CSS Border Radius Generator
About Tool
Modern web design often utilizes rounded corners to create a softer, more professional aesthetic. The border-radius property in CSS can range from a simple uniform value to a complex multi-point declaration. This generator provides a visual interface to manipulate these values in real-time, allowing you to create everything from subtle rounded buttons to organic, asymmetrical shapes with ease.
Uniform vs. Custom Corner Control
By default, the tool allows you to Link All Corners, meaning a change to one slider updates the entire element. This is ideal for standard cards or buttons. If you need a more unique shape—such as a leaf-like box or a speech bubble—you can uncheck the link option to gain independent control over the Top Left, Top Right, Bottom Right, and Bottom Left radii. The live preview updates immediately as you move the sliders, showing exactly how the final element will appear in your browser.
Measurement Units and Output
Depending on your layout needs, you might prefer different units of measurement. The tool supports both Pixels (px) for fixed-size rounding and Percentage (%) for fluid shapes (like turning a square into a perfect circle using 50%). Once you are satisfied with the shape, the Copy CSS button allows you to grab the code for immediate use. If your design requires specific color coordination, you might want to pair this with our RGBA to HEX tool to ensure your borders and backgrounds match your project's color palette.
Design Tips for Rounded Corners
When designing interfaces, consistency is key. Using the same radius for all buttons creates a unified feel. For nested elements, remember the "inner radius" rule: if you have a rounded box inside another rounded box, the inner radius should typically be smaller than the outer one to maintain a consistent gap. If you're working on a dark mode design, you might use our HEX to HSL tool to easily adjust the lightness of your element's borders alongside these rounded corners.
Frequently Asked Questions
How do I make a perfect circle?
Ensure your element is a square (equal width and height), set the Measurement Unit to Percentage (%), and set all corner values to 50%.
What is the difference between px and % in border-radius?
Pixels (px) define a fixed radius that stays the same regardless of the box size. Percentage (%) is relative to the size of the element, meaning the curve will stretch if the box is not a perfect square.
Can I copy the code for just one corner?
The Generate CSS button creates a shorthand property for all corners. If you only need one, you can manually extract that specific value from the output string.
Does this support the "slash" syntax for elliptical corners?
This generator currently focuses on standard circular rounding for each corner, which covers the vast majority of web design use cases.
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