Free Online CSS Blob Shape Generator Tool
Generate CSS blob shapes online instantly with this free CSS Blob Shape Generator. Use the tool below to create organic shapes, abstract blobs, decorative backgrounds, soft UI shapes and custom CSS border-radius code for your website or design project.
CSS blob shape settings
Create organic CSS blob shapes using advanced border-radius values, gradients, rotation and shadows.
Shape controls
The first four values control the horizontal radius. The values after the slash control the vertical radius.
Live preview
Preview your blob as a decorative shape, avatar, badge or background element.
Generated CSS
58% 42% 68% 32% / 42% 58% 36% 64%Saved blobs
Recent and favorite blob shapes are saved locally in this browser.
Recent blobs
Favorite blobs
What is a CSS Blob Shape Generator?
A CSS Blob Shape Generator is an online tool that helps you create organic blob shapes with CSS. Instead of writing complex border-radius values manually, you can adjust the shape visually, preview the result and copy the generated CSS code.
Blob shapes are irregular, soft and organic shapes often used in modern web design. They can be used as decorative backgrounds, hero section graphics, image masks, cards, badges, illustrations, landing page accents and creative UI elements.
This CSS Blob Shape Generator runs directly in your browser, making it fast and simple to create abstract blob CSS without installing software.
What can you use it for?
You can use this online blob shape generator to create decorative website shapes, abstract backgrounds, organic UI elements, hero graphics, profile image masks, feature section accents, landing page blobs, gradient blobs, soft cards and modern visual decorations.
For example, you may want a soft blob behind a product image, an abstract shape in a hero section, a gradient blob for a landing page, an organic mask for an image, or a decorative background shape for a modern UI section.
How to use the CSS Blob Shape Generator
Step 1: Adjust the blob shape
Use the controls to change the blob shape, corner values, size, radius and organic proportions.
Step 2: Preview the organic shape
Check the live preview to see how the blob looks. Adjust the values until the shape matches your design.
Step 3: Copy the CSS code
Copy the generated CSS blob code and paste it into your stylesheet, component, page builder, theme or frontend project.
CSS blob shape options
This CSS Blob Shape Generator can help with common shape design tasks such as:
- Generate CSS blob shapes
- Create organic CSS shapes
- Create abstract blob shapes
- Generate custom border-radius values
- Create decorative background blobs
- Create gradient blob shapes
- Create soft UI shapes
- Create hero section blobs
- Create image mask-style shapes
- Create landing page decorations
- Create irregular rounded shapes
- Preview blob shapes live
- Generate clean CSS code
- Copy blob CSS instantly
- Create modern website graphics
- Create abstract UI accents
- Use the tool without installing software
The final CSS output may depend on the shape values, element size, background style, border radius and how the generated code is applied in your project.
What is a CSS blob shape?
A CSS blob shape is an irregular rounded shape created with CSS. It usually looks soft, organic and abstract instead of perfectly circular or rectangular.
Many blob shapes are created with advanced border-radius values. By setting different radius percentages for each side and corner, you can create a fluid, organic form using only CSS.
Blob shapes are popular in modern web design because they add personality and visual movement without needing complex illustrations.
Basic CSS blob example
A simple CSS blob shape can be created with border-radius.
.blob {
width: 280px;
height: 280px;
background: #8b5cf6;
border-radius: 62% 38% 45% 55% / 48% 56% 44% 52%;
}The first group of percentage values controls the horizontal radius values. The second group, after the slash, controls the vertical radius values.
Gradient blob example
Blob shapes often work well with gradients.
.blob-gradient {
width: 320px;
height: 320px;
background: linear-gradient(135deg, #6366f1, #ec4899);
border-radius: 60% 40% 35% 65% / 55% 35% 65% 45%;
}This type of shape can be used in hero sections, landing pages, banners, app previews and creative website backgrounds.
CSS blob with shadow
A soft shadow can add depth to a blob shape.
.blob-shadow {
width: 300px;
height: 300px;
background: #22c55e;
border-radius: 55% 45% 60% 40% / 45% 60% 40% 55%;
box-shadow: 0 24px 70px rgba(34, 197, 94, 0.35);
}This works well when the blob is used as a decorative background element behind text, images or cards.
CSS blob with image
You can also use a blob shape as an image container.
.blob-image {
width: 320px;
height: 320px;
overflow: hidden;
border-radius: 58% 42% 47% 53% / 48% 52% 48% 52%;
}
.blob-image img {
width: 100%;
height: 100%;
object-fit: cover;
}This can create organic profile pictures, team photos, portfolio images, product visuals or editorial design elements.
How CSS blob border-radius works
CSS border-radius can use multiple values to create more complex rounded shapes.
A normal rounded box may use one value:
border-radius: 24px;A circle often uses 50%:
border-radius: 50%;A blob shape uses different horizontal and vertical percentage values:
border-radius: 62% 38% 45% 55% / 48% 56% 44% 52%;This creates an irregular organic shape while keeping the element fully controlled with CSS.
Blob shapes vs normal border radius
Normal border radius
A normal border radius creates consistent rounded corners. It is useful for buttons, cards, inputs, modals and clean UI components.
Blob border radius
A blob border radius creates an irregular organic shape. It is useful for decorative design, abstract backgrounds, image masks, hero graphics and creative visual accents.
Use normal radius when you need clean UI structure. Use blob shapes when you want a softer, more expressive visual style.
Blob shapes vs SVG blobs
CSS blob shapes
CSS blob shapes are created with CSS properties such as border-radius, background, box-shadow and sometimes transform. They are easy to edit directly in your stylesheet.
