How to use Glassmorphism Generator
Generate frosted-glass (glassmorphism) CSS with real-time controls for backdrop blur, background transparency, color, border opacity, border width, border radius, and drop shadow. Preview the glass card over four sample gradient backgrounds. Copy the complete CSS including the -webkit-backdrop-filter fallback for maximum browser compatibility.
- Choose a preview background gradient to see the glass effect over a colorful scene.
- Drag the Blur slider to set the backdrop-filter blur intensity — 8–16px is typical for UI cards.
- Adjust Background Opacity to control transparency — 10–30% creates a convincing glass look.
- Pick a Background Color — white (#ffffff) is standard; tinted glass uses brand colors at low opacity.
- Set Border Opacity and Width for the subtle frosted-edge highlight typical of glassmorphism.
- Adjust Border Radius to round the card corners to your design.
- Tune Shadow Blur and Shadow Opacity for depth beneath the glass card.
- Copy the CSS output — it includes both backdrop-filter and -webkit-backdrop-filter.
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backdrop-filter and browser support
The backdrop-filter CSS property applies visual effects (blur, brightness, contrast, etc.) to the area behind an element — making content behind the element visible but visually processed. Unlike filter, which affects the element itself, backdrop-filter affects what is beneath it. The -webkit-backdrop-filter prefix is required for Safari on macOS and iOS, where it has been supported since Safari 9 (2015). Chrome and Edge support unprefixed backdrop-filter since 2019 (Chrome 76). Firefox added support in 2022 (Firefox 103). For older Firefox, a semi-transparent background-color fallback ensures the text remains readable even when the blur effect is unsupported.
| Browser | backdrop-filter support | -webkit- needed? |
|---|---|---|
| Chrome / Edge 76+ | Yes | No |
| Safari (all versions) | Yes | Yes |
| Firefox 103+ | Yes | No |
| Firefox < 103 | No | No (falls back to bg-color) |
| iOS Safari 9+ | Yes | Yes |
Glassmorphism design principles
Effective glassmorphism requires four elements working together: a blurred, semi-transparent background that reveals depth; a subtle white or light-colored border at low opacity (15–40%) that simulates the refracted edge of real glass; a soft drop shadow for elevation; and a colorful background scene — gradients, images, or patterns — visible through the glass. The glass card should have enough background opacity (typically 15–30%) that text on it meets WCAG AA contrast requirements. Avoid using glassmorphism for primary navigation or dense text UI — it works best for accent cards, modals, and hero overlays.
Worked examples
Frosted glass card
Inputs: blur 12px · white 20% · border 30%
Result: backdrop-filter: blur(12px); background: rgba(255, 255, 255, 0.2)
Tinted glass
Inputs: blur 10px · indigo 15%
Result: background: rgba(99, 102, 241, 0.15) with a 10px backdrop blur
Glossary
- backdrop-filter
- A CSS property that applies graphical effects (blur, brightness, etc.) to the area behind an element, not the element itself.
- Glassmorphism
- A UI design trend using frosted-glass-like translucent surfaces with backdrop blur, subtle borders, and semi-transparent backgrounds.
- -webkit-backdrop-filter
- The vendor-prefixed version of backdrop-filter required for Safari and older WebKit browsers.
- rgba()
- A CSS color function with a fourth alpha parameter for transparency: rgba(red, green, blue, alpha) where alpha is 0–1.
- Frosted glass effect
- A visual style where a blurred translucent surface partially obscures the content behind it, mimicking etched or frosted glass.
Related reading
Frequently Asked Questions
Why use Glassmorphism Generator?
- Generates both backdrop-filter and -webkit-backdrop-filter in one output for full Safari support
- Four preview gradient backgrounds let you validate glass legibility before committing to CSS
- Border opacity slider replicates the subtle refracted-edge highlight characteristic of real glass
- Background color and opacity controls help ensure text on the glass card can meet WCAG AA contrast
Common use cases
- Building a frosted-glass hero card for a SaaS landing page over a colorful gradient background
- Creating a translucent navigation bar that blurs page content as the user scrolls beneath it
- Designing a modal overlay with glassmorphism to reduce visual weight compared to a solid backdrop
- Testing tinted glass (rose, indigo) against multiple gradient backgrounds before writing any CSS
- Tuning backdrop-filter blur intensity on a product card to balance aesthetics with mobile performance
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