Convert MKV to MP4
Convert MKV to MP4 free in your browser. No upload, no signup, no watermark. Files stay on your device.
drop a .mkv file
or click to browse
max 500 MBrelated
more mkv & mp4
see all video & audio converters →guide
how to convert mkv to mp4
Drop your MKV file
Drag your MKV file into the drop zone above, or click the box to pick a file from your computer or phone. The browser reads the file directly — nothing uploads.
Click Convert
The page runs ffmpeg.wasm on your device to decode the Matroska Video and encode it as MPEG-4 Part 14. Most conversions finish in a few seconds; large or codec-heavy files (RAW, video) can take longer.
Download the MP4 file
When the conversion finishes, the MP4 file is ready to download. Save it anywhere on your device.
FAQ
common questions
Why convert MKV to MP4?
MKV is popular for movies, TV episodes, and anime fan-subs but isn't supported everywhere. iOS Safari doesn't play MKV natively, many smart TVs and game consoles reject it, and most upload-to-share platforms expect MP4. Converting unlocks the content for those destinations.
Will I lose the extra audio tracks and subtitles?
Subtitles: usually yes — MP4 supports limited subtitle types compared to MKV (which holds SRT, ASS, PGS, etc.); only basic timed-text variants survive. Audio: the converter typically picks one audio track for the MP4 (usually the first or the one matching your system locale). MKV's strength is carrying many tracks; MP4 narrows down to the essentials.
Will the video quality stay the same?
Mostly — when the video codec inside the MKV is already H.264 or H.265, the converter re-muxes the codec stream into MP4's container without re-encoding. That's lossless. When the source uses VP9 (less common in MKV) or another non-MP4-compatible codec, the video gets re-encoded which adds a small generational loss.
What about chapter markers?
MKV chapters typically don't survive the conversion. MP4 does support chapter markers but in a different format that requires explicit conversion; most converters drop chapter data. For video files where chapters matter (audiobooks, long lectures, instructional videos), consider sticking with MKV.
Will the file size change?
Roughly the same when re-muxing. Container overhead for MKV and MP4 is similar. Slight differences come from dropped streams (multi-audio tracks, multiple subtitles) — losing those reduces the MP4 size. Re-encoding the video produces variable results depending on quality settings.