The generator outputs one border-radius declaration in top-left, top-right, bottom-right, bottom-left order. You can keep all corners linked or unlock them, then choose px or percent units before copying the CSS.
Background and box colors are only there to make the radius visible while you tune the shape. The copied code contains only the border-radius property, so you can paste it into an existing button, card, or component style without extra color rules.
Common questions and answers about this topic.
Yes, customize each corner independently — top-left, top-right, bottom-right, and bottom-left — or set all corners at once using the 'All Corners' control.
Both pixels (px) and percentages (%) are supported. Use percentages to create responsive shapes like circles (50%) or pill shapes.
Yes, set all corners to 50% for a perfect circle on a square element, or use large pixel values for a pill/capsule shape on rectangular elements.
No, border-radius CSS generation is handled entirely in your browser. Your radius values are processed locally — no data is uploaded.