Free Developer Tool - runs 100% in your browser
Whiteboard
Tip: keyboard shortcuts - P pen, L line, A arrow, R rectangle, O ellipse, T text, E eraser, Ctrl+Z undo. The board autosaves to this browser.
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A free online whiteboard in your browser
This online whiteboard is a lightweight, tldraw-style drawing board built with plain JavaScript and the HTML5 canvas - no installs, no account, no upload. Sketch freehand with the pen, drop inrectangles, ellipses, lines and arrows for quick diagrams, add text labels, erase mistakes, undo and redo without limits, and export the result as a PNG image when you're done.
Whiteboard or blackboard - your choice
Toggle between a classic white board and a black board with one click - handy for dark-mode screenshots, teaching-style chalk diagrams, or simply matching the rest of your slides. Drawings are preserved when you switch, and the PNG export uses whichever background is active.
What people use it for
- System diagrams - boxes, arrows and labels are all you need for an architecture sketch.
- Brainstorming - dump ideas visually during a call, then export and share the PNG.
- Teaching and explaining - draw while screen-sharing instead of waving the cursor around.
- Quick annotation drafts - plan markup before annotating a real screenshot.
Private and persistent
Everything you draw stays in your browser - the board autosaves to local storage, so an accidental tab close won't destroy your sketch, and nothing is ever sent to a server. Need to share it? Export the PNG. Need a text-first scratchpad instead? Try the online notepad.