Space for your ideas.

Sketch, explain, and think together. Whiteboard is a free, open-source canvas by Lumin.

In Codex desktop, whiteboards are ordinary .excalidraw files in your chat’s workspace. Our hosted service delivers the editor. It doesn’t store your drawings.

Development preview. In a browser or on mobile, import a file from the menu and download your work before leaving. Automatic saving to a chat file requires the Codex desktop file integration.