Convert MP4 to MKV

Upload your MP4 file (MPEG-4 video) and get it back as MKV (Matroska video) in seconds.

How to convert MP4 to MKV

  1. Choose your MP4 file, or drop it on this page.
  2. Check that MKV is selected as the output format.
  3. Click Convert, then download your MKV file.

Questions and answers

Is it free to convert MP4 to MKV?
Yes. You can convert up to 5 files a day for free, without an account.
Are my files safe?
Your upload is deleted as soon as the conversion finishes, and the result 15 minutes later. Nobody looks at your files.
How big can my file be?
Up to 50 MB per file on the free plan.

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