Turn an MKV into an MP4 that plays anywhere — phones, TVs, editors. Free, no watermark, and 100% in your browser.
How to convert MKV to MP4
Drop your MKV above — it is read locally and never uploaded.
Leave Convert to on MP4 and pick a target size if you also want it smaller.
Click Compress and download the MP4.
Why convert MKV to MP4?
MKV is a great container but barely anything plays it — iPhones, most TVs, Premiere and social uploads all expect MP4. The video inside is usually already H.264, so converting is mostly a re-wrap and the quality holds up.
Will I lose quality?
Very little. The picture is re-encoded once at the bitrate your target allows; leave the target generous and the difference is hard to see.
Does it handle subtitles?
Subtitle tracks inside the MKV are not carried over — the output is video plus audio. The desktop app handles subtitle burn-in.
Is it private?
Yes. The file is decoded and re-encoded in your browser; nothing is uploaded.