How to use the Border Radius Previewer
- Enter your details in the fields above.
- See your results instantly - free, no signup.
- Copy, share or bookmark the result.
What Is the Border Radius Previewer?
The Border Radius Previewer lets you visually adjust CSS border-radius values for each corner independently and see the result in real-time. It generates the exact CSS code for your chosen shape.
Perfect for creating custom button shapes, card designs, or organic-looking UI elements.
How It Works
Adjust sliders for each corner's border radius or use the shorthand slider for uniform rounding. The preview updates instantly, and the generated CSS is ready to copy.
Supports both pixel and percentage units for maximum flexibility.
Useful for
- Designing custom button and card shapes
- Creating pill-shaped or organic UI elements
- Experimenting with asymmetric corner rounding
- Generating CSS border-radius values visually
Who should use it
- Frontend developers styling components
- UI designers who code
- Anyone who prefers visual tools over writing CSS values manually
Common mistakes to avoid
- Using different border-radius values inconsistently across a UI
- Not testing rounded corners on different element sizes
- Over-rounding elements making them look dated
When not to use it
- When your design system has fixed border-radius tokens
- For simple uniform rounding where you know the value
Frequently asked questions
What's the difference between px and % for border-radius?
Pixel values give absolute rounding regardless of element size. Percentage values scale with the element - 50% on a square creates a perfect circle. Use % for responsive designs.
Related Design Tools
- Color Palette Generator - Generate harmonious color palettes for your next project
- Contrast Checker - Make sure your text is readable against its background (WCAG)
- Font Pairing Helper - Discover font combos that look great together
- Gradient Generator - Build beautiful CSS gradients and grab the code instantly
- Image Size Cheat Sheet - Quick-reference guide for social media and web image dimensions
- Lorem Ipsum Generator - Generate placeholder text for your designs and layouts
- Box Shadow Generator - Create custom CSS box shadows with a live preview
- Spacing & Scale Calculator - Calculate consistent spacing scales for your design system