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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.
⚡ Runs entirely in your browser via ffmpeg.wasm. The engine (~30 MB) downloads on first use; large files are slow and limited by your device's memory. Nothing is uploaded.
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Click or drop a video to convert
Processed locally in your browser — never uploaded.
🔒 This tool runs entirely in your browser. Your data is never 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.