SVG blobs
SVG blobs are vector shapes that can be more precise and flexible for complex illustrations. They are useful when you need scalable artwork or exported graphics.
For many website decorations, CSS blob shapes are simple, lightweight and easy to customize.
Common CSS blob use cases
For hero sections
Place a blob behind a headline, product image, app screenshot or call-to-action area to make the hero section feel more dynamic.
For decorative backgrounds
Use soft blob shapes as background accents behind cards, sections, images or layout blocks.
For image masks
Wrap images in organic blob shapes for profile photos, portfolio visuals, team sections and editorial layouts.
For landing pages
Add abstract blobs to SaaS pages, startup websites, portfolios, agency pages and creative landing pages.
For cards and sections
Use blob shapes as decorative corners, background highlights, floating elements or soft visual separators.
For gradients and glows
Combine blobs with gradients, opacity and blur to create colorful glow effects or modern abstract backgrounds.
Animated blob shape example
You can animate a blob shape by changing the border-radius over time.
.animated-blob {
width: 300px;
height: 300px;
background: linear-gradient(135deg, #06b6d4, #8b5cf6);
animation: blobMorph 8s ease-in-out infinite;
}
@keyframes blobMorph {
0%, 100% {
border-radius: 60% 40% 35% 65% / 45% 55% 45% 55%;
}
50% {
border-radius: 40% 60% 65% 35% / 60% 40% 60% 40%;
}
}Animated blobs can add subtle motion to hero sections, backgrounds and decorative UI elements. Keep the motion slow and soft so it does not distract from the content.
Blurred background blob example
A blurred blob can create a soft glow effect.
.blob-glow {
width: 360px;
height: 360px;
background: #ec4899;
border-radius: 58% 42% 62% 38% / 45% 60% 40% 55%;
filter: blur(48px);
opacity: 0.55;
}This works well for abstract backgrounds, modern gradients, dark mode sections and glassmorphism-style designs.
Blob shape design tips
Use soft colors
Blob shapes often work best with soft colors, gradients or transparent backgrounds.
Keep blobs decorative
Blob shapes are usually decorative. Avoid placing important text inside a very irregular shape unless readability stays strong.
Combine with gradients
Gradients can make blob shapes feel more dynamic and modern.
Use opacity for subtle effects
Lower opacity can help blobs blend into the design without overpowering the content.
Add blur for glow effects
Blurred blobs can create soft background glows, especially on dark or gradient backgrounds.
Test on mobile
Large blobs may need different sizes or positions on mobile screens so they do not cover important content.
Keep performance in mind
Simple CSS blobs are usually lightweight, but large blurred elements and animated filters should be tested on real devices.
CSS properties used for blob shapes
width and height
The element size controls the base shape of the blob.
width: 300px;
height: 300px;background
The background property controls the blob color or gradient.
background: linear-gradient(135deg, #6366f1, #ec4899);border-radius
The border-radius property creates the organic shape.
border-radius: 60% 40% 35% 65% / 55% 35% 65% 45%;box-shadow
The box-shadow property can add depth.
box-shadow: 0 24px 70px rgba(0, 0, 0, 0.2);filter
The filter property can create blur or glow effects.
filter: blur(40px);transform
The transform property can rotate, scale or position the blob visually.
transform: rotate(-8deg) scale(1.05);Why use a CSS Blob Shape Generator?
A visual CSS Blob Shape Generator helps you create organic shapes faster. Instead of manually testing complex border-radius values, you can adjust the blob visually, preview the result and copy the CSS when it looks right.
This is useful for designers, developers, students, frontend builders, WordPress users, Elementor users and anyone creating modern website designs.
It can also help you keep a consistent visual style across hero sections, backgrounds, image masks, landing pages, UI cards and decorative design elements.
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Frequently Asked Questions
Is this CSS Blob Shape Generator free?
Yes. This CSS Blob Shape Generator is completely free to use.
Do I need to install anything?
No. You can generate CSS blob shapes directly in your browser without installing software.
What is a CSS blob shape?
A CSS blob shape is an irregular rounded shape created with CSS, usually using custom border-radius values.
Can I create organic shapes with CSS?
Yes. You can create organic shapes with CSS by using advanced percentage-based border-radius values.
Can I use gradients on blob shapes?
Yes. Blob shapes work well with solid colors, gradients, transparent backgrounds and glow effects.
Can I use a blob shape as an image mask?
Yes. You can place an image inside a blob-shaped container using overflow: hidden and custom border-radius.
Can I animate a CSS blob?
Yes. You can animate blob shapes by changing border-radius, transform, opacity or other CSS properties over time.
Can I copy the generated CSS?
Yes. After creating your blob shape, you can copy the generated CSS code and use it in your project.
Can I use this with WordPress or Elementor?
Yes. You can copy the generated CSS and use it in WordPress, Elementor, custom CSS fields, blocks, themes or frontend projects.
What CSS property creates blob shapes?
The main property is usually border-radius, often combined with background, box-shadow, filter and transform.
Are CSS blobs better than SVG blobs?
CSS blobs are simple and easy to edit in stylesheets. SVG blobs can be better for precise vector artwork or exported graphics.
Do CSS blobs affect performance?
Simple CSS blobs are usually lightweight. Large blurred blobs or animated effects should be tested on real devices, especially on mobile.
Can I use blob shapes for backgrounds?
Yes. Blob shapes are commonly used as decorative background elements, abstract accents and modern landing page graphics.
Can I create random blob shapes?
Yes. A blob generator can help you create different irregular shapes by changing the border-radius values.
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