Drag a square corner pin to stretch just that corner's two edges — the rest of the mesh only follows where it's actually connected, so untouched corners and edges hold still.
Drag any edge or inner pin to place it directly. Double-click a pin to snap it back to its default position. Hold Shift while dragging for slow, precise placement. Ctrl/Cmd+Z to undo.
2 — Live preview (low-res, updates as you drag)
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Show mesh guide
Hover the preview for a crosshair guide to check squareness. Pin numbers match the source photo. Neither the guide nor the crosshair are ever part of the export.