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Convert MKV to MP4

Remux MKV → MP4, usually without re-encoding

Turn an MKV into a standard MP4 in your browser. MKV usually holds H.264/H.265 video that MP4 supports directly, so this is typically a lossless remux — fast, no quality loss, nothing uploaded.

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Remux, not re-encode

The video inside an MKV is usually already MP4-compatible — it's moved into the new container untouched, keeping full quality.

Nothing uploaded

Your video is processed entirely on your device — it never leaves your browser and nothing is stored on a server. Watch the network tab: no upload.

Free, no watermark, no caps

No account, no watermark, no length or file-size tiers, no daily limit. The things other video sites paywall are simply free here.

How to do it

  1. 1Drop in the .mkv file.
  2. 2Optionally trim.
  3. 3Export the .mp4 — it now plays on TVs, phones and editors that reject MKV.

FAQ

Why do so many devices reject MKV?

MKV is a flexible container that many TVs, phones and editors never adopted. The video inside is usually fine — MP4 just packages it in the format everything understands.

Is MKV to MP4 lossless?

Usually yes — the video and audio streams are copied over unchanged. Only exotic codecs trigger a re-encode, which then runs on your device at high quality.

Are my files uploaded?

Never — the remux happens in your browser.

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All free, no watermark, nothing uploaded — your hardware does the work. Open the full Video Studio →