Convert MKV to MP4 Online Free
Drop an MKV file below to convert it to MP4 — entirely in your browser. Nothing is uploaded.
Drop an MKV file here
or click to browse — up to 2GB, processed on your device
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Nothing uploaded, ever. Your MKV is decoded and re-encoded to MP4 locally, inside this browser tab.
Why convert MKV to MP4?
MKV (Matroska) is a flexible container often used for downloaded movies, TV rips, and files with multiple audio tracks or subtitles baked in. It's great for storage and archiving, but far less universally supported for playback — many phones, smart TVs, game consoles, and streaming apps expect MP4 instead. Converting to MP4 makes the file playable almost everywhere without needing a special media player.
- Play a downloaded MKV movie or show on a phone, tablet, or smart TV
- Upload MKV footage to a platform that only accepts MP4
- Simplify a file for sharing with someone whose player doesn't support MKV
Because conversion happens entirely on your device, there's no upload wait — even large video files convert without leaving your browser tab.
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Frequently asked questions
MKV is a flexible container format popular for downloaded movies and TV rips, but many phones, smart TVs, and streaming apps only support MP4 natively. Converting to MP4 fixes playback on those devices. Compare formats in our MP4 vs MOV vs WebM vs MKV guide.
This tool converts the primary video and audio track. MKV files with multiple audio tracks, embedded subtitles, or chapter markers may not carry all of that extra data over into the MP4 output.
No. Conversion runs entirely in your browser on your own device. The file is never uploaded to a server. See our Privacy Policy.