The perfect match
Most modern WEBM files store their sound as Opus. That includes recordings made with browser tools, web meeting apps and many videos saved from the web. Converting WEBM to OPUS can therefore be a pure copy: choose Original audio in the Save audio as list, and the tool takes the Opus track out of the video without decoding it. No new compression, no quality loss. Even long recordings are done in a moment, and the file is as small as the sound inside the video. A note tells you the file type of the copy before you start.
Older WEBM files sometimes use Vorbis instead. With OPUS selected, that sound is encoded to Opus at the bitrate you choose.
Why Opus is a good format to keep
- It is very efficient. Speech is clear at 24 to 32 kbps, and music sounds good at 96 to 128 kbps.
- It is open and free to use, standardized by the IETF.
- It is used by WhatsApp and Telegram voice messages, Discord and WebRTC calls, so most phones and browsers already support it.
Where OPUS files play
| Platform | Support |
|---|---|
| Chrome, Firefox, Edge | Yes |
| Android | Yes |
| Windows 10 and 11, VLC | Yes |
| Recent iPhone and Mac | In many apps; older versions vary |
| Car stereos, old MP3 players | Usually not |
For devices without Opus support, choose WEBM to MP3 or WEBM to M4A.
When to re-encode instead
Keep OPUS selected and choose a bitrate if you want an even smaller file than the track inside the video. A long recorded lecture, for example, can go down to 32 kbps and still sound clear, because Opus handles voices well at low rates. Opus always works at 48 kHz, which the tool handles automatically. If you only need part of a recording, set the start and end in Trim & tags.
Everything is done in your browser, so private calls and lessons stay on your device. For the Vorbis codec in an Ogg file, see WEBM to OGG.