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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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up vote 7 down vote accepted

In the new Adobe Illustrator CC, you can use 2 easy methods to change the corner radius of a rounded corner rectangle that has already been drawn:

1. By moving the round handles

Simply hold and drag the round blue handles in each corner.

How to change the corder radius of a rounded rectangle

2. By going in the Shape Options (more precise)

You can change the border radius of all four corners with precision by using the Shape Options and simply enter a new measurement for your corners.

To change only one corner or give a different corner radius value to each of them, click the chain in the middle and fill the corner radius field for each corner.

How to change numerically the corners of a rounded rectangle

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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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But too bad that if you then use that path as a Clipping Mask the rounding effect will break. And if you do the Clipping Mask first, then try to add the Round Corners effect the image disappears. If trying to use this method with a Clipping Mask you can't win. – Mentalist May 17 '15 at 7:55

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 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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If you are a CS6 user you can also select the object with the border radius applied and go to:

effect/convert to shape/rounded rectangle

set to relative, zero out your extra space sections and set the new border radius.

They could have made this easier for users. Doing this a few times over will drive you nuts.

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My bad. Didn't realize this solution was posted already – John Dangerous Feb 16 at 19:42
I would also recommend switching to Sketch. Fewer headaches. – John Dangerous Apr 21 at 17:45

protected by Darth_Vader Nov 11 '13 at 15:57

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