Border Radius Generator

The Border Radius Generator is a powerful, professional, and easy-to-use online tool designed to help developers, designers, and UI/UX creators generate perfect CSS border-radius values in seconds. Whether you want smooth rounded corners, creative blob shapes, or fully custom elliptical radii, this tool lets you visually design every corner with precision. No more guessing values or refreshing browsers repeatedly — simply adjust sliders, preview instantly, and copy clean, production-ready CSS with one click. Built with a modern, responsive UI and advanced customization options, it supports px, %, and em units, along with four-corner independent control, preset shapes, live previews, and export features. The generator is ideal for beginners learning CSS, as well as professionals crafting complex UI elements. Fast, accurate, and mobile-friendly, it saves time and enhances workflow, making it an essential part of every front-end toolkit. Explore unlimited border-radius possibilities effortlessly.

Create CSS border-radius visually — px, %, elliptical, presets.

Controls

Adjust corners (top-left, top-right, bottom-right, bottom-left). Use px, %, or em. Toggle elliptical values when needed.

Top-left
tl
Top-right
tr
Bottom-right
br
Bottom-left
bl
Resize: drag handle

Live preview

Box size:
300px

Generated CSS

Shorthand & expanded
Use border-radius to round corners — choose px or % for different effects.

Presets & Favorites

Saved shapes

Quick Tips

  • Use % for circles that scale with size.
  • Use elliptical mode for complex organic shapes.
  • Save favorites to reuse shapes across projects.

FAQ

The border-radius CSS property rounds the corners of an element's outer border edge. You can specify one to four radii, and use / to set elliptical radii.

Use percentages for responsive circles (50% often creates perfect circles). Use px/em for exact fixed radii unaffected by element size.

Use syntax like border-radius: 30px 10px / 20px 40px; where left side are horizontal radii and right side are vertical radii for each corner.

Yes — you can copy CSS, download a .css file or export/import presets as JSON for sharing.

Controls include labels and keyboard focus. There's a dark/high-contrast theme, and ARIA attributes where helpful.

Click a preset to apply it. Use Save to add favorites into localStorage for future sessions. Export JSON to back them up.

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