CSS Border Radius Generator
Design highly customized CSS border radiuses visually. Drag sliders to adjust standard circular curves or construct advanced asymmetrical 8-point organic blob shapes. Instantly export copy-pasteable CSS codes.
Horizontal Radii (%)
Vertical Radii (%)
Visual Simulator
CSS Style Syntax
Deep Dive into CSS border-radius Rules
The border-radius property in CSS is a powerful tool used to round the corners of element outer border edges. While most developers utilize it for basic, uniform rounding (e.g. border-radius: 8px or border-radius: 50%), CSS supports specifying up to eight separate values to create intricate shapes, such as fluid, asymmetrical organic blobs, modern typography frames, and botanical leaf structures.
How to Use the Visual Corner Designer
- Adjust Horizontal Curves: Move the top four sliders to control where the corner curve starts along the horizontal X-axis for all four corners.
- Adjust Vertical Curves: Move the bottom four sliders to modify where the curve starts along the vertical Y-axis for each corner.
- Simulate Custom Shapes: Watch the central colorful preview element morph instantly to match your inputs. Click on preset badges to see standard shapes like capsules, perfect circles, and organic blobs.
- Copy and Inject: Simply copy the generated
border-radiusstyling string from the export card and drop it directly into your stylesheet or inline styles.
Understanding the 8-Point Slash Syntax
When eight parameters are specified, the values before the slash (/) define the horizontal radii, whereas the values after the slash define the vertical radii.
border-radius: [TL_H] [TR_H] [BR_H] [BL_H] / [TL_V] [TR_V] [BR_V] [BL_V];
For instance, border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%; generates a fluid organic pebble-like shape. The top-left corner has a horizontal radius of 30% and a vertical radius of 30%, whereas the top-right corner stretches 70% horizontally but only 30% vertically.
Benefits of Visual Styling Playgrounds
- Zero Trial and Error: Visualizes corner geometry immediately without forcing you to continuously reload layouts in browser inspectors or IDEs.
- No External Bloat: Design complex shapes with native CSS instead of wrapping components in heavy vectors or transparent background PNG assets. This maintains outstanding Core Web Vitals.
- Mobile Accessibility: Sliders are fully touch-friendly, allowing you to design beautiful assets on smartphones and tablets.
Frequently Asked Questions
What is a fancy 8-point CSS border-radius?
The CSS border-radius property allows you to specify up to eight separate values. By dividing values with a slash (/), you can separate horizontal and vertical radii (e.g. 30% 70% 70% 30% / 30% 30% 70% 70%). This creates organic, asymmetrical "blob" shapes that are highly popular in modern UI design.
How do horizontal and vertical radii differ in CSS?
Standard corners are drawn using a single radius, creating a perfect circular curve. When you specify both horizontal and vertical radii, the curve becomes elliptical, letting you stretch the corner along either the X or Y axis independently.
Is this corner designer responsive?
Yes! Using percentage (%) values instead of pixels (px) ensures that the custom shapes scale proportionally as the parent container resizes across different mobile, tablet, and desktop viewports.
Will these custom shapes work on all major browsers?
Absolutely. The standard border-radius property is natively supported across all modern web browsers (Chrome, Safari, Firefox, Edge, Opera) with 100% compatibility, making vendor prefixes unnecessary.