David Luzar
74423812ec
perf(element): reuse one moved-element ID set when dragging dragSelectedElements passed a fresh Array.from(elementsToUpdate) to every element's updateBoundElements call. Each call missed the per-array ID-set cache and rebuilt a selection-sized set, so a drag step was quadratic in the number of dragged elements. Build the array once per drag step, pass it to every call, and reuse its cached set (getSimultaneouslyUpdatedElementIds, now exported) for the unbinding checks too. Document that callers must pass one array instance per operation and must not change its membership afterwards. Dragging 1K / 2K / 4K selected rectangles in the app went from 45 / 160 / 643 ms to 18.5 / 31 / 54 ms per frame (same tab, same window, dev build). Add coverage for the shared array, grouped labels across z-order, frames with their children, bound arrows, bindings, unbinding, and unchanged coordinates. Claude Opus 5.5 (1M context), reasoning effort 40
Excalidraw Editor | Blog | Documentation | Excalidraw+
An open source virtual hand-drawn style whiteboard.
Collaborative and end-to-end encrypted.
Create beautiful hand-drawn like diagrams, wireframes, or whatever you like.
Features
The Excalidraw editor (npm package) supports:
- 💯 Free & open-source.
- 🎨 Infinite, canvas-based whiteboard.
- ✍️ Hand-drawn like style.
- 🌓 Dark mode.
- 🏗️ Customizable.
- 📷 Image support.
- 😀 Shape libraries support.
- 🌐 Localization (i18n) support.
- 🖼️ Export to PNG, SVG & clipboard.
- 💾 Open format - export drawings as an
.excalidrawjson file. - ⚒️ Wide range of tools - rectangle, circle, diamond, arrow, line, free-draw, eraser...
- ➡️ Arrow-binding & labeled arrows.
- 🔙 Undo / Redo.
- 🔍 Zoom and panning support.
Excalidraw.com
The app hosted at excalidraw.com is a minimal showcase of what you can build with Excalidraw. Its source code is part of this repository as well, and the app features:
- 📡 PWA support (works offline).
- 🤼 Real-time collaboration.
- 🔒 End-to-end encryption.
- 💾 Local-first support (autosaves to the browser).
- 🔗 Shareable links (export to a readonly link you can share with others).
We'll be adding these features as drop-in plugins for the npm package in the future.
Quick start
Note: following instructions are for installing the Excalidraw npm package when integrating Excalidraw into your own app. To run the repository locally for development, please refer to our Development Guide.
Use npm or yarn to install the package.
npm install react react-dom @excalidraw/excalidraw
# or
yarn add react react-dom @excalidraw/excalidraw
Check out our documentation for more details!
Contributing
- Missing something or found a bug? Report here.
- Want to contribute? Check out our contribution guide or let us know on Discord.
- Want to help with translations? See the translation guide.
Integrations
Who's integrating Excalidraw
Google Cloud • Meta • CodeSandbox • Obsidian Excalidraw • Replit • Slite • Notion • HackerRank • and many others
Sponsors & support
If you like the project, you can become a sponsor at Open Collective or use Excalidraw+.
Thank you for supporting Excalidraw
Last but not least, we're thankful to these companies for offering their services for free:
