PlantUML

🧩 New! Render PlantUML diagrams directly inside GitHub with our official browser extension — No server. No tokens. No tracking. Zero permissions but clipboard. 💬 Want native PlantUML support in GitHub? Upvote and join the discussion: Support for PlantUML diagrams 🤖 New! Give your AI assistant the power to render and check PlantUML diagrams with @plantuml/mcp-js — a pure Node.js MCP server. No Java. No server. Just npx @plantuml/mcp-js . PlantUML is a component that allows you to create various UML diagrams through simple textual descriptions. From sequence diagrams to deployment diagrams and beyond, PlantUML provides an easy way to create visual representations of complex systems. PlantUML can be compiled to JavaScript with TeaVM to run entirely client-side in the browser, with no server required. To produce the JavaScript artifacts and use them in your own project: The -Pfast flag skips the slow parts of a regular build (tests, Javadoc, JaCoCo) so you only get the TeaVM output. The viz-global.js file provides Viz.js (Graphviz) support for diagrams that rely on Dot layout. The teavm task also copies the PlantUML stdlib bundles and a ready-to-use index.html demo into ./build/generated/teavm/js/ . For a live example of client-side rendering, see the JavaScript PlantUML Demo. PlantUML is an open-source project, and we welcome contributions of all kinds. Whether you're helping us fix bugs, improve the docs, or spread the word, we appreciate your support. See our contributing guide for more information on how to get started. For comprehensive and detailed documentation on using PlantUML, refer to the official Javadoc, available here. Please note that this documentation is a work in progress and may not be complete. For more information, please refer to the PlantUML license FAQ to help determine which license is appropriate for your use case.