CSS Border Radius Generator
Design, customize, preview, and export modern CSS border-radius values with four independent corner controls, elliptical slash syntax, live interactive drag handles, preset galleries, Tailwind classes, SCSS, JSON export, and shareable URLs.
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What is a CSS Border Radius Generator?
Overview and core technical concepts
A CSS Border Radius Generator is a visual layout tool for crafting smooth rounded corners, pill buttons, avatar circles, and organic 8-value asymmetrical blob shapes using the CSS `border-radius` property.
Why Use Visual Border Radius Generators?
Key advantages, developer speedups, and security benefits
Craft Organic Fluid Shapes
Visualizing 8-value elliptical syntax (`border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%`) is nearly impossible in code without real-time visual feedback.
Speed Up Design Prototyping
Instantly copy Tailwind CSS arbitrary values or pure CSS rules for buttons, cards, and modal dialogs.
When Shouldn't You Use Complex Border Radiuses?
Anti-patterns, limitations, and when to choose an alternative approach
Excessive corner rounding on dense data grids creates visual distractions and wastes row space.
Asymmetrical Blob Code Snippet
Sample inputs, expected outputs, and code patterns
Organic Blob Radius
border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;Common Border Radius Mistakes
Frequent errors, security risks, and how to fix them
Frequently Asked Questions
The CSS border-radius property allows web developers to round the outer border corners of any HTML element. It can accept a single radius for all corners, four individual corner values, or separate horizontal and vertical radii to create elliptical shapes.
When specifying four values in CSS border-radius (e.g., border-radius: 40px 10px 50px 20px;), they are applied in clockwise order starting from the top-left: 1st value = Top-Left, 2nd value = Top-Right, 3rd value = Bottom-Right, 4th value = Bottom-Left.
An elliptical border radius defines different radii for the horizontal (X-axis) and vertical (Y-axis) curves of a corner. The values before the slash '/' set the horizontal radii, while values after the slash set the vertical radii (e.g., border-radius: 40px 10px 50px 20px / 20px 60px 10px 40px;).
To create a perfect circle, set border-radius to 50% on an element with equal width and height. To create a pill or capsule shape on rectangular buttons, set border-radius to 9999px or 50% height.
No. ToolZeno's CSS Border Radius Generator runs 100% client-side inside your browser using JavaScript. No design data, parameters, or color choices leave your local device.
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