Convert MKV to MP4 offline, for free

How to convert MKV to MP4

1. Download nxtconvertIt’s free for macOS, Windows and Linux. Install it like any other app.
2. Add your MKV filesDrag them onto the window, or click Browse files. You can add as many as you like.
3. Choose MP4Pick MP4 in the format menu next to each file, or use “Set all to” for the whole batch.
4. ConvertPress Convert. Your MP4 files appear in Downloads/nxtconvert, and the originals stay untouched.

MKV and MP4

MKV is a flexible container that can hold many audio and subtitle tracks. Some players and editors don’t accept it.

MP4 with H.264 video plays on virtually every phone, browser, TV and editor.

In Settings you can cap the resolution (4K down to 480p) and choose High, Balanced or Small file quality.

Why convert on your computer?

Online converters upload your MKV files to someone else’s server, limit file sizes and often add queues or watermarks. nxtconvert does the work locally with the same engines professional tools use, so it’s private, works offline and handles large files and big batches.