WMA to OPUS converter
Convert WMA 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 WMA to OPUS, add the WMA file to the iHateFiles WMA 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 WMA to OPUS?
Do this when OPUS plays somewhere WMA does not. It is a second round of lossy compression, so set the bitrate at or above the original.
Both WMA and OPUS are lossy
WMA (Windows Media Audio) has already discarded some of the sound, and OPUS (Opus) will discard a little more. The OPUS encoder works from the WMA, 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.
WMA and OPUS side by side
| WMA | OPUS | |
|---|---|---|
| Inside the file | Windows Media Audio | Opus |
| Compression | Lossy | Lossy |
| Carries sound | Yes | Yes |
| One minute of stereo | 1 MB or so | 0.25 to 1 MB |
| Plays on | Windows, and very little on phones or Macs | 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 WMA. A WMA bought from an early music store may be DRM-locked, and no conversion can lawfully unlock it. A WMA you ripped yourself converts without any trouble.
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 WMA to OPUS
- Add your WMA 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 WMA to OPUS?
Open this page, add your WMA 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 WMA 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 WMA files at once?
Yes. Add as many as you like and they are converted one after another, then offered as a single ZIP.