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Multi‑User Whiteboard (Local) - Online Shared Drawing

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1 user(s) online
Tool: Pen | Size: 3px Tip: Use Ctrl+Z to undo, Ctrl+Y to redo 1 online

Frequently Asked Questions

What is a Multi-User Local Whiteboard?
A multi-user local whiteboard allows multiple browser tabs or windows on the same device (or same origin) to draw and collaborate in real time on a shared canvas. It uses the BroadcastChannel API to instantly synchronize all drawing operations across open instances without needing a server.
How does local sharing work?
Local sharing uses the browser's built-in BroadcastChannel API. When you draw something, the operation is instantly broadcast to all other open tabs of the same tool. Each tab maintains an identical operation history, ensuring all canvases stay perfectly synchronized in real time.
Can I use this whiteboard offline?
Yes! This whiteboard works completely offline. All drawing data stays on your device. The local sharing feature works between tabs on the same device without any internet connection required.
What drawing tools are available?
The whiteboard includes a freehand pen, eraser, straight line, rectangle, circle, and text tool. You can customize stroke color, line thickness, and toggle shape fill. All tools support undo/redo and are synchronized across tabs.
How do I export my drawing?
Click the download button in the toolbar to export your current canvas as a high-resolution PNG image. The export preserves the full quality of your drawing with a white background.
How many users can collaborate simultaneously?
There is no hard limit on the number of simultaneous users. The BroadcastChannel API efficiently handles many tabs, though practical limits depend on your device's performance. Typically, 5-15 concurrent tabs work smoothly.
Is my drawing data saved when I close the browser?
Drawing data is stored in memory and via the operation history. When all tabs are closed, the canvas state is lost. To preserve your work, use the export function to save your drawing as a PNG file before closing.
Does this work on mobile devices?
Yes! The whiteboard is fully responsive and supports touch input on smartphones and tablets. You can draw with your finger or a stylus. The toolbar adapts to smaller screens for comfortable mobile use.
What browsers support this whiteboard?
All modern browsers support this tool: Chrome 54+, Firefox 38+, Edge 79+, Safari 15.4+, and Opera 41+. The BroadcastChannel API is widely supported across all major browsers.
How do I undo a mistake?
You can undo your last action by clicking the undo button (arrow rotating left) in the toolbar or pressing Ctrl+Z (Cmd+Z on Mac). Redo is available via Ctrl+Y (Cmd+Shift+Z on Mac) or the redo button. Undo/redo works across all connected tabs.
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