Border Radius Generator lets you set the four corners separately and gives you the shortest valid border-radius shorthand, collapsing equal corners automatically.
It supports the elliptical slash syntax for oval corners and shows a live preview. It runs in your browser.
CSS lets you write one value when all corners match, or two for diagonal pairs. The tool always gives the shortest form.
border-radius can take horizontal radii, then a slash, then vertical radii, which makes each corner an ellipse rather than a quarter circle.
Yes. Type a value with a percent sign and it is passed through as-is.
No. The tool runs entirely on this page.