What does border-radius do?

The CSS border-radius property rounds the corners of an element. You can use absolute units (px, em) or percentages to create circles/ovals.

When should I use % vs px?

Use % when you want radius relative to element size (good for circles/rounded shapes). Use px or em for fixed radii independent of size.

What are elliptical radii?

Elliptical radii use X / Y values (e.g. 30px 10px / 20px 40px) allowing different horizontal and vertical radii for corners.

Is border-radius cross-browser compatible?

Yes — modern browsers support border-radius without vendor prefixes. Old browsers (very old IE) may have limited support.

How can I export my radii?

This tool supports copying CSS, exporting a .css file, and exporting/importing presets as JSON.

Does it support accessibility and keyboard control?

Yes. Controls are labeled, keyboard-focusable and the UI includes high-contrast/dark modes and an RTL toggle for demonstration.

Border Radius Generator

The Border Radius Generator is a powerful, professional, and easy-to-use online tool designed to help developers, designers, and UI/UX creators generate perfect CSS border-radius values in seconds. Whether you want smooth rounded corners, creative blob shapes, or fully custom elliptical radii, this tool lets you visually design every corner with precision. No more guessing values or refreshing browsers repeatedly — simply adjust sliders, preview instantly, and copy clean, production-ready CSS with one click. Built with a modern, responsive UI and advanced customization options, it supports px, %, and em units, along with four-corner independent control, preset shapes, live previews, and export features. The generator is ideal for beginners learning CSS, as well as professionals crafting complex UI elements. Fast, accurate, and mobile-friendly, it saves time and enhances workflow, making it an essential part of every front-end toolkit. Explore unlimited border-radius possibilities effortlessly.

Create CSS border-radius visually — px, %, elliptical, presets.

Dark Preview background

Controls

Adjust corners (top-left, top-right, bottom-right, bottom-left). Use px, %, or em. Toggle elliptical values when needed.

Uniform radius

Unit

Elliptical (X / Y)

Top-left

Top-right

Bottom-right

Bottom-left

Preview background

Device size

Resize: drag handle

Import presets

Live preview

Box size:

300px

Generated CSS

Shorthand & expanded

Use border-radius to round corners — choose px or % for different effects.

Presets & Favorites

Saved shapes

What is CSS Border Radius?

The CSS border-radius property is used to create rounded corners on HTML elements. It allows developers and designers to control how sharp or smooth the corners of boxes, buttons, images, cards, and other UI components appear on a webpage.

By adjusting the border-radius values, you can create subtle rounded corners, pill-shaped buttons, or even perfect circles. This property plays a major role in modern UI and responsive web design.

Why Use Rounded Corners in Web Design?

Rounded corners improve visual appeal and user experience. Modern websites prefer soft edges because they look clean, professional, and easy on the eyes.

Enhances button and call-to-action design
Improves card-based layouts
Makes images and avatars look modern
Helps create friendly and accessible UI elements

How to Use the Border Radius Generator

This Border Radius Generator allows you to visually create CSS border-radius values without writing code manually.

Adjust the radius values for each corner using sliders or inputs
Preview the rounded shape instantly
Copy the generated CSS code
Paste it into your HTML or CSS file

The tool helps save time and reduces errors when working with complex corner values.

CSS Border Radius Examples

 /* Same radius on all corners */ 
   .box { border-radius: 12px; } 
   /* Different values for each corner */ 
   .card { border-radius: 20px 5px 20px 5px; } 
   /* Perfect circle */ 
   .avatar { border-radius: 50%; }

These examples show how different values affect element shapes. Using percentages is ideal for responsive and circular designs.

Common Use Cases

Buttons and navigation menus
Profile images and avatars
Cards, panels, and UI containers
Responsive image layouts

Designers often use border radius to create visually balanced layouts across desktop and mobile devices.

Tips & Best Practices

Use px values for precise UI control
Use % values for responsive and circular elements
Combine border-radius with overflow: hidden for images
Avoid extremely large radius values on small elements

Frequently Asked Questions (FAQ)

What units can I use with border-radius?

You can use pixels (px), percentages (%), em, or rem depending on your design needs.

How do I make a perfect circle?

Set equal width and height and use border-radius: 50%;.

Does border-radius work in all browsers?

Yes, it is supported by all modern browsers.

Can I use different values for each corner?

Yes, you can define up to four values for top-left, top-right, bottom-right, and bottom-left corners.

Is this Border Radius Generator free?

Yes, this tool is completely free and runs directly in your browser.

Privacy & Data Safety

This Border Radius Generator runs entirely in your browser. No data is stored, uploaded, or shared with any server, ensuring complete privacy and security.

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