Excalidraw: Free Online Whiteboard, No Login Required

Opens to a blank canvas with no signup, login, or email prompts.

Browser-based drawing tool that renders shapes and lines in a hand-drawn style.

Tools include rectangles, circles, arrows, lines, text, freehand drawing, and embedded images; objects can be grouped, layered, locked, and aligned to a grid.

Export as PNG (optional transparent background), SVG, or copy to clipboard; .excalidraw files are plain JSON and recoverable without the app.

Collaboration is end-to-end encrypted by default — room ID and key stay in the URL fragment, servers relay only encrypted bytes and cannot read content; this privacy guarantee contrasts with platforms that have full access.