How do I make a perfect circle with border-radius?

Set border-radius to 50% on a square element (equal width and height). For a pill or capsule shape, set border-radius to a value equal to or greater than half the element's height on a rectangular element.

Is my data safe when using the Border Radius?

Yes. All computations, parsing, and transformations occur locally inside your browser via client-side JavaScript. No input data is sent to external servers.

Is the Border Radius completely free?

Yes. QuizOxa Tools is 100% free with no subscription, account creation, or rate limits required.

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Generator Client-Side

Free Online CSS Border Radius Generator

Design custom CSS border-radius values with individual control over each corner (top-left, top-right, bottom-right, bottom-left). Create perfect circles, pill shapes, organic blob-like forms, and asymmetric shapes with the advanced 8-value syntax for elliptical corners. See your shape in real-time on a visual preview and copy the optimized CSS code instantly. Essential for modern UI design with rounded components and creative shapes.

100% In-Browser Privacy Instant Zero-Lag Execution Zero Data Uploaded

Link all corners (simple mode)

Border Radius30%

Shape Preview

CSS Output

border-radius: 30%;

How to Use Border Radius

Input Your Data

Paste or type your input into the workspace above, or upload a target file directly.

Configure Settings

Select desired formatting options, conversion rules, or target units suited for your project.

Instant Processing

Execution completes in milliseconds right inside your browser memory with zero network latency.

Export & Copy

Use one-click copy to move the processed output to your clipboard or download files locally.

Key Highlights & Privacy Guarantee

Zero Server Storage

Your data is processed strictly in client-side RAM using WebAssembly and standard JavaScript APIs. No data packets or credentials are sent to our backend.

High-Speed Execution

By removing server round-trips, transformations occur in under a millisecond, optimizing Core Web Vitals and eliminating processing queues.

Free with Zero Limits

No subscription tiers, no hidden credit systems, and no registration walls. Run unlimited conversions and utilities whenever needed.

In-Depth Developer Guides

18 min read•Generator

Mastering CSS Border Radius: 8-Value Syntax, Nested Curves & Squircle Guide (2027)

Master CSS border-radius syntax, 8-point elliptical curves, concentric nested corners math, iOS squircles, organic blob shapes, and free visual generator.

Read Full Guide

Frequently Asked Questions

The shorthand 'border-radius: TL TR BR BL / TL TR BR BL' sets horizontal radii before the slash and vertical radii after. This creates elliptical corners for organic, blob-like shapes instead of simple circular corners.