Glassmorphism Generator: Create Frosted Glass UI Effects in Pure CSS

Glassmorphism — the frosted-glass effect popularized by iOS and Windows 11 — creates depth by showing blurred content through semi-transparent surfaces. Getting the right balance of blur, transparency, and border is fiddly. A generator lets you tune each parameter visually and preview against different backgrounds.

What Is Glassmorphism Generator?

A glassmorphism generator creates the CSS for frosted-glass UI elements. You control background opacity, blur intensity, border opacity, shadow depth, and border-radius. The tool previews your glass card over colorful backgrounds, images, and gradients so you can verify it works in any context.

How to Use Glassmorphism Generator on DevToolHub

1. Open the Glassmorphism Generator tool on DevToolHub — no signup required.
2. Set the background color and opacity (e.g., rgba(255,255,255,0.15)).
3. Adjust the backdrop blur intensity (4px–40px).
4. Configure the border (color, opacity, width) for the glass edge.
5. Fine-tune the shadow for depth perception.
6. Preview on different backgrounds (gradient, image, dark, light).
7. Copy the generated CSS.

Classic Frosted Glass Card

The standard glassmorphism effect:

background: rgba(255, 255, 255, 0.15);
backdrop-filter: blur(12px);
-webkit-backdrop-filter: blur(12px);
border: 1px solid rgba(255, 255, 255, 0.2);
border-radius: 16px;
box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);

The -webkit- prefix is still needed for Safari support. The subtle border adds a glass-edge effect.

Dark Glassmorphism for Overlays

A darker variant for modals and navigation:

background: rgba(17, 25, 40, 0.75);
backdrop-filter: blur(16px) saturate(180%);
-webkit-backdrop-filter: blur(16px) saturate(180%);
border: 1px solid rgba(255, 255, 255, 0.1);
border-radius: 12px;
box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);

Adding saturate(180%) to the backdrop filter makes colors behind the glass look richer, not washed out.

Glass Navigation Bar

A sticky navbar with glassmorphism:

nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  padding: 12px 32px;
}

/* Dark mode */
[data-theme='dark'] nav {
  background: rgba(15, 23, 42, 0.8);
  border-bottom-color: rgba(255, 255, 255, 0.1);
}

As the user scrolls, page content blurs behind the navbar — a premium UI touch used by Apple and Stripe.

Pro Tips

• Always include the -webkit- prefix — Safari requires -webkit-backdrop-filter for blur to work.
• Provide a fallback — older browsers ignore backdrop-filter; use a solid semi-transparent background as fallback.
• Don't over-blur — 8-16px blur is usually enough; higher values look smudgy rather than glassy.
• Test on dark backgrounds — glass effects that look great on light backgrounds often disappear on dark ones; adjust opacity accordingly.

When You Need This

• Creating floating cards over hero images and gradient backgrounds
• Building glass-effect navigation bars and sidebars
• Designing modal overlays with a premium feel
• Implementing Apple/iOS-style UI elements on the web