Border Radius Generator — Visual CSS Border Radius Editor

Border Radius Generator is a free, browser-based tool that lets you visually create CSS border-radius values by dragging corners, adjusting sliders, or selecting presets. See the shape update in real time, copy the CSS with one click, and move on. No signup, no install—just open and start shaping.

The Problem

CSS border-radius looks simple until you need asymmetric corners. The shorthand syntax accepts up to eight values—four horizontal radii and four vertical radii separated by a slash—and the mental model breaks down fast:

border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;

What shape does that produce? Without a visual preview, you're guessing, refreshing, adjusting, and refreshing again. The feedback loop is slow, and the syntax is unintuitive for anything beyond uniform rounding.

Designers hand over mockups with organic, blob-like shapes. Translating those into eight numeric values by trial and error wastes time and produces frustration.

How It Works

1. Individual Corner Control

Each corner has its own control. Adjust the top-left, top-right, bottom-right, and bottom-left radii independently. The preview shape updates as you drag, so you see exactly what you're building—no guesswork.

For advanced shapes, toggle to eight-value mode to set horizontal and vertical radii separately for each corner. This is how you create organic blobs, pill shapes, and asymmetric cards that go beyond simple rounded rectangles.

2. Real-Time Visual Preview

A live preview panel shows the resulting shape as you adjust values. The shape updates instantly—no "apply" button, no page reload. You see the exact CSS output rendered in the browser, so what you see is what your users will see.

3. Presets

Not starting from scratch. Common shapes are available as presets—rounded rectangle, pill, circle, blob, and more. Click a preset to load its values, then fine-tune from there. This is the fastest path from "I need a shape" to "I have the CSS."

4. One-Click Copy

When the shape looks right, copy the CSS with a single click. The output includes the full border-radius declaration ready to paste into your stylesheet, component, or inline style.

Key Features

• Individual corner control — set each corner's radius independently
• Eight-value mode — separate horizontal and vertical radii for organic shapes
• Real-time preview — shape updates as you adjust values
• Shape presets — common shapes available instantly
• One-click CSS copy — production-ready output
• Fully client-side — no API calls, no data leaves your browser
• No signup required — start generating immediately
• Responsive design — works on desktop and mobile

Technical Implementation

Core Technologies

• Next.js with App Router
• TypeScript in strict mode
• TailwindCSS for styling
• Client-side rendering — zero external API dependencies

Architecture

• Interactive corner controls with real-time value binding
• CSS property generation from individual corner state
• Preset system with one-click application
• Clipboard API integration for copy functionality
• Responsive layout for desktop and mobile use

Use Cases

Card & Button Styling

Most UI components start with rounded corners. Use the generator to dial in the exact radius—subtle 4px rounding for professional cards, fully rounded pill shapes for buttons, or asymmetric corners for distinctive callout boxes.

Organic & Blob Shapes

Marketing pages and landing pages often need organic, blob-like shapes for backgrounds, hero sections, or decorative elements. The eight-value mode lets you create these without hand-coding the slash syntax.

Design-to-Code Translation

A designer hands you a mockup with custom rounded shapes. Instead of eyeballing values and iterating through browser refreshes, open the generator, match the shape visually, and copy the exact CSS.

Prototyping UI Components

When experimenting with component styles during prototyping, the generator lets you try different corner treatments quickly. Compare a fully rounded chip vs. a subtly rounded card vs. an asymmetric notification badge—all without touching your codebase.

Learning CSS Border Radius

The border-radius shorthand with its slash notation is one of CSS's less intuitive syntaxes. The visual editor makes the relationship between values and shapes tangible—adjust a value, see the shape change, understand the mapping.

Why Border Radius Generator?

vs. Manual CSS

• Visual feedback — see the shape as you build it, not after a refresh
• Eight-value syntax made easy — no memorizing the slash notation
• Faster iteration — drag and adjust instead of type, save, reload

vs. Other Generators

• Individual corner control — not just a single-value slider
• Preset library — start from common shapes instead of zero
• Clean output — production-ready CSS, not a learning exercise
• No ads or account walls — open, use, copy, done

vs. Design Tools (Figma, Sketch)

• Direct CSS output — no manual translation from design values
• Eight-value support — design tools typically only expose four-corner rounding
• Browser-native rendering — the preview matches what CSS will actually produce

Results

Border Radius Generator removes the friction from CSS border-radius:

• Zero guesswork — see the shape before writing any CSS
• Organic shapes accessible — eight-value syntax without the complexity
• Faster workflow — from idea to CSS in seconds, not minutes
• Exact output — copy and paste with confidence

Try it now: border-radius-generator.tools.jagodana.com