Convert MKV to MP4
Free, private MKV to MP4 conversion - processed entirely in your browser, nothing is uploaded.
MKV (Matroska) is a flexible container popular for high-quality rips and OBS recordings, but smart TVs, iPhones, browsers, and most tablets refuse to play it. Converting to MP4 keeps the video watchable everywhere without hunting for a special player. The re-encode to H.264/AAC happens right in your browser - nothing is sent to a server, which matters for personal recordings.
Drop a video here
or click to browse. Convert between MP4, WebM, MOV, MKV, and AVI.
Frequently asked questions
Will subtitles and multiple audio tracks survive the conversion?
No - MP4 output keeps one video and one audio track, and soft subtitle tracks are dropped. MKV's multi-track flexibility is exactly what MP4 trades away for compatibility. Keep the original MKV if you need the extra tracks.
Why did OBS record my stream as MKV?
OBS defaults to MKV because the file stays playable even if the recording crashes mid-write - MP4 corrupts in that case. Converting after the fact gives you crash-safe recording plus a shareable file.
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MOV to MP4
Turn iPhone and Mac MOV videos into MP4 files that play everywhere - Windows, Android, and the web. Free, in-browser, nothing is uploaded.
WebM to MP4
Convert WebM screen recordings and downloads to MP4 for editing apps, iPhones, and social media. Free and processed entirely in your browser.
Convert Video
All formats - MP4, WebM, MOV, MKV, and AVI