{"id":173,"date":"2026-05-04T22:32:04","date_gmt":"2026-05-05T02:32:04","guid":{"rendered":"https:\/\/simpletool.io\/blog\/?p=173"},"modified":"2026-05-04T22:32:04","modified_gmt":"2026-05-05T02:32:04","slug":"svg-blob-generator","status":"publish","type":"post","link":"https:\/\/simpletool.io\/blog\/svg-blob-generator\/","title":{"rendered":"SVG Blob Generator: Random Organic Shapes [2026]"},"content":{"rendered":"
TL;DR:<\/strong> An SVG blob generator creates organic, asymmetric shapes \u2014 like rounded amoeba silhouettes \u2014 using randomised cubic Bezier curves around a circle. Used as decorative backgrounds, hero accents, sticker-style highlights, and avatar masks. Our free SVG blob generator<\/a> ships a complexity slider, randomness control, gradient fills, and a seed value so you can re-generate the exact same blob later \u2014 plus PNG export with transparent background.<\/div>\n

Blobs are the visual mascot of late-2010s design \u2014 the Stripe, Notion, and Headspace school of organic shapes that fill awkward white space without looking like clip art. They work because the eye reads them as friendly and distinct from the rectangles that make up most of a UI. The trick is producing random-but-not-too-random curves: too uniform and the blob looks like a cookie-cutter circle; too chaotic and it looks like an inkblot.<\/p>\n

Our SVG blob generator<\/a> uses a noise-perturbed circle algorithm \u2014 start with N evenly-spaced points around a circle, perturb each radius by a controlled amount of noise, and connect the points with smooth cubic Bezier curves. Adjust complexity (number of points, 3 to 12) and randomness (how much each point can move). Lock a seed value to reproduce the exact shape, or shuffle for a fresh variation. Outputs SVG (preferred for scaling) or PNG with transparent background.<\/p>\n

When blobs work \u2014 and when they don’t<\/h2>\n\n\n\n\n\n\n\n\n\n\n
Use case<\/th>\nBlob OK?<\/th>\nNotes<\/th>\n<\/tr>\n<\/thead>\n
Hero section accent \/ background shape<\/td>\nYes<\/td>\nThe classic 2018-2024 Stripe \/ Notion look<\/td>\n<\/tr>\n
Decorative backdrop behind text<\/td>\nYes (with low opacity)<\/td>\nKeep contrast above WCAG threshold<\/td>\n<\/tr>\n
Avatar mask<\/td>\nYes<\/td>\nUsed as clip-path: path()<\/code> for image cropping<\/td>\n<\/tr>\n
Brand logo<\/td>\nNo<\/td>\nRandom shapes can’t be reproduced consistently<\/td>\n<\/tr>\n
Icon set<\/td>\nNo<\/td>\nUse shape primitives or hand-drawn SVGs<\/td>\n<\/tr>\n
Fintech \/ serious B2B UI<\/td>\nMaybe<\/td>\nTrends suggest the look is fading \u2014 verify against your brand<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

How blob shapes are generated (the algorithm)<\/h2>\n

The simplest blob algorithm: pick N points evenly around a circle (e.g., N=8 means one point every 45\u00b0), add or subtract a random amount from each point’s radius (e.g., \u00b115%), then connect the points with a smooth Catmull-Rom or cubic Bezier spline. The result is a closed organic shape.<\/p>\n

Two parameters control the look:<\/p>\n