CSS Border Radius Generator
Generate complex CSS border-radius shapes visually.
CSS Output
Generate complex CSS border-radius shapes visually.
This free CSS Border Radius Generator from KX Toolkit is part of our all-in-one online toolkit. It runs entirely in your browser, so your data never leaves your device for client-side operations. 100% free, forever - no paywall, no credit card, no trial.
How to use the CSS Border Radius Generator
- Adjust the visual controls in the tool.
- See the live preview update instantly.
- Read the generated CSS code below the preview.
- Copy the code and paste it into your stylesheet.
What you can do with the CSS Border Radius Generator
- Skip writing CSS by hand for gradients and shadows.
- Prototype layouts with flexbox/grid generators.
- Generate hover/focus animations without keyframes by hand.
- Build component styles faster.
Why use KX Toolkit's CSS Border Radius Generator
- Browser-based: Works on Windows, macOS, Linux, iOS and Android - no install, no extension.
- Privacy-first: Client-side tools never upload your data; server-side tools delete files right after processing.
- Mobile-friendly: Full feature parity on phones and tablets - not a stripped-down view.
- Fast: Optimised for instant feedback. No artificial waiting screens, no email-gated downloads.
- One hub for everything: 300+ tools across SEO, text, image, PDF, code, color, calculators and more - skip switching between sites.
Tips for the best results
Generators are a starting point - always tweak the final values for your design system rather than shipping defaults.
Related CSS Tools
If you find this tool useful, explore the full CSS Tools collection or browse our complete tool directory. KX Toolkit is built for marketers, developers, designers, students and anyone who needs a quick utility without signing up for yet another SaaS.
How does the four-value vs eight-value syntax work?
`border-radius: 10px;` rounds all four corners equally. With four values, they apply clockwise from top-left: `top-left top-right bottom-right bottom-left`. The slash syntax (`border-radius: 50px 20px / 30px 40px;`) sets horizontal radii before the slash and vertical radii after, letting you create elliptical corners with different x and y curvatures for organic blob-like shapes.
How do I make a perfect circle or pill shape?
For a circle, set `border-radius: 50%` on a square element. For a pill or capsule shape, use `border-radius: 9999px;` (or any large fixed value) on a rectangular element; it caps the radius at half the shorter side, producing fully rounded ends regardless of width. Both patterns are responsive and don't need recalculation when the element resizes.
Why do my rounded corners look pinched on the inside?
When a parent has rounded corners and a child sits flush against them, the child's sharp corner pokes through. Either give the child the same outer radius, or use the `border-radius` math: child radius equals parent radius minus the gap between them. Modern CSS includes the experimental `corner-shape` and `inner` keywords to handle this automatically, but manual matching still works everywhere today.
Does `border-radius` clip child content?
Not by itself. The element's border and background are clipped to the rounded shape, but children that overflow the rounded area still render past the corners. To clip children, add `overflow: hidden;` on the rounded element. Be aware this also disables tooltips and dropdowns escaping the bounds, and creates a new stacking context that can affect z-index behavior.
Can I create asymmetric organic shapes?
Yes, by combining the slash syntax with very different values per corner. For example, `border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;` produces a soft, blob-like silhouette popular in modern hero illustrations. The generator's visual editor lets you drag control points to discover unique shapes, then exports the exact CSS for you to drop into your stylesheet.
How do percentage radii differ from pixel radii?
Pixel radii stay constant regardless of element size, so a 12px radius looks tighter on a 400px card than on a 100px button. Percentage radii scale with the element's dimensions, with horizontal percentages relative to width and vertical relative to height. Use pixels for consistent UI rounding across components; use percentages for shapes that need to maintain their proportional curvature as the element resizes.
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