Convert MKV to MP4
Convert MKV to MP4 online free. Fast, private and in your browser — no upload, no sign-up and no watermark. Batch MKV→MP4 conversion that works on any device.
To convert MKV to MP4, drop your MKV file into the converter above, then download the MP4 result. It's free, needs no sign-up, and there's no watermark. Conversion runs in your browser with on-device FFmpeg, so your files never leave your device.
Why convert MKV to MP4?
Convert MKV to MP4 so your video plays in browsers, on phones and on TVs that don't support Matroska. MP4 is the most broadly compatible container, making MKV files easy to stream, upload and share.
- Playing MKV on devices that won't open it.
- Uploading to platforms that reject MKV.
- Getting a single, portable, streamable file.
MKV vs MP4
MKV · Matroska Video
MKV (Matroska) is a flexible open container that can hold many video, audio and subtitle tracks in one file. It's popular for archiving, but doesn't play natively in many browsers or on some TVs.
MP4 · MPEG-4 Part 14 (H.264)
MP4 with H.264 video is the most universally compatible video format — it plays everywhere and uploads cleanly to YouTube, Instagram, TikTok and messaging apps.
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Video Converter
Convert video to MP4, WebM, MOV, MKV, GIF or MP3.
Open Video ConverterMKV to MP4 — frequently asked questions
How do I convert MKV to MP4?
Drop your MKV file (or several) into the converter, confirm MP4 is selected as the output, click convert, then download the MP4 file. The whole thing takes a few seconds.
Is this MKV to MP4 converter free?
Yes — it's completely free with no watermark and no sign-up required.
Is it safe to convert MKV to MP4 here?
Yes. Conversion runs on-device with FFmpeg compiled to WebAssembly, so your MKV file is never uploaded to a server.
Can I convert multiple MKV files at once?
Add your MKV file and convert it, then repeat for the next one — each runs locally in your browser.
Does it work on mobile?
Yes — the converter runs in any modern browser on phones, tablets and desktops.