Productive ToolboxCSS Border-Radius Blob Maker
Create organic, non-round shapes
Quick Actions
Preset Blobs
Horizontal Radius
Vertical Radius
Preview Settings
Live Preview
Border Radius
border-radius: 60% 40% 30% 70% / 50% 30% 70% 40%;
What is a CSS Blob Generator?
A CSS blob generator creates organic, irregular shapes using the border-radius property with 8 different values. These modern, fluid shapes are perfect for hero sections, background decorations, and contemporary web design. Unlike simple rounded corners, blob shapes use complex border-radius syntax to create unique, eye-catching visuals.
How CSS Blob Shapes Work
CSS blob shapes use the advanced border-radius syntax with 8 values: 4 for horizontal radii and 4 for vertical radii.
Border-Radius Syntax
border-radius: TL TR BR BL / TL TR BR BL;
First 4 values = Horizontal radii (top-left, top-right, bottom-right, bottom-left)
Last 4 values = Vertical radii (same order)
Example
border-radius: 60% 40% 30% 70% / 50% 30% 70% 40%;
This creates an organic blob shape with varying curvature at each corner.
Key Features
🎨 Live Preview
See your blob shape update in real-time as you adjust sliders.
🎲 Random Generator
Generate unique blob shapes with one click.
🎬 Animation Creator
Generate CSS keyframes for morphing blob animations.
📦 Preset Library
6 pre-designed blob shapes for quick starts.
🎨 Background Options
Choose from gradients, solid colors, or transparent.
💾 Export Options
Download as SVG, CSS, or JSON format.
Common Use Cases
🎯 Hero Sections
Add organic blob shapes as background elements in hero sections for modern, eye-catching designs.
🎨 Background Decorations
Use animated blobs as decorative elements to add visual interest without overwhelming content.
🖼️ Image Masks
Apply blob shapes as clip-path or mask for unique image presentations.
💼 Landing Pages
Create distinctive landing page designs with organic shapes that stand out.
🎭 Brand Identity
Design unique brand elements and visual identities using custom blob shapes.
Implementation Examples
Basic Blob
.blob {
width: 400px;
height: 400px;
background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
border-radius: 60% 40% 30% 70% / 50% 30% 70% 40%;
}Animated Blob
@keyframes blob-morph {
0%, 100% {
border-radius: 60% 40% 30% 70% / 50% 30% 70% 40%;
}
50% {
border-radius: 40% 60% 70% 30% / 70% 50% 40% 60%;
}
}
.blob {
animation: blob-morph 8s ease-in-out infinite;
}Responsive Blob
.blob {
aspect-ratio: 1;
width: min(40vw, 400px);
background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
border-radius: 60% 40% 30% 70% / 50% 30% 70% 40%;
}Design Tips
Use subtle animations: Keep animation duration between 6-10 seconds for smooth, calming effects.
Layer multiple blobs: Stack blobs with different sizes and opacities for depth.
Match brand colors: Use gradients that align with your brand palette.
Consider performance: Limit animated blobs to 2-3 per page for optimal performance.
Test responsiveness: Ensure blobs scale properly on mobile devices.
Frequently Asked Questions
What browsers support complex border-radius?
All modern browsers support the 8-value border-radius syntax (Chrome, Firefox, Safari, Edge). It's been supported since 2011.
Can I use blob shapes for images?
Yes! Apply the border-radius to an img element or use it as a clip-path. You can also use the SVG export as a mask for more complex effects.
Do animated blobs affect performance?
CSS animations are GPU-accelerated and generally performant. However, limit to 2-3 animated blobs per page and avoid animating on mobile for best performance.
How do I make blobs responsive?
Use relative units like vw, vh, or percentage widths. The responsive CSS output uses min() function to cap maximum size while allowing scaling.
Can I export blobs as images?
You can export as SVG, which is a vector format. To convert to PNG/JPG, open the SVG in a graphics editor or use an online SVG-to-PNG converter.
This CSS blob generator is a free, browser-based tool for designers and developers. All generation and exports happen locally with no server communication.