Video Format Converter

About Video Format Converter

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.

How to Use Video Format Converter

Convert video files between formats like MP4, WebM, and MKV privately in your browser using FFmpeg WebAssembly.

1. 1

   Open the Video Format Converter tool

   Navigate to the Video Format Converter page to initialize the FFmpeg WebAssembly engine in your browser.

2. 2

   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.

3. 3

   Choose your desired output format

   Select your target format such as MP4, WebM, MKV, or AVI from the available conversion options.

4. 4

   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.

5. 5

   Download your converted video file

   Once the conversion is complete, save the newly formatted video file directly to your device.

Estimated time: PT2M

Frequently Asked Questions

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Video Format Converter: Convert MP4, WebM, MKV & AVI Online

Convert video files between MP4, WebM, MKV, and AVI formats directly in your browser. Fully private, no server uploads, powered by FFmpeg WebAssembly.