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MKV to MP4 Converter

Convert MKV files to MP4 without installing software or uploading anything. If your MKV contains H.264 or HEVC (H.265) video, Smart mode copies it into the MP4 in seconds; other codecs are re-encoded to H.264.

  • Free, no sign-up
  • Files never leave your device
  • Powered by FFmpeg
  • No watermark
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Your files are processed on this device and are never uploaded to a server.

What happens when you convert MKV to MP4

Inside a typical MKVH.264, HEVC (H.265) or VP9 video with AAC, AC-3 or Opus audio
Copy without re-encodingSometimes: it depends on the codec inside your file, and Smart mode checks this automatically
When re-encodedH.264 video with AAC audio
Extra tracksOnly the first video and audio track are kept; extra audio tracks and subtitles are dropped
Opens inevery phone, browser, TV, editor and social network

Sizes are typical values; your files will vary with content and settings.

MKV

MKV Matroska Video

MKV is an open container that can hold almost any codec plus multiple audio tracks and subtitles. It is popular for archived films and series.

MKV converter
MP4

MP4 MPEG-4 Part 14

MP4 is the universal video container. With H.264 video and AAC audio it plays on every phone, browser, smart TV and social network, which makes it the safest choice for sharing.

MP4 converter

How to use the MKV to MP4 Converter

  1. 1

    Choose a MKV file or drop it onto the page.

  2. 2

    Review the video options. The defaults suit most files.

  3. 3

    Click Convert and download your MP4 when processing finishes.

Why convert MKV to MP4?

MKV is common for films, TV episodes and OBS recordings, because one file can hold several audio and subtitle tracks. iPhones, browsers and most social networks will not play MKV files. Choose MP4 to upload to social media, send in a chat app or play on any phone and TV.

Frequently asked questions

Will the MP4 lose quality?

Both formats are lossy, so converting re-encodes the data once more. Using a high quality setting keeps the generational loss very small. Avoid converting the same file back and forth repeatedly.

Does converting MKV to MP4 re-encode the video?

Sometimes: it depends on the codec inside your file, and Smart mode checks this automatically. A typical MKV contains H.264, HEVC (H.265) or VP9 video with AAC, AC-3 or Opus audio. Otherwise the result is H.264 with AAC audio.

Questions about privacy, file-size limits or conversion speed are answered in the general FAQ.