Convert · MKV → MP4
Convert MKV to MP4 — right in your browser
Drop an .mkv (Matroska) file and get a standard .mp4 that plays on phones, smart TVs and in editors that refuse MKV. It's converted on your own device and never uploaded.
Why convert MKV to MP4?
MKV is a flexible container popular for high-quality video, but lots of phones, TVs, browsers and editors won't open it. MP4 (H.264) is the universal default, so converting makes the same video play almost everywhere.
Most converters upload your clip to a server first. VidKit doesn't — the conversion runs locally in your browser, so even large MKV files convert without a slow upload, and nothing is stored or logged.
Frequently asked questions
Is my .mkv file uploaded anywhere?
No. The conversion happens entirely in your browser, on your own device. There's no server that could receive the file — watch your browser's Network tab while it runs and you'll see zero bytes leave.
Will the MP4 lose quality?
Converting re-encodes the video, so there's some loss, but at the default settings it's hard to spot. You can also choose a target size or a quality level before converting.
What about big movie-length MKV files?
On Chrome or Edge, files up to about 2 GB are supported. Larger files on other browsers may be declined with a clear message rather than failing silently — try Chrome for the biggest files.