Convert MKV to WEBM
Pull the soundtrack out of any MKV video and save it as WEBM in seconds. Conversion happens inside your browser, so even large or private videos are never uploaded.
Drop MKV files here
MP3, WAV, FLAC, M4A, OGG, OPUS, AAC, AIFF, WMA, AMR, MP4, MOV & more · Processed on your device - nothing is uploaded
How to convert MKV to WEBM
- Click "Choose files" or drag your MKV videos onto the page.
- Make sure "WEBM" is selected as the output format (128 kbps is a good default).
- Optionally click Edit to trim, adjust volume or add effects.
- Click Convert, then Download your WEBM files.
Why convert MKV to WEBM?
WEBM files are much smaller than video and play on any music player, phone or car stereo.
WEBM is best for web apps, HTML5 audio and browser-based recording. Chrome, Firefox, Edge, Android, VLC. Safari 15+.
Will I lose quality?
The audio is decoded from the MKV video and encoded to WEBM. Choose a lossless format (WAV/FLAC) for zero loss, or a high bitrate for WEBM.
MKV vs WEBM
| MKV | WEBM | |
|---|---|---|
| Full name | Matroska Video | WebM Audio (Opus) |
| Type | video | lossy |
| Best for | films, TV recordings and archives | web apps, HTML5 audio and browser-based recording |
| Typical size | varies | ~0.9 MB at 128 kbps per minute |
| Compatibility | VLC, Plex, Kodi, most modern players. | Chrome, Firefox, Edge, Android, VLC. Safari 15+. |
| Developed by | - | Google (2010) |
MKV to WEBM: questions
How do I convert MKV to WEBM?
Open this page, add your MKV file, make sure WEBM is selected as the output format and click Convert. Your WEBM file is ready to download in seconds.
Will converting MKV to WEBM lose quality?
The audio is decoded from the MKV video and encoded to WEBM. Choose a lossless format (WAV/FLAC) for zero loss, or a high bitrate for WEBM.
Is this MKV to WEBM converter free and safe?
Yes. It's free with no watermark or sign-up. Files are processed locally in your browser, so your audio is never uploaded or stored on our servers.
Can I convert many MKV files to WEBM at once?
Yes - add up to 5 files at a time on the free plan (unlimited with Pro), convert them all with one click and download them as a ZIP.
What is the difference between MKV and WEBM?
MKV (Matroska Video) is a video format, an open container that can hold many audio, video and subtitle tracks. WEBM (WebM Audio (Opus)) is a compressed (lossy) format: opus audio in a WebM container - the native format of browser recordings and YouTube audio streams.
Does it work on Mac, Windows, iPhone and Android?
Yes. The MKV to WEBM converter runs in any modern browser - Chrome, Safari, Edge or Firefox - on desktop and mobile. No software to install.