AMR
AMR audio
AMR is a speech codec from the GSM era. Voice recorders and call recordings on older phones saved it. It sounds like a phone call and most modern apps cannot open it.
Opens in Older phones and VLC; few desktop players
AMR converterAMR to M4A converter, without the upload.
Turn AMR voice recordings into M4A. It is converted in your browser, so the file never leaves your device.
Drop AMR files here
or choose from your computer paste with Ctrl V
from Photos or Files
Ready · other file types work too0 bytes uploaded, ever
Convert to
- On your device · nothing is uploaded
- No account, no email
- Batch and ZIP download
- Free
How to convert AMR to M4A
Add your AMR voice recordings
Drop AMR files onto the box above, or click it to choose them. ToAny reads the file's contents to detect the type, so a wrong extension does not matter.
M4A is already chosen
Press Convert. Open Options first if you want to change the defaults. The work happens in this tab.
Download
Save the M4A, or download everything as one ZIP if you converted several files.
Why ToAny
Private by construction
The AMR to M4A converter is part of this page and runs inside your browser. Your voice recordings are never sent to ToAny or to anyone else.
No upload, no queue
Nothing has to travel to a server and back, so the conversion starts the moment you press Convert, even on a slow connection.
Free, without an account
No sign-up, no email address and no watermark. Add several files and download them together as a ZIP.
AMR to M4A: what to expect
AMR does not open in most apps and browsers. M4A sounds better than MP3 at the same file size and is native to Apple devices. AMR is at home in voice recordings on older phones; M4A is the usual choice for music and voice memos on Apple devices. Both formats are lossy, so the content is compressed a second time; start from the best copy you have.
The defaults suit most files. Under Options you can choose the bitrate and trim the start and end.
This pair uses the compatibility engine, ffmpeg built for the browser, because AMR is not handled by the browser's built-in codecs. It is a one-off download of about 10 MB that the browser keeps, it is slower than the built-in codecs, and it takes files up to 1 GB. M4A is written at 192 kbps unless you choose another bitrate.
AMR vs M4A
M4A
M4A audio
M4A is an MP4 file that contains only audio, usually AAC. iPhone Voice Memos and the iTunes Store use it. It sounds better than MP3 at the same size but is not accepted everywhere MP3 is.
Opens in Apple devices, Android, current browsers; some car stereos and older players do not
M4A converter| AMRAMR audio | M4AM4A audio | |
|---|---|---|
| Stands for | Adaptive Multi-Rate | MPEG-4 Audio |
| Type | Audio | Audio |
| Compression | Lossy, tuned for speech | Lossy (AAC); lossless when it holds ALAC |
| Introduced | 1999, by the 3rd Generation Partnership Project | The early 2000s, by the Moving Picture Experts Group (popularised by Apple) |
| Opens in | Older phones and VLC; few desktop players | Apple devices, Android, current browsers; some car stereos and older players do not |
| Best for | Voice recordings on older phones | Music and voice memos on Apple devices |
| File extension | .amr, .awb, .3ga | .m4a |
Questions
Are my voice recordings uploaded anywhere?
No. The AMR to M4A conversion runs inside your browser, on your own phone or computer. The file is not sent to ToAny or to anyone else.
Does converting AMR to M4A reduce quality?
M4A is a lossy format, so a small amount of detail is traded for a smaller file. At the default setting the difference is hard to notice. You can choose the bitrate under Options.
Can I convert several AMR files at once?
Yes. Add as many as you like, convert them together and download each result or all of them as one ZIP.
How do I convert AMR to M4A on Windows, Mac, iPhone or Android?
The steps are the same everywhere because ToAny runs in the web browser: open this page in a current version of Chrome, Edge, Safari or Firefox, add the AMR file, press Convert and save the M4A. There is nothing to install.
Is there a file size limit?
Yes. AMR to M4A runs on the compatibility engine, which takes files up to 1 GB, and a long clip takes a while because it is slower than the browser's built-in codecs. Beyond that the limit is your device's memory, since nothing is uploaded; a computer copes with large files better than a phone.