Conversion is powered by FFmpeg, the open-source command-line tool for working with audio, video, and image files.

FFmpeg has been compiled to WebAssembly via the ffmpeg.wasm project, which lets it run entirely inside your browser — no server, no upload. This app loads @ffmpeg/ffmpeg and @ffmpeg/core (the ~32 MB engine) from unpkg on first use.

The wasm core in use is built with --enable-gpl (libx264, libx265, libvpx, libmp3lame, libvorbis, libopus, libwebp, …), so it falls under the GNU General Public License, version 2 or later. Source for FFmpeg: ffmpeg.org/download.html. Source for ffmpeg.wasm: github.com/ffmpegwasm/ffmpeg.wasm.

Full license text (GPL v2):

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