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SVG Blob Generator

SVG blobs are organic, asymmetric closed shapes — the inverse of geometric circles and squares. They became a 2018+ design trend on landing pages, mobile-app illustrations, and marketing graphics, providing visual interest without the rigid feel of grid-aligned shapes. The ZTools SVG Blob Generator produces random blobs via mathematical perturbation of a circle (n control points placed on a circle, each radius offset by random amounts), with adjustable complexity (number of bumps), randomness (irregularity), and color/gradient. Output is a single <svg> element ready to paste into HTML, React (as JSX), or design tools.

Use cases​

Landing-page hero backgrounds​

A large pastel blob behind hero text adds movement and breaks the rectangular grid. Stripe, Notion, Slack marketing pages all use this pattern.

Avatar / profile picture backdrops​

Place a circular avatar over a blob shape for a softer, more organic profile-card look. Common in Dribbble shots and modern marketing.

Decorative section dividers​

Replace flat horizontal section breaks with blob-shaped transitions. Adds rhythm to long-scroll pages.

Empty-state illustrations​

Pair a blob with a centered icon for friendlier "no data" / "all done" / "nothing here yet" screens. Less sterile than plain icon-on-white.

How it works​

  1. Set complexity — 3–20 control points. More points = more bumps. 6–10 is the visual sweet spot.
  2. Set randomness — 0–100%. 0 = perfect circle; 100 = wild asymmetry. 30–60% is "blob-like".
  3. Pick color or gradient — Solid fill, two-stop linear gradient, or three-stop radial gradient.
  4. Re-roll for variation — Each click generates a new random blob with the same parameters — sample 5–10 and pick the best.
  5. Copy SVG — Single <svg> element with <path> — paste into HTML / JSX / design app. No external dependencies.

Examples​

Input: 8 points, 50% randomness, indigo

Output: Soft asymmetric blob suitable for hero background — saved as inline SVG.

Input: 15 points, 80% randomness, gradient

Output: Highly irregular blob with light-to-dark gradient — decorative accent shape.

Input: 6 points, 30% randomness, currentColor

Output: Subtle organic shape; inherits text color via currentColor.

Frequently asked questions​

Why SVG instead of PNG?

SVG scales infinitely without pixelation, has tiny file size (a blob is < 1KB), inherits CSS colors via currentColor, and animates trivially. PNG fixes you to one resolution and color.

How does the algorithm work?

N control points are placed on a circle, each at a slightly randomised distance from center. A Bézier curve smoothly connects them, producing the closed organic shape.

Can I animate the blob?

Yes — animate the SVG path's d attribute via SMIL or, more commonly, with a JS library that morphs between two blob shapes (e.g. blobs.app, or a custom morph-between-paths function).

Will it work in old browsers?

SVG support is universal (IE9+, all modern browsers). The blob path is just &lt;path d="..."&gt; — works everywhere SVG works.

Can I edit the blob in Figma?

Yes — paste the SVG into Figma; it converts to a vector shape you can edit point-by-point.

Are blobs accessible?

They're decorative — add role="presentation" and aria-hidden="true" to the SVG so screen readers skip them.

Tips​

  • Generate 5–10 blobs per design and pick the best — randomness means the first roll is rarely the best.
  • Use aria-hidden="true" on decorative blobs so screen readers skip them.
  • Keep blob complexity ≤ 10 for hero backgrounds; more bumps look noisy at large sizes.
  • Pair with currentColor and CSS variables for theme-aware blobs that change in dark mode.
  • For animated morphing, use a library like flubber.js to interpolate between two blob d attributes.

Try it now​

The full SVG Blob Generator runs in your browser at https://ztools.zaions.com/svg-blob-generator — no signup, no upload, no data leaves your device.

Open the tool ↗

Last updated: 2026-05-06 · Author: Ahsan Mahmood · Edit this page on GitHub