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Sketch Diagrams

Freehand drawing board with shapes, arrows, and text. Export as PNG.





About this tool

A freehand canvas whiteboard for quickly sketching diagrams, wireframes, and system designs. Draw rectangles, ellipses, lines, arrows, and freehand paths - add text labels, choose from 10 colours, and adjust stroke weight. Includes undo/redo history and PNG export. Everything runs in your browser with no account or signup required.

How to Sketch a Diagram Online

  1. 1Select a drawing tool from the toolbar (Pen, Rect, Ellipse, Line, Arrow, or Text).
  2. 2Pick a colour from the palette and adjust the stroke size slider.
  3. 3Draw on the canvas. For shapes, click and drag to set the size.
  4. 4Use Undo / Redo to correct mistakes, or the Eraser to remove specific strokes.
  5. 5Click 'Download PNG' to export your finished diagram.

Frequently Asked Questions

What drawing tools are available?+
Pen (freehand), Eraser, Rectangle, Ellipse, Line, Arrow, and Text. Select a tool from the left toolbar, pick a colour and stroke size, then draw on the canvas.
How do I add text to the diagram?+
Select the Text tool, click anywhere on the canvas, type your label, and press Enter or click elsewhere to confirm.
Can I undo mistakes?+
Yes. Use the Undo and Redo buttons in the toolbar, or keyboard shortcuts Ctrl+Z / Ctrl+Y.
How do I export my diagram?+
Click the 'Download PNG' button to save the canvas as a PNG image.
Looking for a deeper guide on this topic? Browse the Searchlight blog.
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