Glassmorphism CSS Generator — Frosted Glass Effect
Create the frosted-glass UI effect visually and copy cross-browser CSS with this free online glassmorphism generator. Adjust backdrop blur, background transparency, saturation, and border subtlety with live sliders over a colorful backdrop — exactly how the effect will read in a real interface.
Glassmorphism — translucent panels that blur whatever sits behind them — defines the look of modern operating systems and premium web dashboards. The effect hinges on balancing blur radius, alpha, and border highlights; this generator lets you dial in that balance by eye and outputs the complete rule, including the -webkit-backdrop-filter prefix Safari still needs.
How to Create a Glassmorphism Effect in CSS
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Set the blur
Adjust the backdrop-filter blur radius — the core of the frosted-glass look.
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Tune transparency and saturation
Balance the background alpha so content behind stays visible but text on the glass remains readable; boost saturation for vibrancy.
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Add the border highlight
A subtle semi-transparent border sells the glass edge — adjust its opacity to taste.
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Copy the CSS
Grab the full cross-browser rule, Safari prefix included, and paste it onto your card, navbar, or modal.
Features of the Glassmorphism Generator
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True live preview
The glass panel sits over a vivid backdrop so you see the real frosted effect, not an approximation.
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Every parameter exposed
Blur, transparency, saturation, and border opacity — the four levers that define believable glass.
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Cross-browser output
Includes -webkit-backdrop-filter so the effect works in Safari as well as Chrome, Edge, and Firefox.
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Readability-aware
Tune contrast between the glass surface and its content before shipping an unreadable panel.
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One-click copy
Complete, minimal CSS ready for cards, navbars, sidebars, and modals.
Frequently Asked Questions
What CSS creates the glassmorphism effect?
The core recipe: a semi-transparent background (e.g. rgb(255 255 255 / 0.1)), backdrop-filter: blur(12px), and a subtle semi-transparent border, usually with rounded corners. This generator lets you tune each value visually and copies the full rule.
Why doesn't backdrop-filter work in my browser?
Safari requires the -webkit-backdrop-filter prefix (included in the generated code). Also confirm the element's background has transparency — a fully opaque background hides the blur entirely.
How do I keep text readable on a glass panel?
Increase the background alpha slightly, raise the blur, or add a faint dark/light tint behind the text. Always check contrast against the busiest possible backdrop, not just the prettiest one.
Does backdrop-filter affect performance?
Blur is one of the costlier CSS effects, especially over animated content or on large surfaces. Use it on contained panels rather than full-screen layers, and test on mid-range mobile devices.