Glassmorphism Generator

About the Glassmorphism Generator

This glassmorphism generator builds the frosted glass surface that has become a staple of modern interface design, using backdrop-filter rather than a static image. Set the backdrop blur up to 40 pixels, choose a fill opacity, push saturation between 100 and 250 percent to keep the colours behind the glass from washing out, then pick a tint colour and a border opacity. The output includes the -webkit- prefixed property alongside the standard one, and the preview sits over a gradient so you can see the effect actually working rather than a flat wash.

How to use the Glassmorphism Generator

1. 1

   Raise the Backdrop blur slider to soften whatever sits behind the card.

2. 2

   Set Fill opacity low, usually between 10 and 30 percent, so the blurred background still shows through.

3. 3

   Push Saturation above 100 percent to stop the blurred backdrop looking grey and lifeless.

4. 4

   Choose a Glass tint, set Corner radius and Border opacity, then copy the CSS including the -webkit- prefixed line.

What people use it for

How backdrop-filter produces the effect

backdrop-filter applies a filter function to everything painted behind an element, then draws the element on top of that filtered result. It is fundamentally different from filter, which processes the element and its own contents. The distinction explains the single most common complaint about glassmorphism — that the card looks like a plain solid colour. If there is nothing but a flat background behind the element, blurring it produces the same flat colour, so the effect is invisible. The card must sit above something with variation: a photograph, a gradient, or overlapping shapes. The element also needs to be at least partially transparent, because a fully opaque background paints over the filtered backdrop entirely. The saturate() function matters more than it first appears: blurring averages neighbouring pixels, which pulls colours towards grey, so pushing saturation to somewhere between 140 and 180 percent restores the vibrancy that the blur removed and is what separates convincing glass from a dull smear.

Browser support, prefixes and the performance cost

backdrop-filter is supported across all current browsers, but Safari shipped it behind -webkit-backdrop-filter for several years and older iOS versions still require the prefix, which is why both lines belong in the output. Firefox enabled it by default only in version 103, so a fallback is still worth writing: wrap the effect in a @supports (backdrop-filter: blur(1px)) block and give the plain rule a more opaque background so text stays readable when the filter is absent. The performance cost is genuine. The property forces the element onto its own compositing layer, and because the filtered region depends on whatever lies beneath, the browser must re-run the blur every time that content changes — which, during a scroll, is every frame. On lower-powered devices this shows up as stutter. Keep glass surfaces few and small, avoid applying them to large scrolling regions, and be wary of nesting one inside another.

The accessibility problem with glass

Translucency means the text on a glass card sits over content you cannot predict. WCAG requires 4.5:1 contrast for body text, and that ratio must hold against the lightest and darkest patches the background might contain, not against an average. A card that reads perfectly over the dark corner of a photograph can become illegible when the same layout is used with a bright image. There are two dependable fixes. The first is to raise the fill opacity until the effective background is stable enough to guarantee the ratio, accepting that the glass looks less transparent. The second is to place a solid or near-solid layer directly behind the text while keeping the surrounding card translucent, which preserves the aesthetic where it is decorative and abandons it where legibility is at stake. Also respect prefers-reduced-transparency, which some users set precisely because layered translucency makes interfaces hard to parse.