Border Radius Generator
Build custom rounded corners, preview the shape instantly, and copy clean CSS for buttons, cards, images, and layout elements.
Border Radius CSS Generator Tool
Generated CSS
How to Use
- Enter the shape size in pixels for the preview box so you can test your rounded corner design.
- Type values for top left, top right, bottom right, and bottom left radius in pixels.
- Click the Generate CSS button to calculate the border radius shorthand and update the live preview box.
- Review the generated CSS output and copy it for use in your website, app interface, or design prototype.
- Use the Clear button to reset all inputs, hide the result, and start again with new values.
Key Features
Separate Corner Control
Set a different radius for each corner to create custom cards, asymmetric buttons, and modern UI shapes.
Live Visual Preview
See the rounded shape update instantly after calculation so you know exactly how the CSS will look.
CSS Shorthand Output
Get clean border-radius code that is ready to paste into stylesheets, inline styles, or component files.
Useful for Responsive UI
Test common radius values for app cards, product tiles, form fields, profile images, and mobile buttons.
Fast Input Validation
The tool checks invalid or negative values so you can avoid broken code and visual surprises.
One-Click Copy
Copy the generated CSS quickly and continue working in Figma handoff files, HTML, CSS, or frameworks.
Formula and How It Works
A CSS border radius can be written as one value for all corners or four values in clockwise order.
border-radius: top-left top-right bottom-right bottom-left;
Variables: top-left, top-right, bottom-right, and bottom-left are the corner radius values, usually in pixels.
If all four values are the same, the shorthand can be simplified to one number. If opposite corners match, CSS can also be shortened, but this tool outputs a clear four-value version so it is easy to read and edit.
The preview box uses the same values in the browser, which means the shape you see is based on the exact CSS code shown in the result panel.
Practical Examples
🇮🇳 Aditi — Mumbai
Scenario: Aditi wants a product card with softer corners for a fashion storefront.
Calculation: 16px 16px 16px 16px
Verified Result: border-radius: 16px 16px 16px 16px;
🇮🇳 Rohit — Bengaluru
Scenario: Rohit is designing a CTA button with a pill-like look.
Calculation: Width 220px, height 56px, radius 28px 28px 28px 28px
Verified Result: border-radius: 28px 28px 28px 28px;
🇺🇸 Emma — Austin
Scenario: Emma needs an asymmetric card header for a dashboard panel.
Calculation: 24px 8px 24px 8px
Verified Result: border-radius: 24px 8px 24px 8px;
What Is Border Radius Generator?
A border radius generator helps you create rounded corners for web elements without guessing CSS values manually. Instead of editing code over and over, you can enter numbers, preview the result, and copy the final CSS in a few seconds.
This is especially useful when you are styling buttons, cards, banners, profile images, product blocks, or dashboard components. Rounded corners affect the visual personality of a layout more than many people expect. A small 6px radius feels sharp and structured, while 24px feels softer and more modern.
If you are working across devices, teams, or design systems, a generator also helps you stay consistent. You can quickly test corner values, compare shapes, and standardize styling decisions before implementation.
Want a deeper explanation?
Read our detailed guide to understand where rounded corners work best, common mistakes, and how to choose radius values for different interfaces.
Read the blog post →Frequently Asked Questions
Is this tool free to use?
Yes, you can use this border radius generator in your browser without payment or registration.
What does border-radius do in CSS?
The border-radius property rounds the corners of an element. You can apply one value to all corners or separate values to each corner.
Can I set different values for each corner?
Yes. This tool lets you enter separate values for top left, top right, bottom right, and bottom left corners and then creates the matching CSS shorthand.
Does the tool generate valid CSS shorthand?
Yes. It creates standard CSS border-radius code that works in modern browsers.
Can I use percentage values instead of pixels?
This version is focused on pixel values for simple and precise control. If you need percentages, you can replace px with % manually after copying the code.
Why does a large radius sometimes create a pill or circle?
When the radius becomes large relative to the width and height, the corners curve more strongly. On a square, a high radius can produce a circle. On a rectangle, it can create a pill shape.
Will the preview match real CSS output?
Yes. The preview uses the same border-radius values shown in the generated CSS, so the visual result closely matches browser output.
Can I use this for buttons, cards, and images?
Yes. Border radius is commonly used for buttons, cards, images, badges, containers, and many other interface elements.
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