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Ctrl+scroll to zoom · Space+drag to pan · Dbl-click to edit
Online Whiteboard & Diagram Sketching Tool
io9.me Whiteboard is a lightweight, browser-based drawing tool for quickly sketching diagrams, wireframes, flowcharts, and notes. It runs entirely in your browser with zero setup — no accounts, no installs.
Features
- Freehand pen drawing with adjustable stroke width and color
- Arrow tool for connecting elements in flowcharts
- Rectangle and ellipse shape tools
- Text tool for labels and annotations
- Undo and redo support
- Export the canvas to PNG for sharing
- Infinite canvas with pan and zoom
How to use
- Select a tool from the toolbar: pen, arrow, rectangle, ellipse, or text.
- Draw on the canvas by clicking and dragging.
- Adjust stroke color and width as needed.
- Use undo/redo to correct mistakes.
- Export to PNG when finished.
Common use cases
Quick architecture diagrams during code reviews, wireframe sketches for UI discussions, flowcharts for process documentation, and annotated screenshots for bug reports.