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CSS Border Radius Generator
Visual border-radius generator for each corner independently.
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You might also like our Favicon Generator. Check out our Contrast Ratio Checker. For related tasks, try our Placeholder Image Generator.
What Makes CSS Border Radius Generator Useful
- per-corner control that saves you time by automating a common step in the process
- live shape preview included out of the box, ready to use with no extra configuration
- copy CSS included out of the box, ready to use with no extra configuration
- Completely free to use with no registration, no account, and no usage limits
- Runs entirely in your browser — your data stays private and is never uploaded to any server
- Responsive design that works on desktops, tablets, and mobile phones
How to Use CSS Border Radius Generator
- Visit the CSS Border Radius Generator tool page. It works on any device and requires no downloads or sign-ups.
- Choose your design settings in the designated input area. The per-corner control option can help you format your input correctly. Labels and placeholders show you exactly what is expected.
- Adjust settings as needed. CSS Border Radius Generator offers live shape preview and copy CSS so you can tailor the output to your exact requirements.
- Press the action button and your result appears immediately. All computation happens in your browser, so there is zero latency.
- Check the output, then preview, copy, or export the result. You can process as many inputs as you want — there are no usage limits.
Insider Tips
- Export your results from CSS Border Radius Generator and save them in a design tokens file. This creates a single source of truth that your whole team can reference.
- Cross-reference your CSS Border Radius Generator output with accessibility guidelines. WCAG 2.1 AA requires specific contrast ratios, and getting this right early prevents costly rework.
- When working on responsive designs, test your values on both mobile and desktop by resizing the browser window while using this tool.
See CSS Border Radius Generator in Action
Creating rounded corners
Input
All corners: 12px
→
Output
border-radius: 12px;
A uniform border-radius gives smooth rounded corners. 12px is a popular choice for card components in modern UI design.
Creating a pill shape
Input
Border radius: 9999px
→
Output
border-radius: 9999px;
A very large radius on a shorter element creates a pill/capsule shape — commonly used for tags, badges, and buttons.
Comparison Overview
| Feature | Browser-Based (FastTool) | Desktop App (Figma/Photoshop) | Browser Extension |
|---|---|---|---|
| Cost | Free, no limits | $$$ license or subscription | Free with limitations |
| Privacy | 100% local processing | Local processing | May upload data |
| Installation | None — runs in browser | Large download + install | Browser extension install |
| Speed | Instant for quick tasks | Powerful for complex work | Lightweight but limited |
| Cross-Platform | Works everywhere | OS-specific versions | Browser-dependent |
| Updates | Always latest version | Manual updates needed | Auto-updates |
Understanding CSS Border Radius
The CSS border-radius property accepts one to four values, controlling the rounding of each corner. A single value (border-radius: 10px) rounds all corners equally. Two values set top-left/bottom-right and top-right/bottom-left. Four values set each corner individually, clockwise from top-left. The value can be a length (px, em, rem) or a percentage — where 50% on a square element creates a perfect circle, and 50% on a rectangle creates an ellipse. Values exceeding half the element's dimension are automatically clamped to prevent overlap.
The advanced syntax using the / separator creates asymmetric (elliptical) corners: border-radius: 50px / 25px creates corners that are wider than they are tall, producing a more organic shape than circular rounding. Complex shapes like iOS app icons (which use a specific 'squircle' curve that is not a simple border-radius) can be approximated with border-radius: 22% but are more accurately achieved with SVG clip paths. For interactive design, animating border-radius creates fluid shape-morphing effects — transitioning from a circle (50%) to a rounded rectangle (10px) or vice versa is a common UI animation pattern.
How It Works
Built with CSS and JavaScript, CSS Border Radius Generator processes design parameters using mathematically precise algorithms with capabilities including per-corner control, live shape preview, copy CSS. The tool uses the browser's built-in color parsing for accuracy and generates output compatible with all modern CSS specifications. Visual previews are rendered using the same engine that displays websites, so what you see matches what your users will see. All calculations happen instantly in your browser with no server roundtrip.
Worth Knowing
The golden ratio (1.618) has been used in design and architecture for thousands of years, from the Parthenon in ancient Greece to modern Apple product designs.
The average person encounters between 4,000 and 10,000 design elements (ads, logos, icons, UI components) per day.
Concepts to Know
- HEX Color Code
- A six-digit hexadecimal representation of a color used in web design. Each pair of digits represents the Red, Green, and Blue components, with values from 00 to FF.
- Responsive Design
- A web design approach that makes pages render well on a variety of screen sizes. Responsive designs use flexible grids, flexible images, and CSS media queries to adapt to the viewing environment.
- Golden Ratio
- An irrational number approximately equal to 1.618, found throughout nature and used in art and design for aesthetically pleasing proportions.
- Typography Scale
- A set of harmoniously sized text values used in a design system. Common scales are based on mathematical ratios like the golden ratio (1.618) or the perfect fourth (1.333).
FAQ
What is CSS Border Radius Generator?
Part of the FastTool collection, CSS Border Radius Generator is a zero-cost design tool that works in any modern browser. Visual border-radius generator for each corner independently. Capabilities like per-corner control, live shape preview, copy CSS are available out of the box. Because it uses client-side JavaScript, your data stays private throughout the entire process.
How to use CSS Border Radius Generator online?
Using CSS Border Radius Generator is straightforward. Open the tool page and you will see the input area ready for your data. Visual border-radius generator for each corner independently. The tool provides per-corner control, live shape preview, copy CSS so you can customize the output to your needs. Once you have your result, use the copy or download button to save it. Everything runs in your browser — no server round-trips, no waiting.
Does CSS Border Radius Generator work offline?
After the initial load, yes. CSS Border Radius Generator does not make server requests during operation, so losing your connection will not affect the tool. Save the page as a bookmark for easy access when you are back online.
Why choose CSS Border Radius Generator over other design tools?
Unlike many design tools, CSS Border Radius Generator does not require registration, does not upload your data, and does not lock features behind a paywall. The client-side architecture delivers instant results while keeping your information private.
What languages does CSS Border Radius Generator support?
You can use CSS Border Radius Generator in any of 21 supported languages. The tool uses a client-side translation system that updates the entire interface without a page reload. This includes full support for right-to-left scripts like Arabic and Urdu.
Do I need to create an account to use CSS Border Radius Generator?
No account is required. CSS Border Radius Generator is ready to use the moment you open the page. There are no sign-up forms, no email verifications, and no login walls. Your usage is completely anonymous.
Common Use Cases
Print Design Preparation
Use CSS Border Radius Generator to convert and verify design values when preparing files for print production.
Responsive Design Testing
Test how your design values translate across screen sizes by using CSS Border Radius Generator to calculate responsive breakpoints, font scales, and spacing systems.
Design Handoff to Developers
Use CSS Border Radius Generator to generate precise design specifications and tokens that developers can copy directly into code during the handoff process.
Accessibility Audits
Ensure your designs meet accessibility standards by using CSS Border Radius Generator to check contrast ratios, font sizes, and other WCAG-related parameters.
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