CSS border-radius is a property that allows you to round the corners of HTML elements. You can control each corner individually or set them all at once, creating anything from slightly rounded corners to complete circles.

Simply copy the generated CSS code and paste it into your stylesheet. You can apply it to any HTML element by targeting it with a class, ID, or element selector. The code includes vendor prefixes for better browser compatibility.

Yes! To create a perfect circle, set all four corner values to 50% and ensure the element has equal width and height. Our generator makes this easy by allowing you to set high values that will create circular shapes on square elements.

CSS border-radius is supported by all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. It has excellent browser support with over 98% global coverage according to Can I Use statistics.

Pixel values (px) create fixed-radius corners, while percentage values (%) create elliptical corners relative to the element's dimensions. 50% will always create a perfect ellipse or circle regardless of element size.