ReRender - PlantUML Renderer

Fast PlantUML renderer for your browser. Create activity, sequence and timing diagrams easily and privately without a server.

If you have any feedback on the extension, we'd greatly appreciate hearing from you. Please share your thoughts at info@chirila.ch. As we're still in the early releases, your feedback is invaluable in helping us identify bugs, improve the experience, and prioritize new features. Thank you for your support! 🔄 LATEST CHANGES v1.0.20 - September 21, 2026 - Added full support for Use Case diagrams, including actors, use cases, stereotypes, containers, headers, titles, and notes. - Added support for embedded JSON blocks within Use Case diagram elements. v1.0.19 - September 8, 2026 - Added support for `!pragma sequenceMessageSpan` to control message text spanning across lifelines in Sequence diagrams. - Implemented custom header/tab colors (`alt#Color #BackgroundColor`) for group diagram elements. v1.0.18 - September 7, 2026 - Added support for label and goto flow redirection in Activity diagrams. - Implemented timeline-accurate rendering for parallel blocks and fixed styled text positioning. - Added support for association classes in diagram rendering and layout engines. 🚀 WHY RERENDER? - Lightning-fast PlantUML rendering optimized for the web. - Runs entirely in your browser with no server connection required. - Modern, reactive editor with instant live previews. ✨ FEATURES - Live Rendering: Instant visualization of Sequence, Activity, Timing, Class, MindMap, and WBS diagrams. - Modern UI: Clean, responsive interface with multiple themes (Classic, Nature, Matrix, OLED). - Complex Syntax: Full support for swimlanes, nested loops, and advanced flow control (detach/kill). - Private & Secure: All diagram data stays on your machine; no data is sent to a backend. - Pure Logic: Layout calculations performed entirely on the client-side for maximum privacy. 📝 DESCRIPTION ReRender is a high-performance, web-optimized PlantUML renderer. Unlike traditional tools that require a Java-based backend or cloud processing, ReRender parses and calculates diagram layouts directly in your browser using a custom local layout engine. It provides a reactive editing experience where users can visualize complex workflows, system architectures, and technical hierarchies in real-time. Key functionalities include advanced WBS modeling, complex activity parsing, and a modular architecture that ensures speed, privacy, and reliability. ⚠️ DISCLAIMER ReRender is an independent project and is not affiliated with, sponsored by, or endorsed by the official PlantUML project or its creators. It is a separate implementation of the PlantUML syntax designed for modern web and mobile environments.