CSS Border Radius Generator

• Paint Operations: Rounded corners trigger paint operations. Avoid animating border-radius on large elements or many elements simultaneously.
• Layout Stability: Percentage-based border-radius scales with element size, maintaining aspect ratio for responsive designs.
• GPU Acceleration: Animated border-radius properties may benefit from will-change: border-radius for smoother animations.

• Maintain sufficient contrast between rounded elements and their backgrounds.
• Avoid extreme rounding on interactive elements that may affect touch target size.
• Ensure focus indicators remain visible on rounded buttons and inputs.
• Test keyboard navigation with custom-shaped interactive elements.

Generated code is production-ready. For component-based frameworks:

// React Component Example
const RoundedCard = ({ radius = '8px', children }) => (
  <div style={{ borderRadius: radius }}>
    {children}
  </div>
);

For CSS-in-JS solutions, use the values directly:

// styled-components
const StyledButton = styled.button`
  border-radius: ${props => props.radius || '4px'};
`;

1. Overusing extreme values: Values above 50% on non-square elements create unpredictable shapes.
2. Ignoring overflow: Content inside rounded containers may need overflow: hidden.
3. Forgetting transitions: Add transition: border-radius 0.3s ease for smooth hover effects.
4. Responsive oversight: Use relative units (%, em, rem) for responsive designs instead of fixed pixels.
5. Browser differences: Test elliptical values across browsers as rendering can vary slightly.

Supported:

• All standard border-radius syntax variations
• Elliptical corners with X/Y axis control
• Multiple CSS units (px, %, em, rem, vh, vw)
• Hover states and CSS animations
• Responsive breakpoint generation

Not Supported:

• Individual border radii for different sides (top/bottom vs left/right)
• CSS custom properties (CSS variables) generation
• Compound shapes using multiple elements
• SVG border-radius properties

Set a square element (equal width and height) to border-radius: 50%. Use the "Circle" preset or set uniform radius to 50% with % units.

Elliptical syntax uses slash notation: border-radius: horizontal / vertical. Ensure you're using the elliptical controls or manual syntax correctly.

Percentages are relative to the element's dimensions. border-radius: 50% creates an ellipse where horizontal radius is 50% of width and vertical radius is 50% of height.

Yes, but be cautious of performance. Use the animation controls in this tool or implement with CSS transitions for hover effects.

This generator complements other CSS tools for complete styling workflows. Combine with:

• Box-shadow generators for depth on rounded elements
• Gradient generators for background styling
• Flexbox/Grid tools for rounded component layouts
• Transition generators for smooth radius animations