Convert MKV to MP4
Turn MKV files — OBS recordings, downloads, rips — into MP4s that play everywhere. Usually takes seconds with no quality loss.
Free · No signup · Files never leave your device
Drag and drop a video file
or click to browse
Compatible videos are repackaged in seconds without re-encoding — you'll see whether yours qualifies before converting.
How it works
Drop your MKV file
It stays on your device — nothing is uploaded.
Converted to MP4 locally
Compatible streams are repackaged right in your browser — usually done in seconds with zero quality loss.
Download the result
Preview the MP4 and download it — free, no watermark.
Frequently asked questions
Usually seconds. Most MKV files carry video and audio codecs that MP4 also supports, so the streams are repackaged into the new container without re-encoding — no quality loss, no long wait. The tool tells you before converting whether your file qualifies.
Usually not at all: when the codecs are compatible, the conversion just moves the same video and audio data into a new container — bit-for-bit identical quality. Only incompatible streams are re-encoded, and the tool tells you beforehand.
OBS records to MKV by default because the format survives crashes, but many editors, phones, and sharing platforms only accept MP4. Since OBS records H.264 video and AAC audio, the conversion is a pure repackage — instant and lossless.
MP4 has poor subtitle support, so embedded subtitle tracks are dropped during conversion — the first video and audio tracks are kept. If you need the subtitles, extract them separately before converting.
Yes. The converter is completely free, with no signup, watermarks, or limits. We make money from our video translation service, not from this tool.
No. The conversion happens locally in your browser using WebAssembly. Your file never leaves your device — you can even disconnect from the internet once the page has loaded.