SVG Blob Generator - Create Organic Blob Shapes Online
Create random organic SVG blob shapes for modern web design
Frequently Asked Questions
What is an SVG blob generator?
An SVG blob generator is a tool that creates random, organic-looking shapes (called "blobs") in SVG (Scalable Vector Graphics) format. These shapes are generated mathematically by distributing random points around a circle and connecting them with smooth curves. Blobs are widely used in modern web design for backgrounds, hero sections, card decorations, and branding elements because of their soft, organic appearance.
How do I use this SVG blob generator?
1. Adjust the Complexity slider to control how many curves the blob has (more = more complex shape). 2. Adjust the Randomness slider to control how organic/irregular the shape is (higher = wilder shape). 3. Set the Size for the SVG viewBox dimensions. 4. Choose a Fill Type (solid color or gradient) and pick your colors. 5. Click Randomize to generate different blob variations. 6. Copy the SVG code or download the SVG/PNG file when you find a shape you like.
Is my design data safe? Does it get sent to a server?
Your design data is 100% safe and never leaves your browser. All blob generation is performed client-side using JavaScript mathematical algorithms. No data is transmitted to any server. This makes the tool safe for proprietary brand work and confidential design projects.
What is the difference between complexity and randomness?
Complexity controls the number of control points used to generate the blob. More points create shapes with more curves and detail, while fewer points create simpler, rounder shapes. Randomness controls how far each point deviates from a perfect circle. Low randomness produces nearly circular shapes, while high randomness creates wild, irregular organic forms.
Can I use the generated SVG in my web project?
Yes, the generated SVG code can be used directly in any web project. You can embed it inline in HTML, use it as a React/Vue component, reference it as an external SVG file, or use it as a CSS background-image via data URI. The SVG is standards-compliant and works in all modern browsers.
What are common use cases for SVG blobs in web design?
SVG blobs are commonly used for: hero section backgrounds, card and container decorations, image masks and clip paths, loading/placeholder animations, logo and branding elements, section dividers, floating decorative elements, and gradient backgrounds. Their organic shape adds visual interest and a modern feel to otherwise rectangular web layouts.
Why use SVG format instead of PNG or JPEG for blobs?
SVG (Scalable Vector Graphics) offers several advantages: infinite scalability without quality loss, tiny file sizes compared to raster images, easy color customization via code, animation support with CSS/JS, transparent backgrounds by default, and SEO-friendly since SVG is text-based markup. SVG blobs remain crisp on any screen size or resolution.
Code Examples
// Generate an organic SVG blob shape in JavaScript
// Seeded random number generator (Mulberry32)
function createSeededRandom(seed) {
return function () {
seed |= 0;
seed = (seed + 0x6d2b79f5) | 0;
let t = Math.imul(seed ^ (seed >>> 15), 1 | seed);
t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t;
return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
};
}
// Generate blob points using polar coordinates with random deviation
function generateBlobPoints(numPoints, radius, randomness, seed) {
const rng = createSeededRandom(seed);
const points = [];
const angleStep = (Math.PI * 2) / numPoints;
for (let i = 0; i < numPoints; i++) {
const theta = i * angleStep;
const deviation = 1 + (rng() - 0.5) * (randomness / 50);
const r = radius * deviation;
points.push({
x: Math.cos(theta) * r,
y: Math.sin(theta) * r,
});
}
return points;
}
// Convert points to smooth SVG path using Catmull-Rom spline
function pointsToSvgPath(points, center) {
const n = points.length;
let d = `M ${points[0].x + center} ${points[0].y + center}`;
for (let i = 0; i < n; i++) {
const p0 = points[(i - 1 + n) % n];
const p1 = points[i];
const p2 = points[(i + 1) % n];
const p3 = points[(i + 2) % n];
const cp1x = p1.x + (p2.x - p0.x) / 6;
const cp1y = p1.y + (p2.y - p0.y) / 6;
const cp2x = p2.x - (p3.x - p1.x) / 6;
const cp2y = p2.y - (p3.y - p1.y) / 6;
d += ` C ${cp1x + center} ${cp1y + center}, ${cp2x + center} ${cp2y + center}, ${p2.x + center} ${p2.y + center}`;
}
return d + " Z";
}
// Generate complete SVG string
function generateBlobSvg(options = {}) {
const {
seed = Math.floor(Math.random() * 100000),
complexity = 8,
randomness = 50,
size = 400,
color = "#6366f1",
} = options;
const center = size / 2;
const radius = size * 0.35;
const points = generateBlobPoints(complexity, radius, randomness, seed);
const path = pointsToSvgPath(points, center);
return `<svg viewBox="0 0 ${size} ${size}" xmlns="http://www.w3.org/2000/svg">
<path d="${path}" fill="${color}" />
</svg>`;
}
// Usage
const svg = generateBlobSvg({
seed: 42,
complexity: 10,
randomness: 60,
size: 400,
color: "#8b5cf6",
});
console.log(svg);
document.getElementById("blob-container").innerHTML = svg;