PaperCAD

Rules: keep positions; expand each circuit trace outward from its center until it meets another trace (keeping a 2 mm gap) or the canvas edge.

Pins: drop pairs of micro‑squares (0.7 mm size, 2.54 mm center spacing; switch Horizontal/Vertical). Traces snap to pin corners; pin ↔ pin snapping aligns centers.

Canvas: 10×10 cm · 300 PPI · no outer margin. Preview exports with transparent background; the 2 mm gaps are transparent.

Draw / edit circuit traces: drag to create; click to select then move/resize; Delete to remove; Arrow keys to nudge (Shift×10).

Pin mode: click to drop a paired micro‑square; drag to move; Delete removes. Circuit traces snap to pin corners.

Preview (transparent background; 2 mm gaps are transparent).