CSS Border Radius Generator

Corner Radii

Top Left

12px

Top Right

12px

Bottom Right

12px

Bottom Left

12px

Presets

Lock corners together

Preview

Preview Box

CSS Code

border-radius: 12px 12px 12px 12px;

it lets users visually set rounded corners for any HTML element and instantly generates the CSS border-radius property code — no manual writing needed.

What Is CSS Border Radius?

Explain the border-radius CSS property: what it does (rounds the corners of an element's outer border edge), the four individual corners (top-left, top-right, bottom-right, bottom-left), and how values can be expressed in px, %, em, or rem. Mention that all four can be set independently for asymmetric designs.

How to Use the CSS Border Radius Generator

A simple step-by-step section:

Drag the sliders to set the radius value for each corner (Top Left, Top Right, Bottom Right, Bottom Left).
Enable Lock Corners Together to apply a uniform radius to all four corners at once.
Use the preset buttons for instant common shapes: sharp square, rounded rectangle, full circle/pill, or diagonal curve.
Watch the live preview box update in real time.
Copy the generated CSS code with one click.

Border Radius Presets Explained

Cover the four built-in presets and their use cases:

Sharp (0px) – for flat, modern UI cards and table cells.
Rounded (8px) – the most common UI convention; used in buttons, cards, modals.
Pill / Circle (999px) – for badges, tags, avatar images, and CTA buttons.
Diagonal (999px / 0px alternating) – for creative asymmetric design elements popular in landing pages.

Lock Corners vs. Individual Corner Control

Explain the difference between uniform border-radius (e.g., border-radius: 12px) and the four-value shorthand (e.g., border-radius: 12px 0px 12px 0px). Describe when to use locked mode (buttons, cards) vs. individual mode (speech bubbles, organic blobs, custom UI shapes).

Understanding the CSS Output

Break down the generated code:

css

border-radius: 12px 12px 12px 12px;

Explain the order: top-left → top-right → bottom-right → bottom-left (clockwise from top-left). Note the shorthand rules: if all four values are identical, a single value suffices (border-radius: 12px).

Common Use Cases for CSS Border Radius

Cover practical real-world applications:

Buttons – slight rounding (6–8px) improves clickability perception.
Cards & containers – 12–16px is the industry standard for SaaS UIs.
Avatar / profile images – 50% or 999px for circular crops.
Input fields – subtle rounding (4–8px) for modern form design.
Hero sections & banners – asymmetric radii for visual differentiation.
Tooltips & callout boxes – one sharp corner pointing to the trigger element.
Badges & tags – pill shape (999px) for labels, categories, and status indicators.

CSS Border Radius and Browser Compatibility

Note that border-radius is supported in all modern browsers (Chrome, Firefox, Safari, Edge) without vendor prefixes. Mention that older projects requiring IE8 support may need the -webkit-border-radius and -moz-border-radius prefixes, though these are obsolete in current development.

Tips for Using Border Radius in Web Design

Use consistent radii across your design system (e.g., 8px for inputs, 12px for cards, 999px for pills).
Avoid mixing too many different radii on a single page — it creates visual inconsistency.
For scalable UIs, prefer rem or em values so corners scale with the user's font size.
Combine border-radius with overflow: hidden when clipping child elements (e.g., rounded image cards).
Use large asymmetric values to create "organic blob" shapes, popular in modern landing page hero graphics.

Frequently Asked Questions

What is a CSS border radius generator?

A CSS border radius generator is a free online tool that lets you visually adjust the corner rounding of HTML elements and instantly outputs the correct border-radius CSS code, eliminating the need to write or guess values manually.

How do I generate a CSS border radius for a circle?

Set all four corner values to 999px (or 50% if the element is a perfect square). The CSS border radius generator provides a one-click preset for this shape.

Can I set different border radius values for each corner?

Yes. Uncheck the "Lock corners together" option in the generator, then drag each of the four sliders independently to set custom values for top-left, top-right, bottom-right, and bottom-left.

What units can I use for CSS border radius?

The border-radius property accepts px, %, em, rem, and vw/vh. The most common in practice are px for fixed UIs and % for fluid or circular shapes. This generator outputs px values for precision.

What is the CSS shorthand for border radius?

The shorthand border-radius: TL TR BR BL sets all four corners in clockwise order starting from the top-left. If all four values are equal, you can write a single value: border-radius: 12px.

Is the CSS border radius generator free to use?

Yes, the tool is completely free. No account or sign-up is required. Simply adjust the sliders, preview the result, and copy the generated code.

Does border-radius work on images?

Yes. Applying border-radius to an tag rounds its visible corners. To ensure child content (like an image inside a

) is also clipped, add overflow: hidden to the parent container.

What is the difference between border-radius and -webkit-border-radius?

-webkit-border-radius was an older vendor prefix required for Safari and Chrome before they adopted the standard border-radius property. Modern browsers no longer need it, and you can safely use border-radius without any prefix.

How do I create a pill-shaped button using CSS border radius?

Set border-radius to a large value like 999px. This forces fully rounded left and right ends regardless of the button's width, creating the classic pill shape used in modern UI design.

Can I use CSS border radius to create asymmetric shapes?

Yes. By setting different values for each corner — for example, border-radius: 999px 0 999px 0 — you can create diagonal, wave-like, or organic shapes. The generator's individual corner sliders make it easy to experiment visually before copying the code.