Framecast

Framecast is a straightforward web tool that converts HTML animations into MP4 video files. You drop in an HTML file — say, a Claude-generated animation with CSS, GSAP, canvas, or SVG — and get back a video ready for YouTube, TikTok, or Instagram Reels. It's not a screen recorder; it renders each frame on a virtual clock, so the output is deterministic and free of dropped frames or tearing. The service outputs three aspect ratios (16:9, 9:16, and 1:1) from a single upload, saving you the hassle of re-exporting for different platforms.

Behind the scenes, Framecast advances a frame-by-frame clock rather than capturing real-time playback. This means the render speed doesn't depend on your CPU's ability to keep up — the engine captures every frame exactly as designed, up to 4K resolution. The interface is minimal: drag and drop your HTML file, choose your format, and wait for the MP4. A watermarked preview is free; the full, watermark-free video costs a one-time $2.99 per render. No subscription, no hidden fees.

This tool is most useful for developers and designers who prototype animations in code (especially with Claude or other AI coding assistants) but need a video file to share on social media or embed in presentations. It also helps content creators who want to repurpose web-based motion graphics for short-form video platforms. If you've ever built a cool CSS animation and wished you could post it as a reel, Framecast solves that specific problem without any video editing skills required.