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I always ended up just creating a new rounded rectangle if the existing one don't work. Is there a way to modify the corner radius without having to create a new shape?

I know I can modify the bezier handle manually one-by-one, but I can't figure out how to do this in a more accurate way for all 4 corners.

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4 Answers 4

up vote 27 down vote accepted

It seems like the best way is to use the Stylize/Round Corners effect on a regular rectangle. This way the corner radius is changeable and independent of the rectangle transform property.

With this method, the Appearance panel will have a Round Corners setting for any round rectangle paths. This will allow you to edit the corner radius for existing shapes.

Appearance Panel with Round Corners

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While drawing rounded rectangle (while still holding your mouse button), press UP and DOWN arrows to change radius.

It is common way of changing attribute values of certain tools in AI.

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While true, this doesn't answer the question of editing after the rectangle has been drawn. –  Scott Sep 22 '12 at 19:38

Seems you've already figured out that the Stylize Effect is a better method. If you want to go one step further check out VectorScribe from http://www.astutegraphics.com it's a fabulous plug in that will allow you to not only continually round any corner but also had many other very useful features.

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Try using Convert to Shape effect: Effect > Convert to Shape > Rounded Rectangle...

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protected by Matt Nov 11 '13 at 15:57

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