Convert any video file to Opus format online for free. Fast, secure, and easy-to-use video 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 MKV 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 | MKV (source) | Opus (result) |
|---|---|---|
| Container | Matroska | Ogg |
| Developed by | Matroska.org | Xiph.Org / IETF |
| Introduced | 2002 | 2012 |
| Audio codecs | AAC, FLAC, Opus, AC-3, DTS | Opus |
| Compression | Depends on codec | Lossy |
| Approx. file size | 60–300 MB per minute | 0.48–1.44 MB per minute |
| Metadata / tags | Container tags | Vorbis comments |
| Licensing | Royalty-free | Royalty-free |
| Plays natively on | Native: Windows · Needs a player: macOS, iOS, Android, Smart TVs | Native: Web browsers, Android · Needs a player: Windows, macOS, iOS |
| Best for | media archives, multi-language releases, home theatre | voice and calls, podcasts, web delivery |
This extracts the audio and discards the video entirely. The soundtrack inside a MKV file is typically AAC, and it is re-encoded to Opus on the way out.
Expect a much smaller file. Video accounts for most of the bytes, so about 180 MB per minute becomes roughly 1 MB per minute of Opus.
Subtitles do not survive audio extraction, since an audio container has nowhere to store them.
When a video holds several audio tracks, the main one is extracted; alternate language tracks are not merged into the result.
Extracting Opus audio from a MKV video pulls the soundtrack out of the Matroska container and writes it as a standalone Ogg file. The video stream, which holds most of the data, is discarded.
Developed by Matroska.org in 2002, MKV carries H.264, H.265, VP9, or AV1 video and AAC, FLAC, Opus, AC-3, or DTS audio. That combination sets the upper bound on what any conversion can preserve.
Opus was introduced by Xiph.Org / IETF in 2012. It holds lossy-compressed audio (Opus) and plays natively 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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