CSS Glassmorphism Generator
The problem: CSS glassmorphism requires coordinating backdrop-filter, background opacity, border and box-shadow — getting all four right by hand takes dozens of trial rounds.
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CSS Glassmorphism Generator: the complete guide
A CSS glassmorphism generator lets you design the frosted-glass UI style visually — adjusting blur, transparency, saturation, border opacity, shadow intensity and border radius with sliders — then outputs production-ready CSS and SCSS. Glassmorphism became mainstream as an Apple-inspired UI trend in 2020–21 and remains popular for card components, modal overlays, navigation bars and hero sections. The effect requires coordinating four CSS properties simultaneously: backdrop-filter for blur and saturation, a semi-transparent background, a subtle light border, and a soft box-shadow. Getting all four right by hand typically requires dozens of browser refreshes — this tool makes it a two-minute drag operation.
The four CSS properties that create the glass effect
backdrop-filter: blur(Xpx) is the core property — it applies a Gaussian blur to whatever is behind the element. Most glass effects use 8–20px blur. saturate(Y%) is usually combined to make the blurred background more vivid and glass-like. Without saturation, the blur makes the background look milky; with 150–200% saturation it looks like real frosted glass. The background-color must be semi-transparent rgba() — if it is fully opaque the backdrop-filter is hidden. Typical values are rgba(255,255,255,0.1) to rgba(255,255,255,0.25) for white glass and rgba(0,0,0,0.2) to rgba(0,0,0,0.4) for dark glass. The border, usually 1px solid rgba(255,255,255,0.2), creates the specular highlight that makes the glass edge visible against the blurred background.
Dark mode and browser compatibility
The generator outputs a @media (prefers-color-scheme: dark) block with a separate background color for dark mode, ensuring the glass card remains legible on dark backgrounds. Browser support for backdrop-filter requires the -webkit-backdrop-filter prefix for Safari and older Edge versions — both are included in the output. Chrome, Firefox 70+, Safari and Edge Chromium all support backdrop-filter fully. The main caveat is performance: backdrop-filter triggers GPU compositing and can cause jank on mobile devices when animating or when applied to many overlapping elements. Use it on a small number of key elements, not on every card in a long list.
Step by step: how to use Glassmorphism
- 1
Click a preset (Frosted Glass, Crystal Card, Dark Smoke, Minimal Mist) to start from a good baseline.
- 2
Adjust the Blur slider — 8–16px is the typical glassmorphism range.
- 3
Set Background Opacity to control how much of the background shows through (0.05–0.25 works well).
- 4
Use Border Opacity and Shadow Intensity to define the glass edge and depth.
- 5
Adjust Border Radius for card corners — 12–24px is common.
- 6
Switch between CSS and SCSS tabs, then click Copy to get production code.
Security & privacy
All computation is local JavaScript arithmetic on slider values. No design data, color choices, or configurations leave your browser. This is especially relevant when designing with unreleased brand colors — your design tokens stay on your device.