MKV to WebM
Converter
Convert short MKV videos to WebM on your device. Free conversion for clips up to 50 MB and 60 seconds, with no file uploads.
Choose MKV
Drop one file here, or choose it from your device.
One clip · 50 MB · 60 seconds · up to 1080p input. Output fits 1280 × 720 at 30 fps. Audio is kept when present.
MP4/MOV use H.264 and AAC. WebM uses VP8 and Opus. HDR, multiple audio tracks, and subtitles are not supported.
The converter downloads about 32 MB on first use. Short clips work best; processing speed depends on your device. Keep this tab open.
How it works
- Choose a MKV file within the limits above.
- Convert to WebM. Cancel at any time; your original stays unchanged.
- Download the verified result before leaving or reloading this page.
These tools re-encode video. Quality may change, output can be larger, and source metadata is removed. Clips that exceed limits are rejected rather than trimmed. The whole output is decoded before its download appears.
Video converters
Your privacy
Your file is processed in a separate worker on this device. We do not upload it. Cancel stops the worker; clearing or leaving this page releases the selection and results. Saved downloads remain on your device. With your permission, Google Analytics measures visits, conversion outcomes, download clicks, and errors and may use cookies; our events do not include file contents or filenames.