Union — Tool (QGIS)

In QGIS: Processing Toolbox › Vector overlay › Union (native:union); menu: Vector › Geoprocessing Tools › Union.

Realises:

• Union

Settings that matter

• Leave Overlay layer empty to split a single layer where its own features overlap.

Watch out

• Union splits areas where layers overlap. To put layers together without splitting them, use Merge vector layers (Tool - QGIS).

Checked in QGIS 4.2.2, October 2026. Names and options can differ in other versions.