OneTool

CSS Border Radius Generator

Shape corners per-side or link them, then copy border-radius CSS.

Preview

What is this tool?

Border radius softens rectangular boxes. This generator lets you set each corner independently or link all four, previews the shape live, and emits compact CSS.

How to use it

  1. Drag corner sliders (or link all corners).
  2. Preview the shape in the teal box.
  3. Copy the border-radius declaration.