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mp4mkv

MP4 to MKV Converter

Convert MP4 video to MKV in your browser — no upload, no watermark.

To convert MP4 to MKV, drop your video in and choose a quality. The conversion runs through FFmpeg compiled to WebAssembly inside your browser, so the file is never uploaded and there is no size cap beyond your available memory. MKV is a container rather than a codec — it holds almost any stream, plus multiple audio tracks and subtitles, which is why it is common for archived media.

Runs in your browser

About converting MP4 to MKV

MKV is a container rather than a codec — it holds almost any stream, plus multiple audio tracks and subtitles, which is why it is common for archived media. Because the encode happens on your own machine, expect roughly real-time speed for 1080p — a five-minute clip takes about five minutes. That is the trade for not uploading it.

Convert MKV to MP4 insteadOpen the full Video Converter

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