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Nested Box Diagram Tool

A lightweight, in-browser tool for sketching nested box diagrams — handy for wireframes, system architecture sketches, org charts, or any quick visual you'd otherwise reach for a whiteboard for. Draw boxes, nest them inside one another, label them, and resize freely. Nothing is saved or sent anywhere; it all lives in this browser tab.

Draw: click & drag on empty space (or inside a box to nest it)  •  Move: drag a box by its label  •  Edit text: click a label, type, press Enter  •  Resize: drag the handle in a box's bottom-right corner