MP3 to OPUS converter
Convert MP3 to OPUS in seconds, free and unlimited. No upload, no sign-up, no watermark: your audio never leaves your device. Re-encodes the audio into OPUS.
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Quick answer: To convert MP3 to OPUS, add the MP3 file to the iHateFiles MP3 to OPUS converter and press Convert. The conversion runs in your browser, so the file is never uploaded, and it is free with no sign-up, watermark or size limit. Re-encodes the audio into OPUS.
Should you convert MP3 to OPUS?
Do this when OPUS plays somewhere MP3 does not. It is a second round of lossy compression, so set the bitrate at or above the original.
Both MP3 and OPUS are lossy
MP3 (MPEG-1 Layer III) has already discarded some of the sound, and OPUS (Opus) will discard a little more. The OPUS encoder works from the MP3, not the original recording, so pick a bitrate at or above the source. A lower one saves space and costs quality you cannot get back.
Where the OPUS will play
OPUS plays on browsers, Android, WhatsApp and Discord, but not many car stereos or older players.
MP3 and OPUS side by side
| MP3 | OPUS | |
|---|---|---|
| Inside the file | MPEG-1 Layer III | Opus |
| Compression | Lossy | Lossy |
| Carries sound | Yes | Yes |
| One minute of stereo | 1 to 2.4 MB | 0.25 to 1 MB |
| Plays on | everything, including car stereos and hardware twenty years old | browsers, Android, WhatsApp and Discord, but not many car stereos or older players |
| Here | Read and write | Read and write |
What usually goes wrong
About the MP3. Converting an MP3 to another lossy format compounds the damage, because the second encoder is guessing at audio the first one already threw away.
About the OPUS. Opus at 64 kbps sounds better than MP3 at 128, so the bitrate you are used to is roughly double what you need here.
How to convert MP3 to OPUS
- Add your MP3 file. It is read from your disk and stays there.
- Check the settings. The output format is already set to OPUS.
- Press convert and the OPUS file is saved back to your device.
Questions
How do I convert MP3 to OPUS?
Open this page, add your MP3 file, and press convert. The file is decoded and re-encoded by your own browser and saved back to your device. Nothing is uploaded.
Is this MP3 to OPUS converter free?
Yes, completely. There is no account, no sign-in, no watermark and no daily limit, because there is no server doing the work. Your own device does it.
Are my files uploaded anywhere?
No. There is no upload endpoint. The conversion runs inside this browser tab, so your file never leaves your device. You can open your browser's network panel and watch: nothing carrying your file is sent.
Is there a file size limit?
No fixed limit. Because the work happens on your machine there is no server quota. The only ceiling is your own device's memory, which for video means very large files may be slow.
Will converting to OPUS lose quality?
OPUS is a lossy format, so some detail is discarded. The quality control on this page decides how much. The default is set high enough that most people cannot see the difference.
Can I convert several MP3 files at once?
Yes. Add as many as you like and they are converted one after another, then offered as a single ZIP.