MP4→MKV
MP4 to MKV
Repackage MP4 into MKV. Keeps subtitles and extra audio tracks without re-encoding.
or drag and drop your file
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How to convert MP4 to MKV
Three steps to an MKV file
11. Upload your MP4
Click “Upload” or drag a video onto the page. HD and 4K files up to 100 MB accepted.
22. Choose MKV output
MKV is pre-selected for lossless remuxing. Keep every subtitle and audio track, or deselect the ones you don't need.
33. Download the MKV
Hit “Convert”. Your .mkv file is ready in seconds, no quality loss. Works with Plex, VLC and Kodi.
Subtitles & multi-audio
MKV stores unlimited subtitle and audio tracks. Our converter remuxes them intact, good for bilingual movies or commentary.
Open, future-proof container
MKV is patent-free and supported by VLC, Plex, Kodi and most smart TVs. Also convert to WebM, AVI, FLV and audio formats here.
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FAQ
MKV supports multiple audio streams, soft subtitles, chapter markers and advanced codecs. Good for archiving or media servers.
No. By default we do a lossless remux, so quality and bitrate stay identical to the source.
Not yet. Existing subtitle tracks are kept, but you can add new ones later with tools like MKVToolNix.
Most modern smart TVs, Roku, Fire TV and players like VLC and Plex handle MKV. Older devices may need MP4.
Videos up to 100 MB are accepted. Larger files take a bit longer but follow the same process.
All transfers use HTTPS. Files are processed in memory and deleted from our servers within minutes after conversion.