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ToolsDesignBorder Radius Generator

Border Radius Generator

Free CSS border radius generator. Visually adjust 8-value border radius handles, preview organic blob shapes, and copy CSS code instantly with zero lag.

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Notice unexpected behavior or calculation inaccuracy?Report an issue
Client-side processingInput data is processed in client memory and discarded on tab close.
W3C Specification EngineAccurate WCAG contrast ratios and modern CSS layout properties.
Direct Output & ExportInstant clipboard copy or formatted output ready for your workflow.

Technical Overview: How Border Radius Generator Works

The CSS Border Radius Generator and 8-value CSS border radius generator creates smooth rounded corners, pill shapes, and organic fluid blob geometries for modern web interfaces. Adjust individual corner radii visually and copy clean, cross-browser CSS.

Generates standard CSS `border-radius` declarations with full support for both 4-corner single radius and 8-value elliptical radius syntax (`border-radius: horizontal-radii / vertical-radii`). Enables precise control over all 4 corners and independent axis curves.

Practical Examples & Usage

Simple Rounded Corners

Input:All corners set to 12px
Output:border-radius: 12px;

Creates a smooth, uniform rounded corner on all sides.

8-Value CSS Border Radius Generator: Asymmetric Organic Blob Shape

Input:Top-Left: 60% 40%, Top-Right: 40% 60%, Bottom-Right: 30% 70%, Bottom-Left: 70% 30%
Output:border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;

The 8-value CSS syntax uses a slash (/) to define separate horizontal and vertical radii for each corner, creating organic asymmetrical shapes.

Real-World Applications & Use Cases

  • Designing rounded corners for website buttons, cards, dialogs, and hero image frames.
  • Generating 8-value CSS border radius organic blob shapes for background decorations and modern landing pages.
  • Creating perfect circle avatars or pill-shaped badges and action buttons.

How to use Border Radius Generator

  1. Drag the sliders on the four sides of the preview box to adjust the border radius.
  2. Toggle between simple (all corners equal) and advanced (individual corner control) modes.
  3. Watch the shape dynamically morph in the interactive preview area.
  4. Review the generated CSS code block below the preview.
  5. Click "Copy CSS" to copy the generated rules to your clipboard.

Edge Cases & Limitations

  • •If you use percentages (like 50%), your shape might look stretched if your box is not a perfect square.
  • •If your box has `overflow: hidden`, any text inside it will get cut off at the rounded corners.

Recommended Best Practices

  • •Keep your corner sizes consistent across your website (like using 8px everywhere).
  • •If you want a pill-shaped button, use a very large pixel number like `9999px` instead of percentages.

Data Handling Profile

Client-side processing
Processing Runtime
All text transformations, mathematical calculations, code formatting, and asset conversions execute locally inside your web browser sandbox.
Memory & Storage
Processed text and parameters are handled in browser memory. Optional configuration preferences (like dark/light theme) are stored in your browser local storage for convenience.
Network Transmission
Tool inputs and calculation results are processed in browser memory and are not uploaded to Outlivo application servers.

Frequently Asked Questions

What browsers support the CSS border-radius property?

The CSS border-radius property is universally supported across all modern web browsers, including Chrome, Firefox, Safari, and Edge.

How does an 8-value CSS border radius generator work?

The CSS border-radius property allows you to define horizontal and vertical radii separated by a slash (e.g., 30% 70% 70% 30% / 30% 30% 70% 70%). This 8-value border radius generator lets you control each radius visually to produce organic shapes and fluid UI cards.

Can I create asymmetrical shapes?

Yes! By using the advanced mode, you can control the X and Y radius of each of the four corners independently, allowing for highly complex, organic shapes.

Is the generated CSS production-ready?

Yes, the CSS generated is perfectly formatted and ready to be dropped into any modern web development project without additional tweaking.

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