Best Free Online Developer Tools to Use in 2026
A practical, opinionated list of the best free online developer tools worth using in 2026, organized by category so you can find what you need fast.
Aug 08, 2026
CSS Blob Shape Generator
Generate organic blob shapes using CSS border-radius with customizable control points and animation.
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What is a CSS Blob Shape?
A CSS blob is an organic, fluid shape created using multiple border-radius values. Unlike perfect circles or rounded rectangles, blob shapes have irregular, flowing contours that mimic natural forms found in cells, clouds, and abstract art.
The technique uses the CSS property border-radius with up to 8 values (4 horizontal, 4 vertical), allowing each corner to have a different curvature. Combined with gradients and rotation animation, blobs create eye-catching visual elements for backgrounds, hero sections, and decorative UI components.
How to Use
- Adjust the shape — Use the 8 border-radius sliders (TL, TR, BR, BL × horizontal/vertical) to mold the blob.
- Randomize — Click "Randomize Shape" for instant organic shapes.
- Choose colors — Pick a solid color or enable gradient mode with two colors.
- Add animation — Enable animation to make the blob rotate slowly for a fluid, living effect.
- Copy the CSS — Click "Copy CSS" to copy the generated code to your clipboard.
Frequently Asked Questions
How does the border-radius blob technique work?
By providing 8 values to border-radius (4 horizontal, 4 vertical separated by /), each corner can have a unique elliptical curve, creating organic, asymmetrical shapes.
Can I use blob shapes as backgrounds?
Yes. Blob shapes make excellent decorative backgrounds. Use position: absolute with lower opacity for subtle background blobs.
Why choose blob shapes over circles?
Blob shapes feel more natural and organic than perfect geometric shapes. They add visual interest, reduce rigidity in designs, and work well in modern, fluid UI aesthetics.
Can I use blobs in SVG format?
This generator produces CSS blob shapes. To export as SVG, use an online converter to trace the CSS shape, or recreate it using SVG path commands with similar bezier curves.
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