Turn OPUS audio files into M4R. It is converted in your browser, so the file never leaves your device.
Drop OPUS files here
or choose from your computer paste with Ctrl V
from Photos or Files
Ready · other file types work too0 bytes uploaded, ever
Drop OPUS 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.
Press Convert. Open Options first if you want to change the defaults. The work happens in this tab.
Save the M4R, or download everything as one ZIP if you converted several files.
The OPUS to M4R converter is part of this page and runs inside your browser. Your audio files are never sent to ToAny or to anyone else.
Nothing has to travel to a server and back, so the conversion starts the moment you press Convert, even on a slow connection.
No sign-up, no email address and no watermark. Add several files and download them together as a ZIP.
Opus files do not open in many music apps, editors or hardware players. M4R is the only format an iPhone accepts as a custom ringtone. OPUS is at home in voice and music at low bitrates; M4R is the usual choice for custom iPhone ringtones and alert tones. 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.
The conversion uses your browser's own video and audio codecs (WebCodecs), with hardware acceleration where the device has it; the file is read from disk as it goes and can be up to 2 GB. Where the browser lacks a codec, the page falls back to the compatibility engine. An iPhone ringtone is limited to 40 seconds, so only 40 seconds are kept, from the start point you set under Options (the beginning by default). M4R is written at 192 kbps unless you choose another bitrate.
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 converterAn M4R file is an M4A with a different extension, which is how an iPhone recognises it as a ringtone. Ringtones are limited to about 40 seconds.
Opens in iPhone (as a ringtone), iTunes, Apple Music, GarageBand
M4R converter| OPUSOpus audio | M4RiPhone ringtone | |
|---|---|---|
| Stands for | Opus | iPhone ringtone |
| Type | Audio | Audio |
| Compression | Lossy | Lossy (AAC) |
| Introduced | 2012, by the Internet Engineering Task Force (with Xiph.Org, Mozilla and Skype) | 2007, by Apple |
| Opens in | Current browsers, Android, VLC; many music apps and hardware players do not | iPhone (as a ringtone), iTunes, Apple Music, GarageBand |
| Best for | Voice and music at low bitrates | Custom iPhone ringtones and alert tones |
| File extension | .opus | .m4r |
No. The OPUS to M4R conversion runs inside your browser, on your own phone or computer. The file is not sent to ToAny or to anyone else.
M4R 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.
Yes. Add as many as you like, convert them together and download each result or all of them as one ZIP.
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 OPUS file, press Convert and save the M4R. There is nothing to install.
Yes. Files up to 2 GB are accepted. Beyond that the limit is your device's memory, since nothing is uploaded; a computer copes with large files better than a phone.