MKV (Matroska) is an open container that holds almost any video, sound and subtitle format. Media servers like Plex and Jellyfin and players like VLC love it.
MKV accepts what MP4 holds, so the video and sound are copied without re-encoding. The conversion is quick and lossless. The video never leaves your device. It is read and saved by your browser, so there is no upload, no queue and no copy on a server.
How to convert MP4 to MKV
- Drop your MP4 file on the box above.
- MKV is already selected. You can pick another format if you need one.
- Press Convert to MKV and download the new file.
Questions
Why use MKV instead of MP4?
MKV handles more codecs and several tracks, and it survives an interrupted recording better.
Will phones play MKV?
Android usually does; iPhones need an app like VLC.
Is the quality the same?
Yes, the streams are copied.