Border Radius CSS Generator

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Craft Perfect Border Radius Values Visually

CSS border-radius is deceptively simple - until you want asymmetric corners, pill shapes, or organic blob forms. The Border Radius CSS Generator gives you a visual editor where you drag corners independently and see the result in real time, then copy the exact CSS. No more guessing values, refreshing the browser, and adjusting by trial and error.

Beyond Simple Rounded Corners

Most developers know border-radius: 10px rounds all four corners equally. Fewer know that each corner accepts two values - a horizontal and vertical radius - creating elliptical curves instead of circular ones. That's eight individual values in total, and the combinations produce shapes ranging from subtle asymmetric cards to organic blobs that look nothing like a rectangle.

The border radius CSS generator exposes all eight values through an intuitive visual interface. Drag control points on a preview shape and watch the CSS update in real time. The shorthand and longhand notation are both displayed, so you can copy whichever your project's code style prefers.

Common Patterns Made Easy

Pill buttons: Set border-radius to a value larger than half the element's height (e.g., 9999px) and you get perfectly rounded ends regardless of the button's width. The generator shows this instantly when you max out the slider.

Asymmetric cards: Round only the top corners for card headers that sit inside a rectangular container. Or round one diagonal pair for a playful, modern look. The visual editor makes it obvious which corners are affected as you adjust.

Organic shapes: By setting different horizontal and vertical radii on each corner, you can create blob-like shapes popular in contemporary web design. These organic forms are nearly impossible to code by hand - you need visual feedback to get them right, which is exactly what this border radius CSS generator provides.

Chat bubbles: The classic speech-bubble shape uses three rounded corners and one sharp corner. Tack on a CSS pseudo-element for the tail, and the border-radius generator handles the body shape perfectly.

Who Uses This Tool?

Frontend developers building component libraries use it to establish consistent border-radius tokens across a design system. Rather than picking arbitrary values, they visually adjust until the curve feels right, then extract the exact pixel or percentage values for their design tokens file.

UI/UX designers who hand off specifications to developers use the generator to produce precise CSS that matches their design tool's output. Figma, Sketch, and XD all handle corner radius slightly differently from CSS, especially for asymmetric corners. The visual editor bridges that gap - adjust until it matches the mockup, copy the CSS, done.

CSS beginners learning about the border-radius property use it as an educational tool. Seeing the visual result change as values adjust builds intuition about how the property works far faster than reading documentation alone. The split between circular and elliptical radius modes is particularly illuminating - most tutorials skip the elliptical syntax entirely.

Advanced Features

The generator supports both pixel and percentage units. Percentage-based border-radius creates shapes that scale with the element - a 50% border-radius on a square creates a perfect circle, while the same value on a rectangle creates an ellipse. Switching between units in the generator shows this behavior immediately.

You can also toggle between the shorthand syntax (one line) and the longhand per-corner syntax (four separate properties). Some codebases prefer the explicitness of longhand notation, especially when only specific corners are rounded while others remain sharp.

Practical Tips

Use consistent radius scales. Pick a set of values (4px, 8px, 12px, 16px, 24px) and stick to them across your project. The Border Radius CSS Generator helps you visualize each step in the scale so you can choose values that create meaningful visual distinction between elements.

Test at multiple sizes. A border-radius that looks perfect on a 300px card might look too subtle on a 100px thumbnail or too aggressive on a 600px hero section. Design your radius values relative to the element's size, not in isolation.

Remember overflow: hidden. Border-radius alone doesn't clip child content. If an image or background color inside a rounded container extends beyond the curves, add overflow: hidden to the container to enforce the rounded clip path.

The Border Radius CSS Generator runs entirely in your browser - adjust, copy, and paste into your project without any server processing or account requirements.