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 OPUS converter, without the upload.
Turn AMR voice recordings into OPUS. 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 OPUS
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.
OPUS is already chosen
Press Convert. Open Options first if you want to change the defaults. The work happens in this tab.
Download
Save the OPUS, or download everything as one ZIP if you converted several files.
Why ToAny
Private by construction
The AMR to OPUS 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 OPUS: what to expect
AMR does not open in most apps and browsers. Opus sounds better than MP3 or AAC at low bitrates. AMR is at home in voice recordings on older phones; OPUS is the usual choice for voice and music at low bitrates. 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. OPUS is written at 128 kbps unless you choose another bitrate.
AMR vs OPUS
OPUS
Opus audio
Opus is a modern open codec that sounds good at very low bitrates. WhatsApp voice notes, Discord and video calls use it. Standalone .opus files are less widely supported than the codec itself.
Opens in Current browsers, Android, VLC; many music apps and hardware players do not
OPUS converter| AMRAMR audio | OPUSOpus audio | |
|---|---|---|
| Stands for | Adaptive Multi-Rate | Opus |
| Type | Audio | Audio |
| Compression | Lossy, tuned for speech | Lossy |
| Introduced | 1999, by the 3rd Generation Partnership Project | 2012, by the Internet Engineering Task Force (with Xiph.Org, Mozilla and Skype) |
| Opens in | Older phones and VLC; few desktop players | Current browsers, Android, VLC; many music apps and hardware players do not |
| Best for | Voice recordings on older phones | Voice and music at low bitrates |
| File extension | .amr, .awb, .3ga | .opus |
Questions
Are my voice recordings uploaded anywhere?
No. The AMR to OPUS 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 OPUS reduce quality?
OPUS 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 OPUS 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 OPUS. There is nothing to install.
Is there a file size limit?
Yes. AMR to OPUS 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.