SVG blob shapes are smooth, organic, amoeba-like shapes used in modern web design for hero backgrounds, decorative elements, avatar frames, and section dividers. This generator creates random blobs with full control over shape complexity, colors, gradients, and stroke — then exports production-ready SVG code or a CSS background-image data URI.
Presets
Shape
Colors
Preview
SVG Code
CSS Background
How to Use the SVG Blob Generator
SVG blobs are one of the most versatile design elements in modern web design. They appear as hero section backgrounds, image masks, avatar frames, section dividers, and decorative accents. Unlike rectangular or circular shapes, blobs have organic, unpredictable curves that create visual interest without feeling geometric or rigid. This SVG blob generator creates smooth, customizable blob shapes instantly and exports them as ready-to-use SVG code or CSS.
Step 1: Choose a Preset or Start from Scratch
The quickest way to start is with a preset. Simple creates a minimal blob with 5 points and low randomness — ideal for subtle background shapes. Organic produces a natural-looking 8-point blob with medium randomness that works well for most use cases. Spiky adds high randomness for jagged, energetic shapes. Smooth reduces randomness to the minimum for gentle, flowing curves. Complex uses 12 points for more intricate outlines.
Step 2: Fine-Tune the Shape
Use the Points slider to control how many anchor points define the blob outline. More points create more complex, textured shapes. The Randomness slider controls how much each point is displaced from the baseline circle — 0% gives a perfect circle, 100% gives wild, irregular shapes. The Seed number determines the exact random pattern: the same seed always produces the same shape, so you can save a seed you like and reproduce it exactly.
Step 3: Customize Colors
Click the fill color swatch to choose a solid fill color for your blob. Toggle Gradient Fill to switch to a two-color linear gradient — set start and end colors for a richer visual effect. The gradient runs diagonally from top-left to bottom-right. Enable Add Stroke to add a colored border around the blob, useful for outlines or to create a "floating" visual effect with a stroke that contrasts the background.
Step 4: Export Your Blob
Click Copy SVG to copy the raw SVG markup to your clipboard. Paste it directly into your HTML or a design tool like Figma. Click Download to save it as a .svg file. For CSS backgrounds, click Copy CSS to get the blob as a background-image CSS rule using a data URI — paste this into your stylesheet for a no-file-needed background that scales perfectly at any size.
Common Use Cases
Hero backgrounds: Use a large, low-randomness blob as an off-screen decorative element behind your headline. Image masks: Use the SVG path as a CSS clip-path to give photos an organic border instead of a rectangle. Icon backgrounds: Use a small blob behind an icon instead of a square or circle card. Section dividers: Place a wavy blob at the transition between two sections to soften the boundary.
FAQ
Is this SVG blob generator completely free?
Yes, this SVG blob generator is 100% free with no usage limits. You can generate as many blob shapes as you want, export SVG code, and copy CSS without creating an account or paying anything. Everything runs in your browser.
Can I use the generated blobs in commercial projects?
Yes, all blob shapes generated by this tool are yours to use freely in any project — personal, commercial, or open-source. There are no licensing restrictions on shapes you create with this tool.
How does the blob generation algorithm work?
The algorithm places equally-spaced points around a circle and randomly perturbs each point's distance from the center based on the randomness setting. Adjacent points are then connected using smooth cubic bezier curves (splines) to create organic, rounded shapes.
What is the seed parameter used for?
The seed number controls the random values used to perturb each point. Using the same seed will always produce the same blob shape, making it perfect for reproducible designs. Change the seed to get a completely different shape while keeping all other settings the same.
How do I use a blob as a CSS background?
Click the 'Copy CSS' button to get the blob as a background-image data URI. You can paste this directly into a CSS rule like: .hero { background-image: url('data:image/svg+xml,...'); background-size: cover; }. This is great for hero sections, card backgrounds, and decorative elements.
Can I animate the blob shape?
This tool exports static SVG code. To animate a blob, export the SVG, then use CSS animations on the SVG path's d attribute with @keyframes, or use a JavaScript library like anime.js or GSAP to interpolate between two different blob paths.
What do the preset buttons do?
The presets (Simple, Complex, Organic, Spiky, Smooth) are shortcuts that set recommended combinations of point count and randomness. Simple gives a basic 5-point blob with low randomness; Spiky gives high randomness for jagged shapes; Smooth gives low randomness for gentle curves.