PlantUML for GitHub is a Chrome extension designed to enhance the GitHub experience by rendering PlantUML code blocks directly on pages. Utilizing a client-side TeaVM-compiled PlantUML engine, this extension operates without requiring any server-side support, ensuring a seamless integration with GitHub. Users can view their sequence, class, and activity diagrams in SVG format, which are displayed inline within the GitHub interface. The extension also features a toggle button, allowing users to switch between the rendered diagram and the original PlantUML source code, complete with GitHub's syntax highlighting.

Security is a key focus of the PlantUML for GitHub extension, as it requires zero permissions, operates without tracking, and runs entirely in a sandboxed iframe. The extension is designed to be lightweight and efficient, addressing long-standing requests for PlantUML support on GitHub without incurring additional infrastructure costs. Future updates aim to introduce features such as Firefox support and enhanced user options, making this tool a valuable addition for developers and diagram enthusiasts alike.