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Generate frosted glass CSS effects with live preview
Background Preset
Background Color
Box Shadow
Subtle drop shadow for depth
Live Preview
Glassmorphism
A frosted-glass UI card with backdrop blur, transparency, and a soft border. Built with pure CSS.
Generated CSS
.glass { background: rgba(255, 255, 255, 0.25); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border-radius: 16px; border: 1px solid rgba(255, 255, 255, 0.2); box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.1);}Run your projects on Claude Code?
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Get the Claude Code Production Pack — $29Glassmorphism is a UI design trend characterized by frosted-glass panels — elements with semi-transparent backgrounds, backdrop blur, and subtle borders that simulate light refraction. The effect is achieved with the CSS backdrop-filter property (CSS Filter Effects Level 2 specification) combined with rgba background colors and border styling. Unlike a solid colored panel, a glassmorphism card takes on the hues of whatever is rendered behind it, creating a sense of depth and layering that works especially well over gradient or photographic backgrounds.
The generator controls four CSS properties: backdrop-filter: blur(Xpx) which applies a Gaussian blur to content behind the element, background: rgba(R,G,B,A) which sets the tinted semi-transparent fill, border: 1px solid rgba(R,G,B,A) which provides the edge highlight, and border-radius for the rounded corners.
The live preview renders the glass panel over a selectable gradient background from a set of vibrant presets. This is essential for evaluating the effect — on a white background, the glass appears nearly invisible. The preview switches instantly between background presets without changing the glass settings, allowing rapid evaluation of how the effect reads across different backgrounds.
The output CSS includes -webkit-backdrop-filter alongside backdrop-filter for compatibility with older Safari versions (Safari required the -webkit- prefix through version 12.1). Both declarations produce identical visual output on modern Safari.
A designer implements a notification card overlay that floats over a blurred hero image, using a glassmorphism panel to maintain visual hierarchy without blocking the background.
A developer builds a settings sidebar that overlays a data-heavy dashboard, using the frosted glass effect to visually separate the panel from the content behind it.
A frontend engineer creates a glassmorphism pricing card for a landing page hero section, adjusting the blur and opacity until the text remains readable over the gradient background.
A developer experiments with different blur and opacity combinations to find the right balance between visual transparency and background contrast for a modal dialog.
Adjust the blur, opacity, and border radius sliders
Pick a background color for the glass effect
Choose a gradient background preset to see the glass in context
Copy the generated CSS with one click
About the Glassmorphism Generator
Glassmorphism is a UI design trend using frosted glass effects — created with CSS backdrop-filter: blur() combined with semi-transparent backgrounds and subtle borders.
All modern browsers (Chrome, Firefox, Safari, Edge) support backdrop-filter. The generated CSS includes the -webkit- prefix for older Safari versions.
All processing happens in your browser. Nothing is uploaded to any server.
backdrop-filter applies CSS filter effects (blur, brightness, etc.) to whatever is rendered behind the element in the stacking context. If there is no content behind the element — such as a plain background color on the body — the blur has nothing to operate on and appears transparent. The glass effect requires layered content, typically a gradient or image in a parent element.
The classic glassmorphism recipe uses: background: rgba(255,255,255,0.15); backdrop-filter: blur(10px); border: 1px solid rgba(255,255,255,0.25); border-radius: 16px. The translucent border on the top and left edges simulates light refraction at the glass surface. The generator exposes all four parameters via sliders and updates the preview live.
Yes. backdrop-filter triggers GPU compositing, which offloads the blur computation to the graphics card. This is generally fast on modern devices but can cause frame drops on complex pages with many blurred elements or on low-end hardware. Use sparingly — one or two glassmorphism panels per page is typical; dozens of them can degrade scroll performance.
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