Border Radius Generator
Easily generate and preview CSS border-radius configurations.
Design tool guide · CSS generators and visual effects
About Border Radius Generator
The Border Radius Generator helps create CSS corner rounding values and preview the shape they make. It is useful when designing buttons, cards, badges, and other elements, but the result still needs to fit the element size and visual style of the site.
CSS generators turn visual settings into code that can be reviewed and added to a stylesheet. The preview helps you see the effect while you adjust values, but the generated CSS is still a starting point: check it in your own layout, browser targets, and design system before publishing.
How to Use This Tool
- 1.Adjust the corner radius controls or presets to shape the preview.
- 2.Inspect whether corners should match or use different values, and check how the shape looks at the actual component size.
- 3.Copy the generated CSS and paste it into a stylesheet or design system, then test it at responsive sizes.
Key Details About Border Radius Generator
1.Preview and code work together
Change a value and compare the preview with the generated CSS. This makes properties such as shadows, transforms, borders, opacity, and gradients easier to understand than editing a long declaration by memory.
2.CSS values depend on context
A valid declaration can look different when it is placed on another element, layered over a different background, or combined with existing styles. Check the selector, stacking order, dimensions, and inherited rules in the real page.
3.Responsive layouts need testing
Grid and flexbox settings often depend on available space and child content. Review the result at narrow and wide viewport sizes, and make sure the layout still works when text wraps or content is added.
4.Browser support is part of the design
Some decorative effects have uneven support or need a fallback. Keep essential content readable if an effect such as backdrop blur, a custom scrollbar, or a complex transform is unavailable.
How the Tool Works
CSS `border-radius` accepts lengths or percentages and can specify one value for all corners or separate values for each corner. Percentages are relative to the element's dimensions, which can create elliptical corners when width and height differ.
Example
A rule such as `border-radius: 12px` rounds all four corners by the same radius. A value of `50%` can make a square element appear circular.
Where You Can Use Border Radius Generator
Build consistent corner styles for cards, controls, badges, avatars, and decorative shapes. Save the output as a design token if the same radius is used across many components.
Prototyping a component
Explore a shadow, radius, transform, gradient, or decorative shape before moving the chosen values into the component stylesheet.
Learning a CSS property
Adjust one control at a time and watch how the preview changes. Then compare the output with the property's documentation and try it in a small local page.
Building a page layout
Use grid or flexbox output as a first draft for columns, gaps, alignment, and wrapping. Check long labels, empty states, and mobile widths before relying on it.
Sharing a visual recipe
Copy the generated declaration into a design handoff or code review so another person can reproduce the same starting point.
Tips for Better Results
- Make one change at a time so you can tell which property caused the visual difference.
- Test the copied CSS in the actual component; a preview cannot include your page's other styles.
- Check keyboard focus, readable contrast, and motion preferences when creating decorative effects.
- Use responsive breakpoints and fallback values where the design must work across browsers and screen sizes.
- Keep generated declarations that you need, and remove unused or duplicate rules before shipping.
Technical Limits and Review
The preview may not match the exact dimensions, overflow, borders, or neighboring layout of your production component. Very large radii can be constrained by CSS and may produce a different result than expected.
A preview only represents the controls and sample element shown by the tool. It does not inspect your application's CSS cascade, content, browser support policy, accessibility, or production layout. Validate the code in its intended component and remove declarations that do not fit your project.
Frequently Asked Questions
Can each corner have its own radius?
Yes, CSS supports separate corner values, and the generator exposes corner controls.
Does 50% always make a circle?
It makes a circle when the element is square; a rectangular element becomes an ellipse-like shape.
Is the generated code ready for every browser?
`border-radius` is widely supported, but test within your target layout and browser requirements.
Can I paste the generated CSS directly into a website?
Usually it is a useful starting point, but check selectors, browser support, responsive behavior, and the rest of your stylesheet first.
Why does the effect look different in my project?
The page may have different dimensions, backgrounds, inherited styles, stacking contexts, or browser rendering.
Will the generated layout work on mobile?
The code depends on the selected settings and content. Test narrow widths and add responsive rules if needed.
Does a preview guarantee accessibility?
No. Check contrast, focus visibility, motion, and usability with the real content and controls.