So you asked Claude to animate something. Maybe a logo, a loading screen, a data viz. It spat out a neat HTML file with CSS keyframes, everything looks crisp in the browser — and now you need it as an MP4.
The obvious approach is screen recording. Open QuickTime or OBS, hit record, play the animation, stop, trim. Works, kind of. Except it's not frame-perfect. If your machine lags for half a second, that lag is baked into the video. The animation runs at whatever speed your CPU felt like that afternoon. Completely non-deterministic. And the moment you tweak something — wrong colour, timing off by 200ms — you're setting the whole thing up again, which is just tiring. Not to mention that every time you hit record you start at a slightly different frame, so swapping the asset in your video editor becomes a pain because nothing lines up the same way twice.
There's a better way.
You can use htmlrec — a CLI tool that renders HTML animations to video frame by frame, without touching your screen. It controls the browser clock directly, so every frame is captured at exactly the right moment regardless of your machine's load. Pixel-perfect, every single time.
Install it with:
