CSS Border Radius Generator

Generate CSS border radius code with real-time visual preview.

Generate CSS border radius code with real-time visual preview. Control individual corners, create rounded buttons, cards, and circular elements. Copy CSS code with vendor prefixes instantly.

What is CSS Border Radius Generator?

CSS Border Radius Generator is a free online tool that helps you create perfectly rounded corners for your web elements. Whether you're designing modern buttons, elegant cards, or circular avatars, this tool provides a visual, real-time preview of your border radius settings and generates clean, cross-browser compatible CSS code.

With our border radius generator, you can:

Control each corner individually or lock them together for uniform rounding
Preview in real-time with different shape presets (Box, Card, Button)
Generate CSS code with vendor prefixes for maximum browser compatibility
Work seamlessly in both light and dark themes
Copy instantly with one-click CSS code copying

Understanding CSS Border Radius

The border-radius property is one of the most popular CSS properties for creating modern, visually appealing designs. It allows you to round the corners of elements, creating everything from subtle button effects to perfect circles.

Border Radius Syntax

The CSS border-radius property can be written in several ways:

Single Value (All Corners Equal):

border-radius: 8px;
/* All four corners have 8px radius */

Two Values (Diagonal Corners):

border-radius: 10px 20px;
/* Top-left & bottom-right: 10px */
/* Top-right & bottom-left: 20px */

Three Values:

border-radius: 10px 20px 15px;
/* Top-left: 10px */
/* Top-right & bottom-left: 20px */
/* Bottom-right: 15px */

Four Values (Individual Corners):

border-radius: 10px 15px 20px 25px;
/* Order: top-left, top-right, bottom-right, bottom-left */

Individual Corner Properties:

border-top-left-radius: 10px;
border-top-right-radius: 15px;
border-bottom-right-radius: 20px;
border-bottom-left-radius: 25px;

Key Features of Our Border Radius Generator

Visual Real-Time Preview

See your border radius changes instantly with a live preview. No need to switch between your code editor and browser.

Lock/Unlock Corner Controls

Locked Mode: All corners change together - perfect for uniform rounding
Unlocked Mode: Control each corner independently - ideal for creative, asymmetric designs

Shape Presets

Quick-start templates for common use cases:

Box: Standard square element (150x150px)
Card: Rectangular card layout (180x200px)
Button: Typical button dimensions (120x45px)

Color Visualization

Choose from 5 color presets to better visualize how your border radius looks with different backgrounds.

Dark Theme Support

Seamlessly works in both light and dark modes, automatically adjusting preview backgrounds for optimal visibility.

One-Click Copy

Generated CSS includes vendor prefixes for maximum browser compatibility:

-webkit-border-radius (Safari, older Chrome)
-moz-border-radius (older Firefox)
border-radius (all modern browsers)

How to Use the CSS Border Radius Generator

Step 1: Choose Your Control Mode

Click the Lock/Unlock button in the top-right of the controls:

🔒 Locked: All sliders move together (uniform corners)
🔓 Unlocked: Control each corner separately (custom shapes)

Step 2: Adjust Corner Radius Values

Use the sliders to set radius for each corner (0-100px):

Top Left: Controls the upper-left corner
Top Right: Controls the upper-right corner
Bottom Right: Controls the lower-right corner
Bottom Left: Controls the lower-left corner

When locked, adjusting any slider changes all corners simultaneously.

Step 3: Select a Shape Preset (Optional)

Choose a preset to see how your border radius looks on different element types:

Box: Square element for general use
Card: Rectangular card component
Button: Button-sized element

Step 4: Pick a Background Color (Optional)

Select from 5 color presets to visualize your design with different backgrounds. This helps you see how the rounded corners interact with your color scheme.

Step 5: Copy Your CSS Code

Click the Copy button to copy the generated CSS code with all vendor prefixes. Paste it directly into your stylesheet.

Step 6: Reset if Needed

Click Reset to return all values to their defaults and start fresh.

