Browser transcoding is CPU-heavy.

See on-page ffmpeg.wasm support.

Yes; heavy tasks better on desktop Wi-Fi.

Yes—copy text or download files as supported.

Video Format Converter

Convert between MP4, WebM, MKV, GIF, M4A, WAV, and more—locally via ffmpeg.wasm。 Runs locally—nothing uploaded.

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How to use & FAQ

Video Format Converter: Convert between MP4, WebM, MKV, GIF, M4A, WAV, and more—locally via ffmpeg.wasm. Uses ffmpeg.wasm locally—video not uploaded.

First run may download wasm; prefer desktop for large files.