Turn MP3 audio files into OPUS. It is converted in your browser, so the file never leaves your device.
Drop MP3 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 MP3 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 OPUS, or download everything as one ZIP if you converted several files.
The MP3 to OPUS 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.
MP3 is lossy, so editing or re-saving it repeatedly degrades the sound. Opus sounds better than MP3 or AAC at low bitrates. MP3 is at home in music and podcasts that must play anywhere; 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.
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. OPUS is written at 128 kbps unless you choose another bitrate.
MP3 is the audio format everything plays. It shrinks audio to roughly a tenth of its uncompressed size by discarding sound most listeners cannot hear. Newer codecs are more efficient, but nothing matches its compatibility.
Opens in Every phone, computer, car stereo and speaker
MP3 converterOpus 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| MP3MP3 audio | OPUSOpus audio | |
|---|---|---|
| Stands for | MPEG-1 Audio Layer III | Opus |
| Type | Audio | Audio |
| Compression | Lossy | Lossy |
| Introduced | 1993, by the Fraunhofer Society and the Moving Picture Experts Group | 2012, by the Internet Engineering Task Force (with Xiph.Org, Mozilla and Skype) |
| Opens in | Every phone, computer, car stereo and speaker | Current browsers, Android, VLC; many music apps and hardware players do not |
| Best for | Music and podcasts that must play anywhere | Voice and music at low bitrates |
| File extension | .mp3 | .opus |
No. The MP3 to OPUS conversion runs inside your browser, on your own phone or computer. The file is not sent to ToAny or to anyone else.
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.
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 MP3 file, press Convert and save the OPUS. 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.