How to convert MKV to OPUS
To convert MKV to OPUS, upload your MKV file, choose OPUS as the output format and press Convert. The finished OPUS file is ready to save to your phone or computer in seconds, free, with no watermark and no sign-up. Your file is deleted from our server about 30 minutes after the conversion.
This free online converter turns MKV video files into OPUS in your browser, with no software to install and no watermark. The conversion runs on our server using ffmpeg, and the result is ready to save to your phone or computer in seconds. Your MKV file is deleted automatically about 30 minutes after the conversion.
Reasons to switch from MKV to OPUS
- Excellent quality even at very low bitrates
- Handles both speech and music
- Used by WhatsApp, Discord and YouTube
- Opens in: Chrome, Firefox, Android, Discord, VLC; partial on Safari and iOS
What to expect from this conversion
- Only the first audio track is extracted. The picture is dropped, so the file is a small fraction of the video's size.
- OPUS is lossy, so choose High for the best sound or Small for the smallest file.
- Videos with no sound track cannot be converted to audio.
MKV vs OPUS
| Property | MKV | OPUS |
|---|---|---|
| Full name | Matroska Video | Opus Interactive Audio Codec |
| Released | 2002, Matroska.org (open standard) | 2012, IETF (Xiph.Org, Mozilla, Skype) |
| Family | Video | Audio |
| Opens in | VLC, Plex, Kodi, most Android players and modern Windows; limited on iOS and older TVs | Chrome, Firefox, Android, Discord, VLC; partial on Safari and iOS |
| Best for | movie and TV archives with multiple languages; keeping subtitles inside the file | voice messages and calls; streaming at low data rates |
Steps to convert MKV to OPUS
- Drop your MKV file onto the converter, or click to choose it.
- Check that OPUS is selected as the target format and adjust the options if you want.
- Press Convert, then save the new OPUS file to your device when it finishes.
Tips for the best result
- Choose MP3 for the widest compatibility.
- Pick FLAC or WAV if you want to edit the sound afterwards.
Frequently asked questions
How do I convert MKV to OPUS?
Drop your MKV file on the converter, confirm that OPUS is the target format and press Convert. When it finishes, press Save to device or download the OPUS file. No account or software is needed.
Is the MKV to OPUS converter free?
Yes. It is free, with no watermark, no sign-up and no limit on how many files you convert. The site is supported by ads.
What should I know before converting MKV to OPUS?
Only the first audio track is extracted. The picture is dropped, so the file is a small fraction of the video's size. OPUS is lossy, so choose High for the best sound or Small for the smallest file.
Can I extract the sound from a MKV video as OPUS?
Yes. The first audio track is extracted and saved as OPUS. The video picture is not included.
Which programs open OPUS files?
OPUS files open in Chrome, Firefox, Android, Discord, VLC; partial on Safari and iOS.
How large a file can I convert?
Up to 500 MB per file. Files are deleted from the server about 30 minutes after conversion, and no one looks at them.