Minimal MKV Player (HTML/CSS/JS + ffmpeg.wasm transmux + soft subs)

Subtitles: Size: Offset (ms): Background

Drag & drop a local **.mkv** video or `.srt/.vtt` subtitle file here. You can also use the “Subtitles → Add file…” menu.

Keyboard: Space = Play/Pause, F = Fullscreen, M = Mute, ←/→ = Seek 5s, ↑/↓ = Volume, [ / ] = Subtitle offset −/+ 100ms, P = Picture-in-Picture.

Safari typically can’t play MKV; you may see a note to use Chrome/Edge/Firefox. Transmuxing and subtitle extraction require CORS access to the remote file.