Border Radius Generator
Frequently Asked Questions
What is CSS border-radius and why is it important in web design?
CSS border-radius controls the curvature of an element's corners, transforming sharp rectangular edges into smooth, rounded shapes. Modern UI design relies on it for buttons, cards, avatars, and containers. Rounded corners feel friendlier and more polished, which is why every major design system — from Material Design to Tailwind — uses them as a foundational property.
How do I create a perfect circle using border-radius?
Apply border-radius: 50% to any element with equal width and height. For example, set width: 100px; height: 100px; border-radius: 50% and the element becomes a perfect circle. If width and height differ, 50% produces an ellipse instead. Add overflow: hidden to the element to clip child images so they conform to the circular shape.
What does the slash notation mean in border-radius, such as 50px / 30px?
The slash separates horizontal and vertical radii for each corner. border-radius: 50px / 30px sets a 50px horizontal radius and 30px vertical radius on all corners, creating elliptical curves rather than circular ones. This advanced syntax enables organic blob shapes and asymmetric curves that cannot be achieved with standard single-value border-radius declarations.
What is the difference between the border-radius shorthand and the four individual corner properties?
The shorthand border-radius sets all corners in one declaration using 1 to 4 values. Individual properties — border-top-left-radius, border-top-right-radius, border-bottom-right-radius, border-bottom-left-radius — control specific corners precisely. Shorthand is convenient for uniform or symmetric rounding, while individual properties are best when you need to override only one corner from a shared base style.
Does CSS border-radius require vendor prefixes or browser fallbacks?
No. CSS border-radius is fully supported across all modern browsers — Chrome, Firefox, Safari, Edge, and Opera — without any vendor prefixes. Support dates back to Chrome 4, Firefox 4, Safari 5, and IE 9. For any project targeting browsers released after 2011, you can use border-radius in production without polyfills, fallbacks, or additional JavaScript.
Recommended
Related Tools
Lorem Ipsum Generator
Generate lorem ipsum placeholder text instantly — choose paragraphs, sentences, or words with one click.
Color Picker & Converter
Pick colors and convert between HEX, RGB, RGBA, HSL, HSV, CMYK and CSS color formats instantly.
Unit Converter
Convert length, weight, temperature, area, volume, speed, time, and data units instantly — all in one free tool.
Percentage Calculator
Calculate percentages, find increase/decrease, reverse percent, and tip — four modes, instant results.
Text Diff Checker
Compare two texts side by side and highlight every addition, deletion, and change instantly.