MP3 to Opus Converter
Drop in MP3 files and get Opus back in seconds, processed entirely on your device.
MP3 files (most other audio and video files work too). Files stay on your device.
How it works
- Choose your MP3 file, or drop it on the page. You can add several files at once.
- Choose Opus quality: a bitrate (6 to 510 kbps; 64 to 128 kbps is transparent for most music) or leave the default.
- Click Convert. Processing happens on your device and shows progress; you can cancel at any time.
- Preview the result and download the Opus file. With several files, download them all as one ZIP.
About MP3 to Opus conversion
MP3 (MPEG-1/2 Audio Layer III) suits music libraries, podcasts and sharing when you cannot know what the listener uses. Opus (Opus audio, usually in an Ogg container) suits voice notes, podcasts, streaming and small files with high quality at low bitrates.
Both formats are lossy, so converting re-encodes the audio and costs a little quality each time. Keep your MP3 original, and choose a Opus bitrate at least as high as the source for the best result.
For a 4-minute track, a typical MP3 file is about 6 MB and a typical Opus file is about 3 MB. Your own result depends on the bitrate and the audio itself.
MP3 vs Opus
Opus support: Supported in all current browsers and Android, and by Safari 17 and later on Apple platforms. Many older players cannot open it.
MP3 support: Plays on virtually every phone, car stereo, TV, browser and media player made in the last 25 years.
| Detail | MP3 | Opus |
|---|---|---|
| Type | Lossy | Lossy |
| Codec | MP3 | Opus |
| Typical bitrate | 128 to 320 kbps; 192 kbps is a common balance | 6 to 510 kbps; 64 to 128 kbps is transparent for most music |
| A 4-minute track | about 6 MB | about 3 MB |
| File extensions | .mp3 | .opus, .ogg |
| Best for | music libraries, podcasts and sharing when you cannot know what the listener uses | voice notes, podcasts, streaming and small files with high quality at low bitrates |
| Introduced | 1993 | 2012 |
Quality and compatibility notes
- Opus: Not accepted by many older car stereos, portable players and some editing software.
- MP3: Each re-encode loses a little more detail, and there is no true gapless support without extra tags.
- Opus bitrate range: 6 to 510 kbps; 64 to 128 kbps is transparent for most music.
- Tags: Opus stores vorbis-style comments.
Questions
Does converting MP3 to Opus reduce quality?
A little. Both MP3 and Opus are lossy, so converting re-encodes the audio. A high bitrate keeps the loss very small, and keeping your original avoids any permanent change.
How big will the Opus file be?
For a 4-minute track, a typical MP3 file is about 6 MB and a typical Opus file is about 3 MB. Your own result depends on the bitrate and the audio itself.
Is my MP3 file uploaded anywhere?
No. The conversion runs in your browser on your device. The file is never sent to a server, and nothing is stored after you close the page.