Independent corner radius controls.. Border Radius Generator is a free online tool from the ToolsRift Developer Tools collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.
Drag the per-corner sliders to round each corner separately, preview the shape live, and copy the resulting border-radius CSS including elliptical values.
Yes — border-radius accepts up to four values (or eight with a slash) to control each corner's horizontal and vertical radius separately.
Set border-radius to 50% on a square element; equal width and height then render a full circle.
Uneven horizontal and vertical radii per corner, using the slash syntax, produce smooth asymmetric organic blob shapes.