SVG Blob Generator
An SVG blob generator makes the soft, organic shapes used behind hero sections and cards in modern web design. Adjust how many points the blob has, how irregular it is and its colour, and it draws a smooth closed curve you can copy as SVG code or download, scalable to any size with no loss.
Last reviewed by the Radiatus Cloud team
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How the shape is made
The generator places a number of points evenly around a circle, then pushes each in or out by a random amount, more randomness gives a more irregular blob, and connects them with smooth quadratic curves so the outline flows rather than showing corners. Complexity controls the number of points: fewer points make a simple, rounded shape; more points make a busier, wavier one. A new random seed each time means you can generate variations until one fits.
Why SVG for this
A blob is a single path, so as SVG it is a few hundred bytes that scale to any size perfectly, unlike a PNG that is fixed-resolution and far larger. You can recolour it with a fill attribute, animate it with CSS, or drop it inline into HTML with no extra request. For decorative background shapes, vector is the right format, and this outputs clean, minimal path data.
Using the output
- Copy the SVG and paste it inline into your HTML to style and animate it with CSS.
- Download the file to use as an image, a mask, or a background.
- As a data URI, convert it (the SVG to data URI tool does this) to embed it in a CSS background with no separate file.
Design notes
Blobs read as friendly and informal, which suits marketing pages, illustrations and empty states, and less so dense data interfaces. Keep them low-contrast behind content so text stays readable, use one or two per view rather than many, and reuse a couple of shapes across a site for consistency rather than a different random blob on every page.
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Frequently Asked Questions
What controls the blob's shape?
Complexity sets how many points go around the circle, and randomness sets how far each point is pushed from a perfect circle. Low complexity and low randomness give a soft rounded shape; high values give a busy, irregular one.
Why use SVG instead of a PNG?
A blob is one vector path, so the SVG is tiny and scales to any size without blurring, and you can recolour or animate it with CSS. A PNG is fixed-resolution, larger, and cannot be restyled after export.
How do I use the generated blob?
Copy the SVG code and paste it inline into your HTML to style with CSS, or download the file to use as an image or background. To embed it in CSS, convert it to a data URI with the SVG to data URI tool.
Can I recolour it after generating?
Yes. The colour is a single fill attribute in the SVG. Change that value in the code, or set it with CSS if you inline the SVG, without regenerating the shape.
Where do blob shapes work best?
Behind marketing hero sections, cards, illustrations and empty states, where an informal look suits. Keep them low-contrast behind text, use one or two per view, and reuse a few shapes for a consistent feel.
Privacy & Security
Generated locally.
About This Tool
This tool runs entirely in your browser. No data is sent to any server, ensuring complete privacy. Simply use the interface above to get started — no registration or login required.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.
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