My problem is similar to this question, but I'm using Ilustrator 26.0

I have 2 closed shapes that share a bondary.

This was achieved after "dividing" several overlapping shapes and doing some editing, I end up with shapes that share a bondary but the bondaries curves are not identical.

Is there a ease way of making those bondaries exactly the same but keeping the 2 closed separated shapes?

here is a print: enter image description here

and here is the bondary at 1600% zoom: enter image description here

  • delete the shorter segments edges. use shapebuilder click on both areas. Anyway due to mis-implemented rendering engines you may in fact want to avoid doing this.
    – joojaa
    Jul 10 at 18:54
  • As Joojaa eludes.. it's actually better to have shapes overlap in may instances.
    – Scott
    Jul 10 at 19:32
  • I'm sorry, could you (both) elaborate? Jul 10 at 19:50
  • 1
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    In any event, if you want perfectly aligned sides like that, make one path overlap the other, then select both and use Shape Builder to remove the overlap portions. What's left will align as close as it can be aligned.
    – Scott
    Jul 10 at 20:18

1 Answer 1


The easiest method is to overlap the shapes.

Then utilizing the Shape Builder Tool remove the overlap (by uniting it with one side). The result will be two shapes which are aligned as close as they can be aligned.

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