I need to digitize a lot of polygons and I want to ease my work with the 'avoid intersection' button so that the new polygons do not overlap. In the manual I found (for version 2.6) that the button is hidden in 'snap options', but I can't find it.

How do I activate 'avoid intersection'?

2 Answers 2


In the Snapping options dialog, change the Snapping mode option to "Advanced". My Osgeo4W version of QGIS has a slight bug where if "Advanced" is already selected, you must change it to any other option and then switch it back.

  • That's it, thanks! Furthermore my window was too small so I couldn't see the box to turn the 'avoid intersection' on, I had to scroll to the right. Finally I found it =)
    – Martin
    Commented Aug 4, 2015 at 12:14

I guess you just need to turn Snapping mode to Advanced with the dropdown box.

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