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Formatiq / Generators / CSS Glassmorphism Generator

CSS Glassmorphism Generator

Client-sideNo sign-upFree

Build a frosted-glass panel effect with backdrop-filter blur, previewed against a busy background.

Quick facts

Category
Generators
Best for
Building a frosted-glass card or panel effect for a modern UI design
Live preview
Glass panel
Previewed against a busy gradient/pattern background so the blur effect is actually visible - a glass panel over a flat color would look identical with or without backdrop-filter.
Settings
CSS
background: rgba(255, 255, 255, 0.2);
backdrop-filter: blur(10px);
-webkit-backdrop-filter: blur(10px);
border: 1px solid rgba(255, 255, 255, 0.3);
border-radius: 16px;
box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
Both backdrop-filter and the -webkit-prefixed version are included since Safari has historically required the prefix. Browser support for backdrop-filter is broad but not universal, and very low background opacity combined with low-contrast text can hurt readability - check text contrast against whatever sits behind the glass panel.
In-content slot
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Overview

Build the "frosted glass" panel look using `backdrop-filter: blur()` combined with a semi-transparent background color, adjustable border opacity and width, border radius, and an optional drop shadow. The live preview sits on top of a busy gradient-and-pattern background specifically because a glass panel rendered over a flat color looks identical whether or not the blur is actually working - you need visual texture behind it to see the effect at all. Output includes both the unprefixed `backdrop-filter` and the `-webkit-backdrop-filter` fallback, since Safari has historically required the prefixed version, along with a note on browser support and on checking text contrast against whatever sits behind the panel. Runs entirely client-side.

Best for: Building a frosted-glass card or panel effect for a modern UI design

How to use this tool

  1. Set background color and opacity. Controls the semi-transparent base of the glass panel.
  2. Adjust blur, border, and radius. Blur amount, border opacity/width, and corner radius.
  3. Copy the CSS. Includes both backdrop-filter and the -webkit- prefixed fallback.

Frequently asked questions

Because backdrop-filter blur only becomes visible when there's something behind the glass panel worth blurring - over a flat, solid color, a blurred panel and a non-blurred panel look identical. The busy gradient-and-pattern background makes the blur effect actually visible.

Support is broad in current browsers but not universal, and Safari has historically needed the `-webkit-backdrop-filter` prefix, which is why both are included in the generated CSS. Always check text contrast against the real background behind your glass panel, since low background opacity combined with low-contrast text can hurt readability.

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