Glassmorphism CSS Generator
Generate glassmorphism CSS effects online. Adjust blur, saturation, background opacity, border, border-radius, and box-shadow with live preview. Outputs backdrop-filter + -webkit-backdrop-filter fallback. 100% browser-based.
How to Use
- Pick a Background Color and set Background Opacity (10–25% is typical).
- Increase Blur (10–20px recommended) to get the frosted-glass effect.
- Adjust Saturation to control color vibrancy behind the glass.
- Set a Border Color, Border Opacity, and Border Width — a thin semi-transparent border defines the glass edge.
- Round the corners with Border Radius (12–20px is a common sweet spot).
- Add a soft Shadow to lift the card off the background.
- Switch between background presets (Sunset, Ocean, Forest, Night, Aurora) to test your effect.
- Click Copy to copy the generated CSS to your clipboard.
CSS Output Reference
.glass {
background: rgba(255, 255, 255, 0.15);
backdrop-filter: blur(12px) saturate(180%);
-webkit-backdrop-filter: blur(12px) saturate(180%);
border: 1px solid rgba(255, 255, 255, 0.30);
border-radius: 16px;
box-shadow: 0 4px 24px rgba(0, 0, 0, 0.20);
}Common Glassmorphism Presets
- Light glass (white): background rgba(255,255,255,0.15), blur 12px, border rgba(255,255,255,0.3)
- Dark glass: background rgba(0,0,0,0.25), blur 16px, border rgba(255,255,255,0.1)
- Frosted strong: background rgba(255,255,255,0.25), blur 20px, saturation 200%
- Minimal: background rgba(255,255,255,0.08), blur 8px, no border
Browser Support Notes
backdrop-filter is supported in all major browsers (Chrome 76+, Firefox 103+, Safari 9+, Edge 79+). Always include both backdrop-filter and -webkit-backdrop-filter. For unsupported browsers, consider a fallback with a semi-opaque solid background.
Related Tools
- CSS Box Shadow Generator — fine-tune your shadow values
- CSS Variables Generator — store glass effect values as design tokens
- CSS Grid Generator — build the layout behind your glass cards
- CSS Flexbox Generator — arrange glass elements with flexbox
FAQ
What is glassmorphism?
Glassmorphism is a UI design trend that simulates frosted glass. Elements appear translucent with a blurred background, a subtle border, and a soft shadow — giving depth without opaque overlays. It became popular with Apple's macOS Big Sur in 2020.
What does backdrop-filter do?
The CSS backdrop-filter property applies graphical effects (blur, saturation, contrast, etc.) to the area behind an element, not the element itself. For glassmorphism, blur() and saturate() are the two key functions: blur creates the frosted-glass look, and saturate keeps colors vivid beneath the translucent surface.
Why is -webkit-backdrop-filter needed?
Safari requires the -webkit- vendor prefix for backdrop-filter. Without it, the effect silently disappears on Safari and iOS. Always include both backdrop-filter and -webkit-backdrop-filter with identical values to ensure cross-browser compatibility.
What background opacity should I use?
A background opacity between 10%–25% is typical for a convincing frosted-glass look. Too opaque and the blur becomes invisible; too transparent and the card loses legibility. Pair with a blur of 10–20px for best results.
Does glassmorphism affect performance?
backdrop-filter is GPU-accelerated in modern browsers, but applying it to many overlapping elements can still hurt frame rate. Limit its use to a small number of prominent cards. Avoid nesting glassmorphism elements inside each other.
Is this tool client-side?
Yes. All generation happens in your browser. No data is sent to a server.