Convert MKV to MP4

How it works

1. 1

   Add your MKV file

   Drop, pick, or paste it. It stays on your device.

2. 2

   Convert

   We re-encode it to MP4 right here in your browser.

3. 3

   Download

   Save the MP4 file.

MKV is a good container that nothing will accept

MKV is technically the most capable of the common containers. It will happily carry several audio tracks, a stack of subtitle tracks, and chapters, all in one file, which is why it is the format of choice for archiving. It is also refused by nearly every website, most phones, and a good number of players.

That leaves people converting perfectly good files for no reason, because the video inside an MKV is very often plain H.264 with AAC audio, which is exactly what an MP4 holds. Nothing needs to be re-encoded. The streams can be lifted straight out and rewrapped, which takes seconds and loses nothing at all.

If your MKV has several audio tracks or embedded subtitles, be aware that a rewrap into MP4 will not carry all of that across cleanly, since MP4 is a simpler container. That is the one case where MKV's extra capability actually costs you something on the way out.

Why nothing uploads

Other tools send your video to their servers, which costs them money per file, so they add watermarks, cap file sizes, and make you sign up. This tool does the work right here in your browser using your own device. Your file is never uploaded, so there is no wait, no watermark, no size limit, and no account.

Questions

Why will nothing play my MKV?

Nothing is wrong with the file. MKV is simply not supported by most websites, phones, and players, even when the video inside it is completely ordinary.

Do I lose the subtitles?

Embedded subtitle tracks do not survive a rewrap into MP4 cleanly. If you need them, burn them into the picture with the subtitle tool first.

Why is this so much faster than other converters?

Because most MKV files do not need converting, only rewrapping. Sites that re-encode every file regardless are doing minutes of work that was never necessary.

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