CSS Border Radius Generator

Design smooth organic blobs, fluid asymmetric card containers, and morphing CSS keyframe animations with interactive 8-point border-radius controls.

At a glance

CSS Border Radius Generator is a free browser tool that generates organic 8-point CSS border radius shapes and fluid blob animations online. Full mathematical support for 4-edge linked handles and independent 8-coordinate CSS border-radius syntax. Everything runs locally in your browser — nothing is uploaded and no sign-up is needed.

Developer Suite: CSS Border Radius CSS Triangle CSS Clip Path Glassmorphism CSS Box Shadow CSS Gradient Color Palette

100% Client-Side 8-Point Fancy Border Radius Studio

Create fluid organic blob shapes, asymmetric UI containers, and CSS @keyframes morphing animations in real time. Zero server requests.

Live Morphing Pure CSS & Tailwind
Color:
Organic Blob
Shape Geometry Inspector 1:1 Aspect Ratio (320px × 320px)
Top Edge 60% • 40%
Right Edge 30% • 70%
Bottom Edge 30% • 70%
Left Edge 40% • 60%
Mode:
60%
30%
30%
40%
Width: 320px
Height: 320px
Shape Presets 
border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
Standard CSS Declaration

Why Use This CSS Border Radius Generator?

8-Point Fancy Border Radius: Full mathematical support for 4-edge linked handles and independent 8-coordinate CSS border-radius syntax.
Live Morphing Animations: Generate smooth @keyframes blob morphing animations between complementary geometric keyframes with duration controls.
Presets Catalog: 8 instant architectural presets including Organic Blob, Smooth Pebble, Fluid Droplet, Leaf / Lemon, Asymmetric Card, Egg / Oval, Chat Bubble, and Flowing Shield.
Polyglot Code Exporters: Copy standard CSS declarations, Tailwind CSS arbitrary rounded classes (rounded-[...]), CSS custom properties, or keyframe animations.
Interactive Geometry Inspector: Real-time display of edge horizontal/vertical percentages, aspect ratio calculator, and box dimension sliders.
100% Client-Side Privacy: All border-radius calculations and preview rendering execute locally in your web browser. Zero tracking or telemetry.

How to Use CSS Border Radius Generator

1

Adjust Shape Handles or Load a Preset

Drag the top, right, bottom, and left edge sliders to shape your organic blob, or click any chip in the presets grid.

2

Customize Dimensions and Animation

Adjust width and height sliders, choose a color theme, and toggle 'Animate Morph' to preview smooth continuous animation.

3

Copy CSS or Tailwind Code

Select your desired code format tab (CSS, Tailwind, @keyframes, or Variables) and click 'Copy' or download the .css file.

Worked example: Organic Blob Handles to 8-Point Radius CSS

The engine normalizes 8 horizontal and vertical values into a radius string and emits the declaration plus morph keyframes.

Blob Handles Source 
preset: Organic Blob - values [60, 40, 30, 70, 60, 30, 70, 40]
Generated CSS Declaration Processed 
border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;

Technical Specifications & Engine Details

Technical specifications and engine details for CSS Border Radius Generator
Specification Details
Supported Formats GUI, SLIDERS, CSS → CSS, TAILWIND, TEXT
Execution Mode 100% Client-Side In-Browser (client)
Browser Requirements Requires modern web browser with ECMAScript 6+ and standard DOM Web APIs.
Performance Constraints Client browser memory limit (typically 1–2 GB RAM); processing speed depends on local device CPU.
Maintained by Pragyan Pahadi

100% Client-Side Privacy Guarantee

All border-radius calculations, preview rendering, and code generation run 100% locally in your web browser. Zero design data is sent to external servers.

Frequently Asked Questions

What is an 8-point fancy border-radius in CSS?
In CSS, border-radius can accept eight values separated by a slash: border-radius: H1 H2 H3 H4 / V1 V2 V3 V4. The values before the slash define horizontal radii, while the values after define vertical radii, allowing elements to take on smooth, organic blob and pebble shapes.
How does the 4-handle linked mode work?
Linked mode places one handle on each bounding box edge (top, right, bottom, left). Adjusting an edge handle automatically computes complementary radii (e.g., top handle at 60% yields 60% on the top-left and 40% on the top-right), ensuring continuous convex curvature without sharp corners.
Can I use these shapes in Tailwind CSS?
Yes. The Tailwind export tab outputs arbitrary rounded classes formatted like rounded-[60%_40%_30%_70%/60%_30%_70%_40%], which you can paste directly into your Tailwind markup.
How do morphing blob animations work?
The @keyframes tab generates a CSS keyframe animation that smoothly interpolates between your chosen shape and rotated/inverted complementary shapes at 33% and 66%, creating a perpetual fluid blob morphing effect with pure GPU-accelerated CSS.

Methodology

This tool runs entirely in your browser. The example above shows a representative input and the result it produces.

Last updated .

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