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Convert video files between MP4, WebM, MKV, AVI and more. No upload needed.
Convert video files between formats directly in your browser using FFmpeg WebAssembly — no upload, no server, fully private. Supports any input format (MP4, WebM, MKV, MOV, AVI, FLV, and more) and outputs to MP4, WebM, MKV, or AVI. The WASM engine (~32 MB) is downloaded once and cached for future use.
Convert video files between formats like MP4, WebM, and MKV privately in your browser using FFmpeg WebAssembly.
Open the Video Format Converter tool
Navigate to the Video Format Converter page to initialize the FFmpeg WebAssembly engine in your browser.
Select your local video file
Click the upload area to choose a video file from your device; the file remains private and is never uploaded to a server.
Choose your desired output format
Select your target format such as MP4, WebM, MKV, or AVI from the available conversion options.
Start the browser-based conversion process
Click the convert button to begin processing the file locally using your computer's resources via the WASM engine.
Download your converted video file
Once the conversion is complete, save the newly formatted video file directly to your device.
Estimated time: PT2M
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Drop a video here or tap to browse
MP4, WebM, MKV, MOV, AVI, FLV and more
Conversion runs entirely in your browser — files are never uploaded
