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MP4 · MOV · MKV · H.265 / HEVC
0 = whole video; set a start time and duration to convert only a clip.
The first run downloads a ~31 MB transcoding engine (cached afterwards).
Convert MP4, MOV, MKV or AVI video into WebM (VP8 + Opus) that plays in every modern browser — including the H.265/HEVC files that Chrome and Firefox refuse to play. Everything runs locally through a WebAssembly build of FFmpeg, so your video is never uploaded. The first conversion downloads a ~31 MB engine, which is then cached.