No. Files are opened entirely in your browser using local JavaScript and WebAssembly. Nothing is sent to a server.

Does it work on mobile?

Yes. The viewer is mobile-first and works on phones, tablets, and desktops.

Video.mkv · .webm

MKV viewer

ready

MKV · .mkv · .webm

Open MKV files

Matroska multimedia container.

Choose a fileor paste · ⌘V

About MKV

Matroska multimedia container.

MKV (Matroska) is the open multimedia container — multiple video, audio, and subtitle tracks in one file. We play what the browser supports natively and surface track metadata.

FAQ

What is a MKV file?: MKV (Matroska) is the open multimedia container — multiple video, audio, and subtitle tracks in one file. We play what the browser supports natively and surface track metadata.
Is my file uploaded?: No. Files are opened entirely in your browser using local JavaScript and WebAssembly. Nothing is sent to a server.
Does it work on mobile?: Yes. The viewer is mobile-first and works on phones, tablets, and desktops.