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MKV to MP4 converter

Change an MKV into an MP4 that phones, smart TVs, iMovie and Premiere open without fuss.

Runs in your browser. Your file is never uploaded.

How to convert MKV to MP4

  1. 1Drop one or more MKV files into the box above.
  2. 2Keep MP4 and the original resolution for the fastest conversion.
  3. 3Select Convert and download the MP4.

What you get

  • If the MKV already holds H.264 video and AAC sound and you keep the original resolution, the tracks are copied into the MP4 as they are. That takes seconds and loses nothing.
  • Anything else is re-encoded to H.264 with AAC sound, which plays on every phone, computer, TV and website.
  • The main video and the first sound track are kept. Subtitle tracks, extra audio languages and chapters are left out.
  • Up to 3 files at a time free, or 30 with Pro.

Limits

  • Free, with or without an account: files up to 500 MB, 3 at a time.
  • With Pro: files up to 2 GB, 30 at a time.
  • Big files are read from your disk as they're processed, so they don't need to fit in memory, but a phone takes longer than a computer.

What happens to your file

Your file never leaves your device. The conversion runs in your browser using code from our site, and we don't receive the file, its name or anything inside it. How we handle files.

MKV to MP4: common questions

Is this MKV to MP4 converter free?
Yes. Files up to 500 MB convert free, without an account and without a watermark. Pro raises the limit to 2 GB a file and converts up to 30 files at a time.
Are subtitles kept?
No. Only the video and the first sound track go into the MP4. If you need subtitles, keep the MKV, or burn them in with a desktop app before converting.
My MKV has several languages. Which one do I get?
The first audio track in the file, which is usually the original language.
Is my video uploaded?
No. The conversion runs in your browser, so the video stays on your device and never reaches our server. Once the page has loaded it keeps working if your connection drops.
Why does the first conversion take a few seconds to start?
The converter is a copy of FFmpeg that runs in your browser. It's about 31 MB, so it downloads the first time you use it and your browser keeps it for next time.

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