Question 1

What is the difference between Ratio and Uniform mode?

Accepted Answer

Ratio mode calculates corner radius as a percentage of each side's length — at 50% a rectangle becomes an ellipse. Uniform mode uses the shorter side as the base — at 50% the short edges form perfect semicircles, creating a stadium shape.

Question 2

Is the background transparent?

Accepted Answer

Yes, the rounded corners are cut out and saved as a transparent PNG.

Question 3

How do I make a perfect circle?

Accepted Answer

Use Ratio mode at 50% on a square image for a perfect circle. On a rectangular image it will be an ellipse.

Question 4

Why is the slider range 0–50%?

Accepted Answer

Beyond 50% the corners would overlap each other, so 50% is the maximum — the point at which you get a perfect circle or ellipse.

Question 5

Can I create an app icon style (rounded square)?

Accepted Answer

Yes, set Uniform mode to around 15–20% for the rounded-rectangle (squircle) style used by most app icons.

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How to use Corner Rounding

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