How to Change the Corner Radius in Illustrator CS5

Written by scarlett gauthier
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Adobe Illustrator CS5 allows you to create vector artwork that you can scale indefinitely, and the artwork does not rely on pixels. Illustrator has many options for creating vector artwork, such as rounded rectangles. The rounded corners are an efficient way to deviate from the square corners commonly seen in designs and artwork. You can change the corner radius in Illustrator CS5, as well as the rounded corners when drawing a rectangle, to help determine the roundness of the corners of your objects.

Skill level:
Moderately Easy


    Default Corner Radius

  1. 1

    Open Illustrator by double-clicking on its icon. Open a new Illustrator document by selecting "New" from the "File" menu.

  2. 2

    Navigate to the "Edit" menu, and then select "Preferences" from the list. Click on "General" from the drop-down list.

  3. 3

    Enter a new value for the corner radius in inches. Click "OK" to apply the changes. These changes now apply to any future Illustrator CS5 document.

    Round Corners on Objects

  1. 1

    Select the "Rounded Rectangle Tool" from the "Tools" palette in Illustrator.

  2. 2

    Draw a rounded-corner rectangle or square by clicking in the desired spot on the Illustrator artboard and dragging with your mouse.

  3. 3

    Increase the round corner effect with the "Up" arrow key on your keyboard while dragging with your mouse to create the rectangle or square. Decrease the effect with the "Down" arrow key. Release the keys when you have achieved the desired roundness.

Tips and warnings

  • You cannot change the roundness of a round-corner rectangle or square after the object is created.

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