SVG Blob Generator
Generate random organic SVG blob shapes with adjustable complexity and color. Copy the SVG or download it — all in your browser.
Pure browser JavaScript — generates SVG paths locally.
How to use this tool
- Adjust complexity, irregularity, and color.
- Click Randomize for a new shape.
- Copy the SVG code or download the .svg file.
Generate random organic SVG blob shapes with adjustable complexity and color. Copy the SVG or download it — all in your browser.
How it works
The SVG Blob Generator creates smooth, organic blob shapes using randomized SVG path curves. Blobs are popular in modern web design as decorative backgrounds, image masks, and hero section accents.
Adjust the complexity slider to control how many anchor points define the blob's outline — fewer points give rounder, simpler shapes while more points create irregular, lumpy forms. The color picker sets the blob's fill, and you can regenerate as many times as you like until you find a shape you want.
The output is a self-contained SVG element with a viewBox and a single path. You can copy the SVG markup and embed it directly in HTML, use it as a CSS background-image via a data URL, or download it as an .svg file to open in Figma or Illustrator for further editing.
Because SVG is resolution-independent, the blob will look sharp at any screen size — from small icons to full-screen backgrounds — with no pixelation.
Worked example
Create a blob background for a hero section
- Set the complexity to a medium value (around 5-6 points) for a natural-looking shape.
- Pick your brand color using the color picker.
- Click Randomize a few times until the shape feels balanced.
- Click Copy SVG to copy the markup.
- Paste it inside your hero HTML element and position it with CSS (position: absolute, z-index: -1).
A colorful, organic blob shape sitting behind your hero content, adding depth without any image files.
Common mistakes to avoid
- Setting complexity too high (many anchor points) which produces a jagged, star-like shape rather than a smooth blob.
- Embedding the SVG as an img src without encoding it properly as a data URL — use encodeURIComponent() around the SVG markup when setting it as a CSS background-image.
- Forgetting to set the SVG's width and height or viewBox when using it as a standalone element, causing it to render at a default 300x150px.
Key terms
- SVG path
- A scalable vector graphic element that draws shapes using a sequence of commands for lines, arcs, and Bezier curves.
- Bezier curve
- A smooth curve defined by control points, used in SVG paths to create the flowing, organic edges of a blob shape.
Frequently asked questions
- How is the blob created?
- Points are placed around a circle at randomized radii, then joined with quadratic Bézier curves through their midpoints for a smooth organic outline.