What CSS creates the glass effect?

Three properties working together. A translucent background-color set with rgba and a low alpha value, a backdrop-filter: blur() that produces the frost, and a subtle border using rgba with a slightly higher alpha to define the edge. All three are needed for the effect to read.

Which browsers support backdrop-filter?

Coverage is excellent in modern browsers — Chrome 76+, Safari 9+, Firefox 103+, and Edge 79+ all support it natively. Internet Explorer doesn't. iOS Safari from version 9 onward and Chrome on Android are both fine. Global coverage exceeds 90 percent as of 2024, and older browsers gracefully fall back to the translucent background without the blur.

Can I use it on any background?

For the effect to register, the layer beneath the glass needs to be visually complex — gradients, photographs, busy patterns. A glass card placed over a plain white background just looks slightly off-white because there's nothing for the blur to interact with.

Why does my glass effect not show?

Usually it's one of four issues: the background underneath is too plain, backdrop-filter isn't supported in the browser you're testing, the z-index or positioning is preventing the element from sitting over visible content, or the background's alpha is too high so it covers everything anyway. Verify each in turn.

It can be, but it takes care. The translucent surface plus busy background combination often produces text contrast below the WCAG 4.5:1 minimum. Solutions include using solid (not translucent) text colors, increasing the alpha on the glass background, and explicitly testing every text-on-glass combination with a contrast checker.

Does it impact performance?

Yes, more than people expect. backdrop-filter is a GPU-intensive operation, and stacking many glass elements on a single page can drag frame rates down on lower-end devices, especially mobile. One to three glass surfaces per view is comfortable; ten or more starts to cause real problems.

Is the data sent anywhere?

No. The generator is pure JavaScript string construction running in your browser. Your design choices never leave the page.

Glassmorphism Generator

Generate glassmorphism CSS effects with adjustable blur, transparency, and border. Free glass UI generator with live preview and copy-ready code.

CSS Tools Generators

Instant results

Preview

Glass Card

This is a glassmorphism effect with customizable properties.

Controls

Glass Color

Background Opacity: 0.25

Blur: 16px

Border Opacity: 0.20

Border Radius: 16px

Generated CSS

background: rgba(255, 255, 255, 0.25);
backdrop-filter: blur(16px);
-webkit-backdrop-filter: blur(16px);
border: 1px solid rgba(255, 255, 255, 0.2);
border-radius: 16px;

About Glassmorphism Generator

Generate CSS for the glassmorphism design trend featuring frosted glass effects. Adjust opacity, blur, border, and border radius to create the perfect glass card. The generated CSS includes vendor prefixes for cross-browser compatibility.

How to Use Glassmorphism Generator

Set background opacity

The background is rgba with a low alpha — typical values land between 0.05 and 0.3. Lower alpha lets more of the layer beneath show through, while higher alpha pushes the surface toward solid and reduces the glass effect.

Adjust blur intensity

The backdrop-filter blur radius controls how aggressively the layer beneath is frosted. Five pixels reads subtle, ten to fifteen is the typical sweet spot, and twenty or more produces a heavy, almost translucent-glass look.

Add border (optional)

A faint border with rgba alpha around 0.1 to 0.3 helps define the edge of the glass surface so it doesn't dissolve into the page. Skipping it sometimes works for full-screen overlays but tends to look unfinished on cards.

Copy CSS

The generator emits a ready-to-use block of CSS combining background, backdrop-filter, and border. Drop it into your stylesheet, apply the class to a card, modal, or button, and verify the contrast of any text on top against the intended background.

When to Use Glassmorphism Generator

Modern UI design

Glassmorphism became one of the defining looks of the 2020s, defined by translucent surfaces with backdrop blur that mimic frosted glass. The generator dials in the right combination of opacity, blur radius, and border so the effect actually reads on screen rather than disappearing into the background.

Card and modal design

A glass card layered over a colorful background or photograph adds depth that solid panels can't match. Modals and floating side panels work especially well in this style because they're meant to feel separate from the page they cover.

Apple-inspired design

Apple has leaned into glass surfaces across iOS, macOS, and visionOS, and aligning a web product with that aesthetic often comes down to getting the blur radius and translucency right. The generator gives you the exact CSS to start from.

Dashboard backgrounds

Modern SaaS dashboards from Stripe, Linear, and Notion all use subtle glass effects to layer information without making the interface feel busy. Reaching for the same technique in your own admin panels is a quick way to elevate the overall polish.

Glassmorphism Generator Examples

Standard glass card

Input

Frosted glass effect

Output

.card {\n  background: rgba(255, 255, 255, 0.1);\n  backdrop-filter: blur(10px);\n  border: 1px solid rgba(255, 255, 255, 0.2);\n  border-radius: 12px;\n}

This is the canonical recipe. A barely-there white background combines with a backdrop-filter that blurs whatever sits behind the card, and a slightly more opaque border defines the edge so the surface doesn't dissolve into its surroundings.

Dark mode glass

Input

Glass on dark background

Output

.card {\n  background: rgba(0, 0, 0, 0.2);\n  backdrop-filter: blur(10px);\n  border: 1px solid rgba(255, 255, 255, 0.1);\n}

Dark glass needs slightly different proportions. The background fill is a low-opacity black instead of white, and the border switches to a faint white edge so the card stands out against the (presumably) dark page beneath it.

Color-tinted glass

Input

Blue-tinted glass effect

Output

.card {\n  background: rgba(74, 144, 226, 0.1);\n  backdrop-filter: blur(10px);\n  border: 1px solid rgba(74, 144, 226, 0.3);\n}

Pulling the brand color into the rgba values lets the glass effect carry your visual identity rather than feeling generic. The same hue used for both background and border keeps the surface coherent without overwhelming the underlying content.

Tips & Best Practices for Glassmorphism Generator

1.Glassmorphism needs something interesting to blur. A glass card on a plain white background just looks like a slightly off-white rectangle, so place the effect over photos, gradients, or any visually rich layer.
2.backdrop-filter is well-supported in modern browsers but doesn't exist in Internet Explorer and was historically patchy in Firefox. Browsers without it gracefully degrade to the translucent fill, so the layout still works, just without the frost.
3.The blur is a GPU-intensive operation, and stacking many glass elements on one screen can drag frame rates down on lower-end devices. Use the effect on a few focal surfaces rather than every card on the page.
4.Used everywhere, the look becomes gimmicky fast. The most successful applications mix one or two glass surfaces with otherwise solid panels so the technique has somewhere to stand out.
5.A faint border (around 10 to 30 percent opacity) gives the card a defined edge and prevents it from melting into the background. Without it, the geometry can become hard to read against busy content.
6.Mobile performance varies more than desktop. Test on real hardware (not just emulators) and consider reducing the blur radius or skipping the effect entirely on devices where the frame rate suffers.

Frequently Asked Questions

Glassmorphism is a UI design style that mimics frosted glass. Surfaces sit translucent over the page beneath them, and a backdrop blur smears whatever's behind into a soft, abstract texture. Apple has leaned into the look across iOS and macOS, and it's become one of the defining web aesthetics of the 2020s.

Glassmorphism Generator

Glass Card

About Glassmorphism Generator

How to Use Glassmorphism Generator

Set background opacity

Adjust blur intensity

Add border (optional)

Copy CSS

When to Use Glassmorphism Generator

Modern UI design

Card and modal design

Apple-inspired design

Dashboard backgrounds

Glassmorphism Generator Examples

Standard glass card

Dark mode glass

Color-tinted glass

Tips & Best Practices for Glassmorphism Generator

Frequently Asked Questions

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