HTML & CSS ToolsFree Tool

Border Radius Generator

Provided byDevBoltdevbolt.dev

Designs CSS border-radius visually with per-corner controls and unit selection.

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Screenshot of Border Radius Generator on DevBolt
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About this tool

What Border Radius Generator does

A visual CSS border-radius generator that lets users adjust the curvature of each corner independently using per-corner sliders. The interface provides a live preview panel where changes appear instantly, and users can toggle between pixels, percentages, ems, and rems to suit different design needs. The tool includes preset options for common shapes like pill, circle, leaf, and teardrop, which apply specific radius values with one click. All processing occurs within the browser, ensuring that no data is sent to external servers.

Step by step

How to use the DevBolt Border Radius Generator

  1. 1

    Open the Border Radius Generator on DevBolt

  2. 2

    Adjust the four corner sliders (top-left, top-right, bottom-right, bottom-left) to set the desired curvature

  3. 3

    Select a unit from the dropdown (px, %, em, rem) to apply to all corners or linked corners

  4. 4

    Copy the generated CSS code from the output panel with a single click

Is it right for you

Best for

Web designers and developers who need to quickly prototype rounded corners for UI components without manually writing and testing CSS values.

Limitations

  • No unit switching for individual corners; the selected unit applies uniformly
  • Preset shapes may require fine-tuning to match specific design dimensions
  • Advanced elliptical corner controls (separate horizontal and vertical radii) are not available
Questions

Border Radius Generator FAQ

Can I use this tool to create a perfect circle?
Yes, selecting the circle preset or setting all four corners to the same percentage value (typically 50% on a square element) will produce a perfect circle.
Does the generated CSS work in all browsers?
The border-radius property is widely supported across modern browsers, but very large values or unusual units may render differently depending on the element's dimensions.
Is it possible to link the corner values so they move together?
The interface includes a link icon that, when toggled, synchronizes the corner sliders so that adjusting one corner updates all others simultaneously.
Are the presets responsive to different element sizes?
Presets apply fixed radius values; for responsive designs, it is recommended to adjust the corners manually using percentage or em units that scale with the element's dimensions.
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