MKV to MP4 Converter
Free, no sign-up. Your video never leaves your device.
Frequently asked questions
What's the difference between MKV and MP4?
MKV (Matroska) is a container that can hold several audio and subtitle tracks. MP4 is simpler, but virtually every phone, TV, editor and website understands it.
What happens to tracks and subtitles?
The main video track and the main audio track go into the MP4. Other audio tracks and subtitles are not carried over.
Why does the MP4 have no sound?
Movies in MKV often have AC-3, E-AC-3 or DTS audio, which browsers can't decode. In that case the video is saved without sound and the file's row shows a warning.
Why does it take a while?
Re-encoding video is heavy work, and it happens right on your device. A minute of video takes from tens of seconds to a few minutes, depending on resolution and your computer. Progress is shown as a percentage.
How do I make the file smaller?
Choose “Medium” or “Low” quality and a smaller frame size — 720p or 480p. 720p means the short side of the frame is 720 pixels: for a vertical video that's the width.
Which browsers does it work in?
Up-to-date Chrome, Edge, Firefox and Safari: video is encoded with the browser's built-in codecs (WebCodecs). If your browser lacks a codec, the file's row will tell you.
Is it safe?
Yes. Only the converter itself is loaded from the site; your video is processed in your browser and never sent to a server.