CSS Glassmorphism Generator — Frosted Glass Effect Free
Generate frosted-glass (glassmorphism) CSS with adjustable blur, opacity, border, and saturation. Live preview, copy-paste ready.
About 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.
- Modal dialogs and sheets. 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
- Set blur amount. backdrop-filter: blur(0–40px). 8–16px is typical; 4px is subtle, 24px+ heavy.
- 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.
- Set border. 1px rgba(255,255,255,0.18) for the iconic "glass edge"; subtle but it sells the effect.
- Set shadow + saturation. box-shadow softens float; backdrop-filter: saturate(1.5) bumps color through the glass for liveliness.
- 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.
Pro 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.
Reviewed by Ahsan Mahmood · Last updated 2026-05-06 · Part of ZTools.
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