MP4MKV

MP4 to MKV Converter

Convert MP4 video to MKV, right in your browser.

Drop a MP4 file here or click to browse

Converts to MKV entirely in your browser — files never leave your device.

How to convert MP4 to MKV

Drop your MP4 file into the box above, or click to browse.
Click Convert. Nothing is uploaded to a server — it all happens in your browser (the first conversion loads a small converter engine, so it takes a moment longer).
Click Download to save your MKV file.