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CSS Glassmorphism Generator

Glassmorphism is the frosted-glass UI style popularised by macOS Big Sur (2020), iOS 14, and Microsoft Fluent Design — semi-transparent panels with backdrop blur, a thin light border, and a subtle drop shadow. It works only over visible content (gradient or photo backgrounds); on flat backgrounds it disappears. The ZTools Glassmorphism Generator dials in backdrop-filter: blur() + background: rgba() + border + box-shadow, with a live preview over a sample gradient and copy-paste CSS. Browser support is ≈98% in 2026 (Safari 9+, Chrome 76+, Firefox 103+).

Use cases​

Floating navigation bars​

Sticky headers/sidebars over a photo or gradient hero. The blur reads as "I'm above the content" without obscuring it. Apple-style polish.

Frosted-glass overlay dialogs feel less heavy than opaque white modals. Common in iOS/macOS-influenced design systems.

Stats / metric cards on a vibrant dashboard​

Glass cards over a colored or gradient dashboard background — the underlying color hue still reads, the card itself stays legible.

Login/signup over hero imagery​

Form on a glass panel over a marketing photo. Photo provides emotion; glass provides legibility. Very common SaaS landing-page pattern.

How it works​

  1. Set blur amount — backdrop-filter: blur(0–40px). 8–16px is typical; 4px is subtle, 24px+ heavy.
  2. Set background tint — rgba(255,255,255,0–0.5) for light glass; rgba(0,0,0,0–0.5) for dark glass. 0.15–0.30 alpha is the sweet spot.
  3. Set border — 1px rgba(255,255,255,0.18) for the iconic "glass edge"; subtle but it sells the effect.
  4. Set shadow + saturation — box-shadow softens float; backdrop-filter: saturate(1.5) bumps color through the glass for liveliness.
  5. Copy CSS — Includes -webkit-backdrop-filter for Safari + the glass shorthand.

Examples​

Input: Light glass: blur 12px, bg rgba(255,255,255,0.25), border rgba(255,255,255,0.18)

Output: Apple-style light glass — works over any gradient or photo.

Input: Dark glass: blur 16px, bg rgba(15,23,42,0.4), border rgba(255,255,255,0.06)

Output: Dark-mode glass for night dashboards.

Input: Strong glass: blur 24px + saturate(1.8)

Output: Heavy frosted blur with vivid color punch — splash screens, hero CTAs.

Frequently asked questions​

Does glass work over solid backgrounds?

No — without underlying detail to blur, the panel is just a translucent rectangle. Pair glass with gradients, photos, or animated content.

Why is the blur not showing in Safari?

Safari requires -webkit-backdrop-filter (the unprefixed version was added in Safari 18). Always include both. The generator adds them automatically.

Performance impact?

backdrop-filter is GPU-accelerated but expensive. Don't apply to hundreds of elements simultaneously. Modern devices handle a few glass panels easily; mid-range Android phones may stutter on full-screen glass scroll.

Accessibility concerns?

Translucent panels can drop contrast below WCAG thresholds. Test text contrast over the worst-case background. Increase tint opacity (0.6–0.8) when text legibility wins over visual style.

Why does my glass look "muddy"?

Insufficient saturation. Add backdrop-filter: blur(Npx) saturate(1.4) — saturation pulls color through the blur and prevents the gray-mud look.

Can I use it for buttons?

Yes — small glass buttons over a photo hero are popular. Stick to simple shapes and increase border opacity to compensate for small surface area.

Tips​

  • Start with blur 12px + alpha 0.25 + saturate 1.4 — these defaults work for 80% of cases.
  • Always include -webkit-backdrop-filter for Safari 9–17.
  • Use a 1px white-translucent border on the top/left edges only for a "lit-from-above" look.
  • For dark mode, drop background alpha to 0.4–0.5 and use rgba(0,0,0,...) instead of pure black tint.
  • Test contrast at the lowest underlying color value — buttons must remain WCAG AA against worst-case background.

Try it now​

The full CSS Glassmorphism Generator runs in your browser at https://ztools.zaions.com/css-glassmorphism-generator — no signup, no upload, no data leaves your device.

Open the tool ↗

Last updated: 2026-05-06 · Author: Ahsan Mahmood · Edit this page on GitHub