Nothing is uploaded. The file is read from disk, FFmpeg runs in WebAssembly, and the result is handed back as a blob. The engine is about 10 MB compressed, fetched once and cached. The core is single-threaded because the threaded build needs COOP/COEP headers, so a 10-second 720p clip takes a few seconds rather than a fraction of one. No size caps, no queue, no account.

Two optional server features: "Get a link" hosts a finished file if you want to paste it in a forum, and a WhatsApp sticker page can deliver a sticker to your phone. Both are off until you press the button.

The glue code on the page is plain JS; the FFmpeg build is the unmodified @ffmpeg/core 0.12.6 (GPL, libx264 and libx265 included). I would like to hear where it breaks, especially on Safari, and which tool you are missing.

Comments URL: https://news.ycombinator.com/item?id=50260972

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