What Is HyperFrames?

HyperFrames is a free, open-source framework from HeyGen that turns HTML, CSS, media and seekable animations into MP4 video. You describe a video as an ordinary HTML page with a few timing attributes, and the renderer opens it in headless Chrome, captures it one frame at a time and encodes the result with FFmpeg. The project's own tagline is three short sentences: "Write HTML. Render video. Built for agents."

The last sentence explains the attention. HeyGen published the repository in March 2026 under the Apache 2.0 license, and it passed 70,000 GitHub stars in under eight months. Coding agents such as Claude Code, Codex and Cursor already write HTML well, so a video format that is just HTML is one they can produce without learning an editor. HyperFrames adds agent skills that teach them its rules, a CLI that never stops to ask questions, and a catalog of about 450 ready-made blocks.

It works without an agent too. You need Node.js 22 or newer and FFmpeg.…