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pavlonjablon
Participating Frequently
September 26, 2026
Answered

How to find the centerline/skeleton of an outlined letter?

I’m attaching a few references. I know these examples are very geometric and were most likely constructed from scratch, but I’m trying to get a similar result from existing outlined letterforms.

What I need is the actual middle line / skeleton / medial axis of each stroke, including rounded sections, so I can use that as the basis for consistent chiseled/beveled facets.

For straight parts I can approximate it by blending between opposite edges, but curved sections are the problem, especially when the inner and outer curves have different anchor placement.

Is there any reliable Illustrator method, script, or plugin that can extract this centerline from an outlined shape? Thanks!

 

    CORCTON34033231
    CORCTON34033231Correct answer
    Community Expert
    September 26, 2026

    Hi! Short answer: Illustrator doesn't have a built-in tool to extract a centerline (medial axis) from outlined paths — there's no native equivalent of a "centerline trace" feature. The closest native method is the Blend technique you're already using: select the two opposite edges of a stroke, then Object > Blend > Make with Blend Options set to Specified Steps: 1. The mid-path is the exact centerline for straight, parallel-edged sections and a good approximation for simple curves; then Object > Blend > Expand to turn it into a regular editable path. For complex or variable-width curves it gets fiddly — which is why those geometric monoline letters in your references are normally drawn as strokes from the start rather than derived from outlines.

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    4 replies

    RvdT
    RvdT
    Legend
    September 28, 2026

     

    Blend options tool (1 step).
    Convert text to outline. Make 2 paths. Ungroup, Release compound path, Blend. Make sure the vertices are the same amount and opposite to each other. You can add points while the blend is active to see the result change.
    Note: Does not work with all numbers or letters.
    In other cases manual drawing might be easier. A negative offset path might help.
    Good luck

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      Monika Gause
      Community Expert
      Monika GauseCommunity Expert
      Community Expert
      September 26, 2026

      You can try the 3D effect with a bevel. Then render as vector and expand. But with these geometric shapes I would not even use a blend. I would probably use align to get it really to the center.

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      CORCTON34033231
      Community Expert
      CORCTON34033231Community ExpertCorrect answer
      Community Expert
      September 26, 2026

      Hi! Short answer: Illustrator doesn't have a built-in tool to extract a centerline (medial axis) from outlined paths — there's no native equivalent of a "centerline trace" feature. The closest native method is the Blend technique you're already using: select the two opposite edges of a stroke, then Object > Blend > Make with Blend Options set to Specified Steps: 1. The mid-path is the exact centerline for straight, parallel-edged sections and a good approximation for simple curves; then Object > Blend > Expand to turn it into a regular editable path. For complex or variable-width curves it gets fiddly — which is why those geometric monoline letters in your references are normally drawn as strokes from the start rather than derived from outlines.

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        Community Expert
        Bobby HendersonCommunity Expert
        Community Expert
        September 27, 2026

        I use a method kind of like this to create centerlines of letter strokes for making inline or bevel effects. Letter paths usually have to be broken into shorter segments. A single step blend can be created between the two parallel path segments. Very often one of the two paths will need its path direction reversed to make the blend path behave correctly.

        Obviously it’s easier to create these effects with sans serif typefaces, particularly ones with monotone strokes (such as Gotham).

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