Boolean Assistant

Pick a boolean operation (Union, Subtract, Intersection, Weld, Exclude) with a live preview before committing.

The Boolean Assistant dialog gives you a live preview of each boolean operation on the current selection so you can see the result before applying.

For one-click ops without preview, use the buttons on the Modifiers Toolbar.

When it opens

Menu: Vector → Boolean (or hotkey Ctrl+B), with 2+ shapes selected. Weld works on 1 or more; the other operations require exactly 2.

Top: 5-button operation selector, Union, Subtract, Intersection, Weld, Exclude.
Center: a live SVG preview. Source paths are shown with dashed outlines; the result is filled cyan.
Footer: Cancel / Apply.

The active object count is shown in the header.

Operation	Effect
Union	Combine both shapes into one. Overlap merges.
Subtract	Remove the second shape from the first.
Intersection	Keep only the overlapping region.
Weld	Like Union but works on any number of selected shapes.
Exclude	Keep non-overlapping regions; remove the overlap.

Non-Weld operations require exactly 2 shapes. With 3+ selected, only Weld is enabled.
The preview updates as you click between operation buttons (debounced).
If the operation produces no resulting geometry (e.g. fully-disjoint shapes intersected), the preview shows No resulting geometry.
Errors in the underlying boolean engine are surfaced in the preview area.

Modifiers Toolbar
Hotkeys: direct boolean shortcuts (Alt++, Alt+-, Alt+*)
Shape Properties panel: inline Union/Subtract/Intersection when exactly 2 are selected