Border Radius Visualizer Online

Create custom rounded corners for your website with this free Border Radius Generator. Adjust the top-left, top-right, bottom-right, and bottom-left corner radius independently, preview the result instantly, and copy production-ready CSS with one click.

Whether you're designing buttons, cards, badges, forms, avatars, or modern user interfaces, this tool makes it easy to generate accurate CSS border-radius values without writing code manually.

Everything runs entirely in your browser. No data is uploaded or stored.

What Is CSS border-radius?

The CSS border-radius property rounds the corners of HTML elements. It is one of the most widely used CSS properties for creating modern user interfaces, allowing developers to soften sharp corners or create circles, pills, and custom organic shapes.

Instead of manually experimenting with different values, this online Border Radius Generator provides a live preview so you can visually adjust each corner and instantly generate the corresponding CSS.

Rounded corners are commonly used in buttons, cards, navigation menus, input fields, profile images, badges, dialog boxes, product cards, mobile interfaces, and dashboard components.

Border Radius Properties Explained

Top-Left Radius — Controls how rounded the upper-left corner of the element appears.

Top-Right Radius — Adjusts the curvature of the upper-right corner.

Bottom-Right Radius — Changes the roundness of the lower-right corner.

Bottom-Left Radius — Controls the curvature of the lower-left corner.

By setting different values for each corner, you can create unique shapes ranging from subtle rounded rectangles to modern asymmetric designs.

CSS Shorthand Explained

The border-radius property supports one to four values.

One Value — All four corners use the same radius.

border-radius: 12px;

Two Values — First applies to top-left & bottom-right; second to top-right & bottom-left.

border-radius: 12px 24px;

Three Values — Top-left, then top-right & bottom-left, then bottom-right.

border-radius: 12px 24px 8px;

Four Values — Each corner receives its own value (top-left, top-right, bottom-right, bottom-left).

border-radius: 12px 24px 8px 16px;

Example CSS

Rounded Button

button {
  border-radius: 8px;
}

Pill Button

button {
  border-radius: 9999px;
}

Card Component

.card {
  border-radius: 16px;
}

Asymmetrical Shape

.box {
  border-radius: 40px 8px 32px 12px;
}

Design Tips

• Use 4–8px for subtle rounding.
• Use 12–16px for modern cards and panels.
• Use 9999px for pill-shaped buttons.
• Keep corner radii consistent across similar UI components.
• Combine different corner values to create unique visual styles.
• Avoid excessive rounding on very small elements.
• Test your design on different screen sizes.

• Designing rounded buttons
• Creating modern cards
• Styling navigation menus
• Creating badges and labels
• Designing avatars
• Building dashboard widgets
• Creating pricing cards
• Styling forms and inputs
• Designing product cards
• Creating notification panels
• Building mobile app interfaces
• Experimenting with organic UI shapes

Although border-radius is a simple CSS property, finding the perfect combination of values can take time. A visual generator allows you to:

• Preview changes instantly
• Experiment without writing CSS manually
• Create consistent UI components
• Generate clean shorthand CSS
• Save development time
• Improve design accuracy
• Build professional-looking interfaces faster

The CSS border-radius property is fully supported by all modern browsers, including Google Chrome, Mozilla Firefox, Microsoft Edge, Safari, and Opera. Vendor prefixes are no longer required.