Common Use Cases and Examples

Rounded Buttons

Modern buttons typically use subtle border radius for a friendly, approachable look:

/* Subtle rounded button */
border-radius: 6px;

/* Pill-shaped button */
border-radius: 25px;

Recommended values: 4-8px for subtle, 20-50px for pill-shaped

Card Components

Cards benefit from moderate rounding for a clean, modern appearance:

/* Standard card */
border-radius: 12px;

/* Prominent card */
border-radius: 16px;

Recommended values: 8-16px

Circular Elements

Create perfect circles for avatars, badges, or icons:

/* Perfect circle (element must be square) */
border-radius: 50%;

/* Or use a very large value */
border-radius: 100px;

Tip: Element width and height must be equal for perfect circles

Asymmetric Designs

Create unique shapes with different corner values:

/* Speech bubble effect */
border-radius: 20px 20px 20px 0;

/* Folded corner effect */
border-radius: 10px 10px 30px 10px;

Subtle rounding for better UX:

border-radius: 8px;

Recommended values: 6-12px

Image Containers

Soften image edges:

/* Slightly rounded */
border-radius: 8px;

/* Circular avatar */
border-radius: 50%;

Border Radius Best Practices

1. Consistency is Key

Use consistent border radius values across similar elements in your design system:

Buttons: 6px
Cards: 12px
Modals: 8px
Images: 4px

2. Consider Element Size

Larger elements can handle larger border radius values. Small elements should use smaller values to avoid looking distorted.

3. Match Your Brand

Modern/Playful: Larger radius (12-20px)
Professional/Formal: Smaller radius (4-8px)
Minimalist: Very subtle (2-4px)

4. Test Responsiveness

Border radius values don't scale automatically. Test how your rounded corners look on different screen sizes.

5. Percentage vs Pixels

Pixels: Absolute control, consistent across element sizes
Percentage: Scales with element size, useful for responsive designs

6. Performance Considerations

Border radius is hardware-accelerated in modern browsers, so it has minimal performance impact. However, avoid animating border-radius on many elements simultaneously.

Browser Compatibility

The border-radius property is widely supported across all modern browsers:

Chrome: Version 4 and above - Full support
Firefox: Version 4 and above - Full support
Safari: Version 5 and above - Full support
Edge: All versions - Full support
Opera: Version 10.5 and above - Full support
iOS Safari: Version 3.2 and above - Full support
Android Browser: Version 2.1 and above - Full support

Note: Our generator includes vendor prefixes (-webkit-, -moz-) for older browser versions, ensuring maximum compatibility.

Advanced Border Radius Techniques

Elliptical Corners

Create elliptical (oval) corners instead of circular ones:

/* Horizontal radius / Vertical radius */
border-radius: 50px / 25px;

/* Different for each corner */
border-top-left-radius: 40px 20px;

Percentage-Based Radius

Use percentages for responsive designs:

/* Creates pill shape on any size */
border-radius: 50%;

/* Subtle responsive rounding */
border-radius: 5%;

Combining with Other Properties

Border radius works beautifully with:

.card {
  border-radius: 12px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  overflow: hidden; /* Clips child content to rounded corners */
}

Frequently Asked Questions (FAQ)

What is the CSS border-radius property?

The border-radius CSS property rounds the corners of an element's outer border edge. You can specify one, two, three, or four values to control each corner individually or uniformly.

How do I make a perfect circle with CSS?

To create a perfect circle, set border-radius: 50% on a square element (where width equals height). For example: width: 100px; height: 100px; border-radius: 50%;

What's the difference between px and % for border-radius?

Pixels (px): Absolute value, stays the same regardless of element size
Percentage (%): Relative to element dimensions, scales automatically. 50% creates circles/pills.

Can I use different border radius for each corner?

Yes! Use four values: border-radius: 10px 15px 20px 25px; (top-left, top-right, bottom-right, bottom-left) or individual properties like border-top-left-radius: 10px;

Why should I use vendor prefixes for border-radius?

Vendor prefixes (-webkit-, -moz-) ensure compatibility with older browsers. While modern browsers don't need them, including them ensures your design works everywhere.

What's the maximum border-radius value I can use?

There's no strict maximum, but values larger than 50% or half the element's smallest dimension won't create additional rounding. For a 100px square, values above 50px (or 50%) create the same circular effect.

How do I create a pill-shaped button?

Use a large border-radius value (e.g., border-radius: 50px;) or border-radius: 50%; on a rectangular button. The height determines the pill's roundness.

Does border-radius affect performance?

Border-radius has minimal performance impact as it's hardware-accelerated in modern browsers. However, avoid animating it on many elements simultaneously.

Can I animate border-radius?

Yes! Border-radius can be animated with CSS transitions or animations:

.element {
  border-radius: 10px;
  transition: border-radius 0.3s ease;
}
.element:hover {
  border-radius: 20px;
}

How do I make rounded corners only on top or bottom?

Set specific corners to 0:

/* Rounded top only */
border-radius: 10px 10px 0 0;

/* Rounded bottom only */
border-radius: 0 0 10px 10px;

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