Make an SVG blob shape

Organic rounded shapes for avatars, backgrounds, and masks — seeded, smooth SVG paths you can copy or download.

Tools used in this guide

Blob generator

The job

Blobs soften grid layouts: behind an avatar, under a card, as a mask for a photo. Hand-drawing them takes a while; a seeded generator produces a new shape per seed and reproduces it exactly.

Shape the blob

Set size, complexity (point count), irregularity, smoothness, color, and seed. The SVG preview shows the result; copy the path or download the file for masks and backgrounds.

Seed + parameters fully determine the shape — note the seed to reproduce a blob later.
Higher irregularity makes bumps deeper; smoothness controls how round the transitions are.

Worked example

Size 400, complexity 7, irregularity 0.4, smoothness 1 at seed 42 gives a soft seven-lobed shape that works well as an avatar mask.

Where it stops

Single-color filled paths only — no gradients, strokes, or multi-blob compositions. Size is capped at 4096 px, complexity at 12 points. Output is SVG markup; raster export would need a separate step.