Convert MKV to MP4
MKV is a flexible container that phones, TVs and editing apps often refuse to open. MP4 works almost everywhere. Convert it here, on your own device.
Your file stays on your device. Nothing is uploaded.
How to convert MKV to MP4
- Choose your MKV file.
- Pick "Plays everywhere" (H.264) or "Fastest".
- Press "Convert to MP4", check the preview and download.
Your video never leaves your device
The conversion runs in your browser. Nothing is uploaded, so there is no upload wait and no copy of your video on a server.
Frequently asked questions
Will my MKV keep its quality?
If the MKV holds H.264 or HEVC video, "Fastest" copies it into the MP4 untouched. Other codecs are re-encoded to H.264 at a similar bitrate.
Is it free? Is there a watermark?
It is free, adds no watermark and needs no sign-up.
"Plays everywhere" or "Fastest": which one should I pick?
"Plays everywhere" re-encodes the video to H.264, which every phone, computer and TV can play. "Fastest" keeps the original video when the MP4 format allows it, so it takes seconds and the quality is unchanged, but HEVC video may not play on older Windows PCs.
How big can my file be?
Up to 2 GB on desktop Chrome and Edge, 1 GB on desktop Safari and 500 MB on phones.