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I'm doing some polygon (boundary) cleanup, and am wondering if it is possible to add a node/vertex to a set of selected polygons or even a single polygon.

By the way, the QGIS topology editing tools are incredible - extremely simple but very accurate and take so much of the work away from doing such manual work.

QGIS gives the ability to remove selected nodes - amazing that the topology is preserved and even improved when cleaning up excess nodes. Great stuff!

  • zoom to that line you will see a cross click on that and vertex wil be added – Shahrukh Shaikh Nov 21 '19 at 12:27
  • Yes did it and gave me right. In fact am using qgis 2.18.27 version. Thanks for upgrading me – Mustapha Alkali Mar 2 at 9:39
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With the Node tool (called the Vertex Editor in QGIS 3.0+) selected, simply double-click on a line segment you want to add a node to enter image description here

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To add to that, to delete a vertex, you will just need to select the point and hit the delete key on the keyboard.

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If you're having trouble getting the little cross to pop up on the segment you want to add the node to, check your snapping tolerances. Mine were too high, making it impossible to get it on shorter segments. Go to settings > options > digitizing > snapping > "search radius for vertex edits" and set it to something like 10 pixels. Mine was set to 100 map units because I am silly.

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