Drawing Board

A canvas-based sketching tool with pen, eraser, line, rectangle, circle, and arrow tools. It supports undo/redo history, an adjustable color and line width, fullscreen mode, PNG download, and persistent saved drawings stored locally in IndexedDB. Shapes (line/rectangle/circle/arrow) are drawn by click-dragging a live preview; the pen and eraser stroke continuously.

1. Pick a tool button (pen, eraser, line, rectangle, circle, arrow). 2. Choose a color and line width (1-50). 3. Draw on the canvas. Use Undo/Redo (or Ctrl+Z / Ctrl+Shift+Z), Clear to wipe, Save to store, Download to export PNG, or the expand icon for fullscreen. 4. Saved drawings appear below — click Load to restore or the trash icon to delete.

The canvas auto-scales with devicePixelRatio and fills a white background. Eraser strokes paint white at 3x line width. Saved drawings are stored under the key drawing-board-saved in IndexedDB; if IndexedDB is unavailable, saves silently fail without an error message. Fullscreen resizes the canvas and preserves the current artwork.