Developer utilities · by Excalidraw s.r.o.

Excalidraw

A free in-browser whiteboard for quick hand-drawn-style diagrams and sketches, with live collaboration and export to PNG, SVG or its JSON scene format; the editor is also an MIT React component.

Diagrams look like napkin sketches, which makes architecture drawings feel friendly, and the scene file is plain JSON a program can generate.

Commercial OK

Open excalidraw.com ↗ agent.md

For your project

Official API: No official API
Data download: No bulk download found
License: MIT (editor code); site Terms of Use for drawings Drawings you make in the editor: free for commercial use; editor code: MIT. Embed via the npm package, not by framing the site.
Commercial use: Commercial use OK
“You are allowed to use or distribute such drawings in any way you see fit, for both commercial and non-commercial purposes. This includes the installed libraries and the default fonts you use in your drawings.” plus.excalidraw.com/terms-of-service
Credit: Not stated
Embedding: Embedding unclear
Using the website: Free tier

Read on Excalidraw's own pages on Oct 23, 2026 · license or terms · API docs. Check the license page before you ship.

For your agent

No official API. An agent should not scrape the site: use it by hand.

Open source (MIT, github.com/excalidraw/excalidraw) with an official npm package @excalidraw/excalidraw (React component plus export helpers) and @excalidraw/mermaid-to-excalidraw; the repo ships a Dockerfile for self-hosting; there is no HTTP API, so generate .excalidraw JSON scenes or use the official MCP server.
Keep the MIT copyright notice when bundling the editor code
Embed the editor with the npm package rather than iframing excalidraw.com (the terms forbid unauthorized framing)
Do not scrape the site

· MCP: https://mcp.excalidraw.com (repo: https://github.com/excalidraw/excalidraw-mcp, MIT)

Paste into your agent: Read https://agentgid.com/resources/excalidraw/agent.md before using Excalidraw.

What you can build

Diagrams your agent can drawLet your app or agent produce editable hand-drawn diagrams by writing Excalidraw scene JSON, and show them with the open-source editor component.

A docs site that renders architecture diagrams from .excalidraw JSON files stored next to the code
An 'explain this system' agent tool that turns a Mermaid diagram into an editable Excalidraw scene
An in-app whiteboard for a SaaS product using the MIT React component

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