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Border Radius Generator

Generate CSS border-radius with live preview. Create perfectly rounded corners, pill shapes, or custom border radius values for your web designs with real-time visual feedback.

Built & Maintained by the devtoolspack Team

Last updated: March 2026

Border Radius Controls

Live Preview

CSS Code

Presets
Precision Geometry with Our CSS Border Radius Generator
In modern UI design, the subtle application of rounded corners is essential for creating a "friendly" and premium aesthetic. Our CSS Border Radius Generator is a visual engineering utility designed to help developers and designers craft the perfect container geometry. Whether you need standard Material Design card curves, modern pill-shaped buttons, or complex asymmetric organic shapes, our tool provides the granular control required for pixel-perfect results.
By providing a real-time reactive preview, we eliminate the need for manual browser refreshes or guesswork, streamlining your frontend CSS workflow.
Understanding the Shorthand Syntax
Our tool intelligently chooses between shorthand and longhand CSS syntax based on your configuration:
  • Uniform Radius: Single-value syntax (e.g., 16px) for perfect symmetry across all vertices.
  • Individual Corner Control: 4-value syntax (Top-Left, Top-Right, Bottom-Right, Bottom-Left) for advanced UI patterns.
  • Geometric Presets: Instant configurations for Avatar Circles, Sidebar Tabs, and Interactive Cards.
  • Constraint Locking: Sync all four sliders to maintain aspect consistency while experimenting with depth.
Privacy-First Design Workflow
At devtoolspack, your design system integrity is private. This generator is a purely client-side utility. No parameters, hex codes, or layout configurations are transmitted to our servers. The CSS generation logic and visual rendering happen entirely within your browser's local sandbox, ensuring high-speed interactions and complete confidentiality for your proprietary design projects.
Frequently Asked Questions
What is the CSS border-radius property?
The border-radius property in CSS allows you to create rounded corners on elements. You can specify a single value for uniform rounding, or individual values for each corner (top-left, top-right, bottom-right, bottom-left). Values can be in pixels, percentages, or other CSS units.
What is the difference between shorthand and longhand border-radius?
Shorthand border-radius uses one to four values: one value applies to all corners, two values apply to opposite corners, and four values specify each corner individually (top-left, top-right, bottom-right, bottom-left). Longhand uses separate properties like border-top-left-radius for each corner.
How do I create a perfect circle with border-radius?
To create a perfect circle, set border-radius to 50% on a square element (equal width and height). For a pill shape on rectangular elements, use 50% or a large pixel value that equals or exceeds half the height of the element.
Can I use different units for border-radius?
Yes, border-radius accepts various CSS units including pixels (px), percentages (%), em, rem, and more. Percentages are relative to the element's dimensions, while pixels provide absolute values. This tool uses pixels for precise control.
Why use the lock feature for border-radius?
The lock feature ensures all four corners maintain the same radius value, which is useful for creating uniform rounded corners. When locked, adjusting any slider will update all corners simultaneously, making it easy to create consistent, symmetrical designs.