CSS Glassmorphism Generator

Create frosted-glass UI panels — tune the blur, fill, border, and radius, preview it, and copy the CSS.

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CSS Glassmorphism GeneratorNothing uploaded

Glass panel

Blur 20px · fill 0.20

Blur20px

Radius16px

Fill opacity0.20

Border opacity0.30

#ffffff

CSS

background: rgba(255, 255, 255, 0.2);
-webkit-backdrop-filter: blur(20px);
backdrop-filter: blur(20px);
border: 1px solid rgba(255, 255, 255, 0.3);
border-radius: 16px;
box-shadow: 0 8px 32px rgba(0, 0, 0, 0.37);

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What is CSS Glassmorphism Generator?

Glassmorphism is the frosted-glass look — a panel that is translucent and blurred so whatever is behind it shows through as a soft, colorful wash. It has been a signature style for dashboards and modern marketing sites since it became practical for browsers, and it still reads as a distinct, polished surface rather than a plain rectangle.

The effect is built with one powerful property, backdrop-filter, which blurs the content painted behind an element rather than the element itself. To make that readable the panel also carries a translucent background fill, a thin light border to give it an edge, and soft corner rounding to read as 'glass'. The balance between those four is what separates a clean frosted panel from a smudgy one — too much blur and the background detail disappears, too little fill and the text on top loses its contrast.

Backdrop-filter needs a vendor prefix in Safari and older WebKit browsers, so this tool emits both the prefixed and unprefixed lines — and always keeps the translucent background as a fallback so the panel stays legible where the effect isn't supported. That way the design intent survives even without the blur.

A standard glassmorphism panel combines these CSS declarations:

background: rgba(<tint>, <bg-alpha>); -webkit-backdrop-filter: blur(<px>); backdrop-filter: blur(<px>); border: 1px solid rgba(255, 255, 255, <border-alpha>); border-radius: <px>; box-shadow: 0 8px 32px rgba(0, 0, 0, 0.37);

• blur — how much the background is softened. Larger = more frost, less detail. Clamped to 0-100px. • bg-alpha — the fill's opacity, 0 (fully transparent) to 1 (solid, no glass). • border-alpha — the light edge's opacity. • radius — corner rounding. • tint — the base color of the fill as 6-digit hex.

For the effect to be visible, the glass element must sit on top of colorful content — a plain flat background yields an invisible blur. Verified current-browser support for backdrop-filter is excellent, and the fallback fill covers the rest.

Worked examples

blur 20, fill 0.2, border 0.3, radius 16, #ffffff → background: rgba(255, 255, 255, 0.2); backdrop-filter: blur(20px);
blur 8, fill 0.1, border 0.2, radius 12, #ffffff → a more subtle frosted card
blur 40, fill 0.05, border 0.4, radius 24, #ffffff → a strongly frosted hero panel

How to use CSS Glassmorphism Generator

Set the blur — start around 8-20px for a readable frosted panel.
Choose the fill opacity; near-transparent (0.1-0.3) reads most like glass.
Bump the border alpha and radius to give the panel a crisp edge.
Place the panel over a colorful background so the blur is visible.
Copy the CSS block and apply it to your panel element.

Common errors

The blur isn't showing — backdrop-filter only blurs what's painted behind the element. Put the panel over a colorful background (an image or gradient); on a flat single color there's nothing to blur.
Safari renders a sharp unblurred edge — the -webkit-backdrop-filter line is included precisely for this. If you removed it, older WebKit browsers lose the effect.
My text is unreadable — the backdrop filter isn't enough on its own. Raise the fill opacity or add a text-shadow to keep content legible over the blur.
The panel is invisible or shows no edge — a very low border alpha plus a translucent fill can look flat against a bright background; raise the border alpha.

FAQ

How does glassmorphism actually work?

A glassmorphism panel uses backdrop-filter to blur the content rendered behind it, plus a translucent background so that blurred color shows through tinted. The blur applies to what's behind the element, not the element itself — which is why you must put the panel over colorful content to see it.

Do I need the -webkit- prefix?

Yes, for Safari and older WebKit browsers. This generator emits both -webkit-backdrop-filter and the unprefixed backdrop-filter so the effect works across browsers. The plain translucent background is kept as the fallback for browsers that support neither.

Why is my glass panel invisible?

Glass needs something behind it to blur. If the panel sits on a flat, solid background there is no detail to frost, so it looks nearly blank. Put it over an image or gradient and the effect appears. A very low fill opacity also contributes.

Can I use this on production sites?

Yes. backdrop-filter is supported in all current browsers, and every generated block ships with the prefix and a translucent fallback, so the panel remains legible even where the effect is unsupported.

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