Convert WebM to Opus
Free online converter for WebM files. Low-latency codec with excellent quality at low bitrates. Nothing to install, no watermark, and every file is deleted automatically.
Drag and drop your files
or
Upload a WebM file to convert it to Opus. Up to 3 files at once, 100 MB each.
Free · up to 3 files · 100 MB each · files deleted automatically after 1 hour.
About WEBM and OPUS
WebM .webm
An open container built for the web, holding VP8, VP9 or AV1 video with Vorbis or Opus audio. Royalty-free by design.
Good for
- Open and royalty-free
- Smaller than H.264 MP4 at similar quality
- Supports transparency, which MP4 does not
Trade-offs
- Weaker support in desktop editors and older devices
- Slower to encode than H.264
- Not the safe choice for sending a file to someone
video/webm
Opus .opus
The current state of the art in lossy audio, standardised by the IETF. It outperforms MP3 and AAC across the range and is dramatically better at low bitrates.
Good for
- Best quality per byte of any format here
- Excellent for speech as well as music
- Open, royalty-free, and low latency
Trade-offs
- Lossy
- Older devices and some players will not open it
- Less familiar, so people distrust the file extension
audio/opus
WEBM and OPUS side by side
| WEBM | OPUS | |
|---|---|---|
| Compression | Lossy (VP9 or AV1) | Lossy |
| Transparency | Yes — with VP9 or AV1 | n/a |
| Typically used for | Web video, background loops with transparency | Voice, streaming, bandwidth-limited audio |
What changes when you convert WEBM to OPUS
Only the sound is kept
This takes the audio track out of the WEBM and writes it as OPUS. The picture is discarded entirely, and no conversion back will return it — keep the WEBM if you still need the video.
This is a re-encode, not a repackage
Some tools can move a stream into a different container untouched when the codecs happen to line up. We do not — every job here is decoded and encoded again, so the conversion takes time in proportion to the length of the file and costs a small amount of quality even where a repackage would have been possible. In exchange the output is predictable: it plays everywhere, rather than inheriting whatever the source happened to contain.
What your OPUS will contain
The output is Opus — encoded with Vorbis at 192 kbps by default. Vorbis is royalty-free and holds up slightly better than MP3 at the same bitrate, though Opus has largely superseded it for new work.
Other WebM conversions
Other ways to get Opus
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