Border Radius Generator

How to Use the Free Client-Side Border Radius Generator

Rounding corners is a deceptively fiddly CSS property once you want different values on each corner. This generator makes those values visual instead of abstract:

1. Choose a preset shape (square, rounded, pill, circle) or adjust each corner individually.
2. Use the sliders to modify top-left, top-right, bottom-right, and bottom-left radii independently.
3. Once satisfied, click the copy button to grab the border-radius CSS property for your project.

When to Use Border Radius Generator

Corner radius is one of the strongest visual signals of a modern interface, and it appears everywhere: cards, buttons, modals, badges, avatars, and input fields. Designers prototyping UI components, developers translating designs into CSS, and marketers building custom landing-page shapes will all reach for this tool when they need a radius that is correct rather than approximate.

The independent corner controls are what separate this from a generic CSS cheat sheet. Setting each corner separately opens up irregular shapes with real personality, like a subtle diagonal rounding effect, while the presets cover the everyday cases instantly. The live preview on a sample element means you see the effect as you drag rather than after a round trip to the browser. The details matter here too: pixel values give fixed radii, percentages relate to element dimensions, and a large value like 9999px turns any rectangle into a pill.

Border Radius Generator Tips and Best Practices

1. Use percentage or em values for corners when elements must scale across screen sizes, so the rounding stays proportional.
2. Create pills by setting border-radius to 9999px or 50% on a rectangular element, ideal for tags, badges, and buttons.
3. Remember that 50% on a non-square element produces an ellipse, not a circle. Use 50% only on equal-width-and-height elements, or a large fixed px value elsewhere.
4. Pair border-radius with overflow hidden on the parent so nested backgrounds and images are clipped to the same rounded shape.

Why Client-Side Privacy Matters for prototyping interface components for pre-launch products

Prototypes for unreleased products often contain proprietary layout decisions and unannounced visual directions. Exporting CSS values through an online generator that logs your interactions can leave a trail of what you are building before it exists publicly.

This generator computes everything in your browser. The radius values you choose and the CSS they produce never travel over a network, so component experiments and pre-launch interfaces stay entirely on your machine.