generating backgrounds…
Every pattern on this page is code, rendered in your browser right now — the hero above included. Tune it, export it, ship it. No stock images, ever.
CoolBG.com is a free, browser-based tool for designers and developers who need a background without hunting through stock-photo sites. Every gradient, SVG pattern, color palette, duotone, stripe set, grain texture, and animated mesh you see here is generated by code the moment the page loads — nothing is pulled from a database or an image library, and nothing you create is ever uploaded to a server.
Pick a style from the category filters, fine-tune colors, angle, density, and noise in the live editor, then export it as a PNG at desktop, mobile, or 4K resolution, or grab the raw SVG for vector patterns. Every background you customize can be shared as a link that reproduces the exact same result for anyone who opens it.
How to generate a CSS gradient background in seconds, understand linear vs radial gradients, and copy production-ready code for your site.
A practical guide to SVG background patterns — circles, triangles, grid, and wave styles — with a free generator and guidance on file size and accessibility.
Mesh gradients explained simply, plus how to generate one in your browser and export it as a background image or animated canvas.