Convert any audio file to Opus format online for free. Fast, secure, and easy-to-use audio to Opus converter with no software installation required.
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Max file size: 50 MBMax duration: 30 min
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Drag and drop your WebM Audio file, or click to browse for it.
Choose Opus as the output and click Convert. The conversion runs on our servers, so your device does none of the work.
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Your file is used only to make your conversion. It is never published or shared, and the download link expires after one hour.
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How the two formats differ on the things that change your result.
| Specification | WebM Audio (source) | Opus (result) |
|---|---|---|
| Container | WebM (audio-only) | Ogg |
| Developed by | Xiph.Org / IETF | |
| Introduced | 2010 | 2012 |
| Audio codecs | Opus, Vorbis | Opus |
| Compression | Lossy | Lossy |
| Typical bitrate | 64–256 kbps | 64–256 kbps |
| Max sample rate | 48 kHz | 48 kHz |
| Max channels | 8 | 255 |
| Gapless playback | Partial | Yes |
| Metadata / tags | Matroska tags | Vorbis comments |
| Approx. file size | 0.48–1.92 MB per minute | 0.48–1.44 MB per minute |
| Licensing | Royalty-free | Royalty-free |
| Plays natively on | Native: Web browsers, Android · Needs a player: Windows, macOS, iOS | Native: Web browsers, Android · Needs a player: Windows, macOS, iOS |
| Best for | web delivery, HTML5 video, open-source projects | voice and calls, podcasts, web delivery |
Both WebM Audio and Opus are lossy, so this conversion decodes Opus and re-encodes it as Opus. That second encode adds its own loss on top of the first. Choosing a higher bitrate, up to 256 kbps, keeps the damage small enough to be inaudible in most material.
The two formats are aimed at different jobs. WebM Audio is typically used for web delivery, HTML5 video, open-source projects, while Opus is the usual pick for voice and calls, podcasts, web delivery. That difference in intent is what most of the specification gaps above come from.
Expect metadata to be rewritten rather than copied: Matroska tags in the source becomes Vorbis comments in the result. Standard fields map cleanly; niche custom tags often do not.
This page converts WebM Audio files, stored in the WebM (audio-only) container since 2010, into Opus, which uses Ogg and dates from 2012. The differences between the two containers decide what changes in the result.
WebM Audio comes from Google and dates to 2010. It holds lossy-compressed audio (Opus or Vorbis), and that sets the ceiling for anything converted out of it.
Opus comes from Xiph.Org / IETF and dates to 2012. It carries lossy-compressed audio (Opus), and without installing anything it plays on web browsers and Android.
After converting your file, you can use Scriptivox transcription services to convert your audio to text. Perfect for meetings, interviews, podcasts, and more.
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