: How to change thickness of outline shapes? How can I change thickness of "outlines", which actually are not strokes but closed shapes? In the following example you can see outlines which I would

@Margaret771

Select the path, then choose the menu option Object > Path > Offset Path...
Make sure the Preview checkbox is checked.
Adjust the value (in pixels) in the Offset field until your path reaches the desired thickness.

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@LarsenBagley460

The easy way: add a stroke of the same colour, then object > path > outline stroke, then merge using Unite in the pathfinder window.

(or even easier: just add a stroke and leave it there so you can adjust it as needed!)

If you need to do the opposite and make it thinner by an even amount: add a stroke, outline stroke as above, then punch the stroke out of the original using Minus front in the pathfinder window.

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