Free CSS Border-Radius Generator — Visual Corner Editor & Blob Shapes

CSS Border-Radius Generator: From Rounded Cards to Organic Blob Shapes

Most developers only ever use `border-radius` with a single value to round all four corners equally — but the property actually accepts up to four independent values, one per corner, which opens the door to much more interesting shapes than a plain rounded rectangle. A border-radius generator makes it easy to explore that space visually instead of guessing pixel values.

This guide explains how independent corner radii work and how to design organic shapes with them.

How Border-Radius Corners Work

The `border-radius` shorthand accepts values in this order: top-left, top-right, bottom-right, bottom-left. When all four values are equal, you get a standard rounded rectangle. When they differ, the shape becomes asymmetric.

How to Design a Shape Online (Step by Step)

Using the ToolzGo CSS Border-Radius Generator takes a few seconds:

• •Go to toolzgo.com/tools/developer-tools/border-radius-generator
• •Drag the sliders for top-left, top-right, bottom-right, and bottom-left independently
• •Watch the live preview box update as you adjust each corner
• •Try extreme, uneven values for organic blob shapes
• •Copy the generated `border-radius` shorthand into your stylesheet

Why Use Asymmetric Border-Radius?

Uniform rounded rectangles are everywhere in web design — asymmetric shapes stand out. Organic blob shapes are commonly used behind profile photos, as decorative background elements, or as a softer alternative to a plain rectangular image container. Because it's pure CSS, the shape scales cleanly at any resolution and requires no image assets or SVG.

Border-Radius and Elliptical Corners

Beyond four simple values, `border-radius` also supports a "/" syntax to set horizontal and vertical radii separately for each corner, enabling elliptical (rather than circular) corner curves. This is a more advanced technique, but it's what makes truly organic, hand-drawn-looking blob shapes possible in pure CSS.

Frequently Asked Questions

Q: Can border-radius create shapes other than rounded rectangles?

A: Yes — using different horizontal/vertical radius values on each corner (the CSS border-radius shorthand supports this) can produce organic "blob" and leaf-like shapes, not just uniform rounded corners.

Q: What is the CSS syntax for four different corner radii?

A: The border-radius shorthand accepts up to four values for top-left, top-right, bottom-right, and bottom-left, and optionally a "/" to set horizontal and vertical radii separately for elliptical corners.

Q: Does border-radius work on all elements?

A: Yes, border-radius applies to any element with a visible box, including divs, images, and buttons, and is supported in all modern browsers.

Q: Will an asymmetric border-radius work responsively?

A: Yes — since border-radius values are typically set in pixels or percentages, the shape will scale or stay fixed based on which unit you choose, same as any other CSS property.

Combine your shape with the ToolzGo Box-Shadow Generator for added depth, or fill it with a gradient using the CSS Gradient Generator.

Design your border-radius shape visually.