What is a CSS Border Radius Generator?
A CSS border radius generator is a visual tool for building the CSS border-radius property using sliders. You adjust each of the four corners independently (or link them together for uniform rounding) and see the result live on a preview element. The tool outputs the exact CSS code ready to use in your stylesheet — no memorization of property syntax required.
How to Use the Border Radius Generator
By default, all four corners are linked — moving one slider changes all corners equally. Uncheck "Link all corners" to control each corner independently. Switch between px (fixed size) and % (proportional to element size). Use the Quick Presets for common designs: Sharp (0 radius), Subtle Card (6px), Standard Card (12px), Pill (fully rounded ends), or Circle (50%). Click "Copy" to copy the CSS.
CSS Border-Radius Syntax
The shorthand property accepts 1–4 values in clockwise order starting from top-left:
- 1 value:
border-radius: 12px— all 4 corners equal - 2 values:
border-radius: 10px 20px— top-left+bottom-right, top-right+bottom-left - 4 values:
border-radius: TL TR BR BL— each corner individually - Pill:
border-radius: 9999px— fully rounded ends on any rectangle - Circle:
border-radius: 50%— circle on square elements
Benefits of Using a Visual Border Radius Generator
- See corner rounding in real time without editing code
- Experiment with asymmetric rounding for unique design effects
- Quick presets for the most common UI patterns (cards, pills, circles)
- Generates optimal CSS — uses shorthand when all corners match
- Works with both pixel and percentage values
Frequently Asked Questions
What is CSS border-radius?
It rounds element corners. Set all 4 at once: border-radius: 12px. Set individually: border-radius: 10px 20px 15px 5px (top-left, top-right, bottom-right, bottom-left clockwise).
How do I make a perfect circle in CSS?
border-radius: 50% on an element with equal width and height. Example: width: 100px; height: 100px; border-radius: 50%.
What is the difference between px and % for border-radius?
px = fixed radius regardless of element size. % = scales with element size. Use % for responsive/proportional rounding, px for consistent fixed rounding.
What is the CSS border-radius shorthand?
1 value = all equal. 2 values = diagonal pairs. 3 values = TL, TR+BL, BR. 4 values = TL TR BR BL clockwise.
Can I create an elliptical border radius?
Yes. Use the / separator: border-radius: 50% / 30% — horizontal/vertical radii independently. Enables complex organic shapes.
What is the 'pill' shape border radius?
border-radius: 9999px — any value larger than half the element's height creates fully rounded ends (pill shape). Standard for buttons and tags in modern UI.
Does border-radius affect the element's clickable area or layout?
No. Border-radius only clips the visual corners. The clickable area and layout box remain rectangular. Use clip-path for truly non-rectangular click targets.
What are the individual border-radius properties?
border-top-left-radius, border-top-right-radius, border-bottom-right-radius, border-bottom-left-radius. Each can have two values for elliptical corners: border-top-left-radius: 20px 10px.