Glassmorphism Generator

About this tool

Glassmorphism became a dominant UI trend when Apple introduced blurred translucent panels in macOS Big Sur — the design language of frosted glass cards layered over vibrant content. Implementing it in CSS requires coordinating four properties: a translucent rgba background, backdrop-filter for the blur, an optional saturation boost, and a hairline rgba border for the glass edge. Getting these to coexist well — with the right alpha so the glass reads as frosted rather than muddy — takes iteration. The Glassmorphism Generator assembles all four in one panel with a live preview over a colorful gradient backdrop, so you see whether your glass card actually reads as glass before copying the CSS. Outputs include the -webkit-backdrop-filter vendor prefix for Safari compatibility.

Why use it

• Backdrop Blur: Tune the blur radius from 0px to 40px to control how strongly the background content blurs through the glass surface. Lower values look like tinted translucent glass; higher values produce the thick frosted appearance associated with modern glassmorphism UI.

• Alpha Fill: The Background opacity slider sets the alpha of a white rgba() fill from 0 to 1. Values between 0.05 and 0.25 read as frosted glass; higher values make the element look like milky plastic rather than glass.

• Border Highlight: The Border opacity slider sets the alpha of a 1px solid white rgba() border that traces the glass edge like a light reflection. A subtle edge makes the card appear to have physical thickness.

• Saturate Boost: The Saturation slider (50–240%) is written into backdrop-filter next to the blur. Values above 100% intensify the colors behind the glass, so the card feels vibrant rather than washed out over colorful backdrops.

• Live Preview: The preview shows your glass card rendered over a sample gradient backdrop so you can evaluate the effect in a realistic context. A glass card over a white background looks nothing like one over a colorful photograph — always test over representative content.

• Production CSS: The output includes both backdrop-filter and -webkit-backdrop-filter, ensuring Safari renders the blur. Without the webkit prefix, Safari users see an opaque or un-blurred card. This generator handles the cross-browser boilerplate automatically.

How to use

1. Drag the Background opacity slider (0–100) to set how much of the backdrop shows through the white glass fill
2. Drag the Blur slider (0–40px) to tune the frosted depth — 8–20px covers most use cases
3. Set the Saturation slider (50–240%) to boost or mute the colors bleeding through; 100% leaves them unchanged
4. Adjust the Border opacity slider to strengthen or soften the white 1px hairline edge
5. Review the live preview over the sample gradient backdrop to check frosted appearance
6. Click Copy CSS to get the .glass-panel rule, including -webkit-backdrop-filter for Safari

When it helps

• When building a card UI that floats over a colorful hero gradient or background image
• When designing a modal or panel overlay that maintains context by letting the background show through
• When creating a navigation bar or sidebar with frosted-glass transparency over page content
• When adding a macOS or iOS visual language to a web app with translucent layered panels
• When placing a light frosted panel over a dark or photo-heavy page section
• When building a dashboard widget that should appear light and non-intrusive over data visualizations

Examples

Blur 10px, Saturation 100%, Background opacity 10, Border opacity 20

.glass-panel {
  backdrop-filter: blur(10px) saturate(100%);
  -webkit-backdrop-filter: blur(10px) saturate(100%);
  background: rgba(255, 255, 255, 0.10);
  border: 1px solid rgba(255, 255, 255, 0.20);
}

Blur 20px, Saturation 180%, Background opacity 15, Border opacity 30

.glass-panel {
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.30);
}

Blur 18px, Saturation 160%, Background opacity 24, Border opacity 45

.glass-panel {
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  background: rgba(255, 255, 255, 0.24);
  border: 1px solid rgba(255, 255, 255, 0.45);
}

Tips

• Glassmorphism only reads as glass when there is visible, colorful content behind the element — test over a real backdrop, not a white page
• Add saturate(180%) to backdrop-filter to amplify the colors bleeding through; the result is richer than blur alone
• Keep background alpha between 0.05 and 0.25 — higher values produce colored plastic, lower values produce invisible panels
• Always write both backdrop-filter and -webkit-backdrop-filter in your final CSS, in that order, for maximum browser compatibility
• Test text contrast against the busiest and brightest part of the backdrop — glass cards are notorious for failing WCAG contrast checks

Frequently Asked Questions

Glossary

Glassmorphism

A UI design aesthetic using frosted semi-transparent panels with backdrop blur, subtle rgba borders, and translucent fills to simulate layered glass surfaces.

Backdrop Filter

A CSS property that applies filter effects (blur, brightness, saturate, etc.) to the rendered content behind an element, creating frosted glass, light leaks, and similar effects.

Translucency

The optical property of allowing light to pass through with diffusion. In CSS, achieved with rgba background colors where the alpha channel is less than 1.

Frosted Glass

A glassmorphism variant where backdrop-filter blur is high enough to obscure details of the background while preserving color, mimicking the appearance of sandblasted or frosted glass.

Saturation

The intensity of color in an image or backdrop. backdrop-filter: saturate() amplifies or reduces hue intensity in the blurred backdrop content without affecting the element's own colors.

Vendor Prefix

A browser-specific CSS property prefix (-webkit-, -moz-, -ms-) required for experimental or partially-implemented features. -webkit-backdrop-filter is still needed for full Safari support.