MP4 to MKV

Convert MP4 videos to MKV in your browser. No upload required. Useful for flexible container workflows.

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Upload Video

Drag & drop or click to select a video file

How to convert MP4 to MKV

  1. Upload an MP4 file.
  2. Optionally trim the time range.
  3. Click Convert and wait for completion.
  4. Download the MKV file.

Privacy

By default, conversion runs locally in your browser. Your video is not uploaded to any server.

MP4 to MKV FAQ

Is this lossless?

The tool tries remux first. If it fails, it may transcode for compatibility.

Is my file uploaded?

No. The conversion runs locally by default.