: Create some Stroke from expanded shape I created some shape using 6 pixels stroke (no fill), then I expanded it and get the desired shape. Later, I need the same shape with thinner lines,

@Hamaas979

There is no method to recover the exact spline from an expanded path. Here's a link to Mike Kamermans' excellent Primer on Bézier Curves that explains the math with interactive examples.

The gist: You cannot compute the exact offset of Bézier Curves - Illustrator has to "guess" the best answer it can. If you're trying to recover a path from its offset, you'll be "guessing" twice.

The most accurate path you can generate will come from using a negative offset, as per JohnB's answer. Just be sure to use slightly less than half of the original stroke width (6pt stroke -> -2.9pt offset) to account for the errors introduced. Finish by using the Cut Tool to isolate one side of your offset path.

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@Michele215

You could try this:

Your expanded stroke should be a compound path. So..

1. Release the Compound Path

Using Object → Compound Path → Release. This will hopefully leave you with two shapes:



2. Offset One of the Shapes

Each shape should be 3px either too small or too large. You can delete one of them (I deleted the smaller shape) and use Object → Path → Offset Path... to "shrink" it. If you use the larger shape, enter -3px.

This will create a "shrunken" shape for you that is hopefully what you need:



There are probably some cases where this will not work, I'd guess that it depends on how complex your expanded stroke is.

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