How to open a .mkv file: without installing anything

How to open a .mkv file

A .mkv is a MKV file: Holds any codec, any number of audio and subtitle tracks. Ideal for archiving. VLC (free, everything), Windows Media Player, QuickTime, IINA open it. Or drop it below: it opens and converts in your browser, nothing to install.

Drop files here or click to chooseSeveral files at once are fine.

🔒 Nothing is uploaded. Check the Network tab of your browser: it stays empty.

Three ways to open it

Drop the .mkv file above: it opens and converts right here, nothing to install.
For a desktop app: VLC (free, everything), Windows Media Player, QuickTime, IINA.
If it still will not open, convert it to MP4, that is what most people are really after.

Convert a .mkv

MKV → MP4 MKV → WebM MKV → MOV MKV → AVI MKV → GIF MKV → MP3 MKV → WAV MKV → M4A

Questions

What program opens a .mkv file?

VLC (free, everything), Windows Media Player, QuickTime, IINA. Or drop it here, without installing anything.

Why won't my .mkv open?

Either the viewer does not know MKV (holds any codec, any number of audio and subtitle tracks. ideal for archiving.), or the file is damaged or misnamed. Converting to MP4 fixes the first case.

Is it safe to open a .mkv here?

Yes: the file is read in your browser and never leaves your device.