and anything over 40 seconds is cut.
Will I lose quality?
M4R uses lossy compression tuned so the difference is invisible to the ear at normal use. We use high-quality settings by default.
Private by design
Most online converters upload your file to their servers. This one doesn't: the converter itself is loaded into your browser and works offline from there, so your audios never leave your phone or computer.
Questions
Is this AMR to M4R converter free?
Yes, completely free, with no sign-up, no watermark and no daily limit.
Are my AMR files uploaded?
No. The conversion happens inside your browser on your own device. Nothing is sent to us or anyone else.
Can I convert AMR to M4R on iPhone or Android?
Yes, in a modern browser. Phones are slower than computers for video, and very long videos can run out of memory on older phones.
Can I convert several files at once?
Yes. Drop as many as you like; they are converted one after another and each gets its own download button.
Is there a file size limit?
No fixed limit, but your browser has to hold the whole file in memory, so files over about 2 GB may fail.