Video tool
Convert MP4 Video to MKV on Your Device
Make a MKV version of an MP4 in your browser for players and archives that benefit from the flexible Matroska container. The source video stays on your device.
- Runs in your browser
- Private processing
- No install
- Files stay on device
Route MP4 → MKV
or drop here · up to 500 MB
Preview (optional)
When your browser supports it, your video appears here. If preview does not load, you can still convert your file normally.
Preview is not available for this file
No worries — your video can still be converted. Set your file name and click Convert when you are ready.
Quick use cases
- Prepare an MKV copy for a media library or compatible player
- Meet a delivery specification that lists MKV
- Test an MP4 asset in a MKV-compatible playback setup
Workflow
- Upload the MP4 video
- Choose a name for the MKV output
- Convert the video to MKV
- Download the MKV file and verify it
Processing notes
- Conversion uses your device processor and keeps the source file local.
- Large or high-resolution MP4 files need more memory to encode as MKV.
- Keeping the tab active can help a long conversion complete reliably.
Compatibility notes
- MKV is suited to players and archives that benefit from the flexible Matroska container.
- Some TVs and upload services accept MP4 but do not list MKV.
- Confirm the destination accepts MKV, not just the codec used by the MP4.
Troubleshooting
- Conversion slow? Close processor-heavy apps or test a shorter section first.
- MKV will not open? Try a player built for MKV and inspect the required codecs.
- Delivery rejected? Compare the file's codec, resolution, and audio settings with the MKV specification.
MP4 to MKV converter FAQ
Why convert MP4 to MKV?
Convert when a player, editor, archive, or delivery system explicitly requires MKV instead of MP4.
Does the MP4 leave my device?
No. The conversion runs locally on your device rather than sending the source video to a processing server.
How do I verify the MKV output?
Open it in the destination player or editor, then check picture, sound, duration, and synchronization before delivery.