I am new to Sketch and have been using Illustrator before.

Now I made a cog in sketch, however I don't want it to have hard edges, but rather rounded ones. Here is how I made my cog in Sketch:

enter image description here

Now when I select the shape, I can round corners, however it will only round the corners of the rectangles:

rounded corners outcome in sketch

When I flatten the shape rounding corners for the "inner edges" (don't know what to call them) is greyed out:

enter image description here

In Illustrator however this is only a matter of a few clicks:

Illustrator Procedure

Here a better look at the desired outcome:

enter image description here

There surely is a way to do that in sketch, I figure. I'd be very thankful if someone could teach me how :)

  • As far as I am aware, in Sketch it is not possible to round corners on path segments that aren’t straight lines. In your example, the segments you’re trying to round are bézier curves. (Yep, Illustrator can do it.) Mar 22, 2017 at 22:56
  • 2
    If you have access to Illustrator, it’s probably best to just create the icon in it, and then copy it back into Sketch. Mar 23, 2017 at 1:55

2 Answers 2


I'm not a Sketch user, however if it's not possible to round the corners automatically, then it would be possible to do it manually.

  • Create one tooth of a cog wheel, by drawing a rounded rectangle over a circle, uniting, and manually editing the curve by adding an extra anchor/node
  • One half of the circle should suffice, as you can delete the other half, reflect the part with the rounded tooth, and do a boolean operation to unite it

  • Then duplicate and rotate the tooth around a circle

  • Then do a boolean operation to unite all the pieces

Here's a quick animated proof of concept (done in Inkscape), but I'm pretty sure it could be done in any vector image editor, with basic operations.

enter image description here


The closest I have come in Sketch is by adding extra vector point (correct name?) on the bézier curves and then converting the the corners to the "straight" type.

Cogwheel shape.

Adding extra vector points on the bézier curves.

Converting to straight path segments and rounding the corners.

This is somewhat of a hack and I look forward to hear if there is some better approach!

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