How to Use Video Converter
Convert videos between MP4 (H.264), WebM (VP9) and MKV using ffmpeg.wasm — local and private. WebM is smallest but slower to encode.
Open the Video Converter tool →What is Video Converter?
Convert video between MP4, WebM and MKV in your browser. It's completely free, needs no sign-up, and runs entirely in your browser — so it's fast and private.
How to use Video Converter
- Open the Video Converter tool.
- Add your media file.
- Choose your export settings.
- Process and download the result. Everything runs in your browser — nothing is uploaded.
Frequently asked questions
Which formats are supported?
MP4, WebM and MKV, converted in your browser with ffmpeg.wasm.
Why does conversion take a while?
Video encoding is heavy and runs locally via WebAssembly, so larger or longer files take longer and use more memory.
Are my videos uploaded?
No — everything is processed on your device; your video never leaves the browser.
Ready to try it?
Open Video Converter →