Choose your MKV file
Select MKV from your device. The file is processed locally.
ON YOUR DEVICE
MKV to WebM
Convert MKV videos to WebM on your device. Choose settings and download the result.
Drop your file here
One file · Device-dependent capacity · Best for short clips
Files stay on your device
Three simple steps
Prepare WebM output
WebM output uses VP8 video and Vorbis audio. Player and editing support differs from MP4.
Save and check your WebM file
The video is re-encoded. Extra audio tracks, subtitles, chapters, HDR metadata and DRM protection are not preserved or bypassed.
Common questions
What changes when I convert MKV to WebM?
MKV output uses H.264 video and AAC audio. Browser playback may be unavailable, so use a compatible desktop player. WebM output uses VP8 video and Vorbis audio. Player and editing support differs from MP4. The video is re-encoded. Extra audio tracks, subtitles, chapters, HDR metadata and DRM protection are not preserved or bypassed.
Will the WebM file be smaller?
Not necessarily. WebM output uses VP8 video and Vorbis audio. Player and editing support differs from MP4. Size depends on the source and settings. The result reports file sizes and processing time.
Which MKV files work here?
The container must contain decodable media. Encrypted or DRM-protected streams are unsupported. Test a short sample if your recording uses an unusual codec.
Is there a size cap for MKV to WebM?
There is no fixed file-size quota. Process one main file at a time. Your device memory and browser determine practical capacity. Large selections show a warning that you can continue past.