I have various polygons within one layer in QGIS.
As a result I need the area where all polygons overlap as shown in the picture. Is there a way to do?
Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. It only takes a minute to sign up.
Sign up to join this communityIn the processing Toolbox, under SAGA, you have a treatement called polygon self-intersection which seems to be what you're seeking ...
(as a result, i seem to recall you will have a new field aggregating the id of all the polygons intersecting)
If you need only the geometry and not the attributes, just running normal Vector→ Geoprocessing Tools → Union with no Overlay layer [optional] should do the trick.