Glassmorphism Generator

Glassmorphism Generator - Modern Glass Effect CSS

Create stunning glassmorphism effects for your web designs. This tool generates CSS code for the popular frosted glass UI trend, featuring backdrop blur, transparency, and subtle borders that create depth and visual hierarchy. Copy a complete, paste-ready .glass rule with a built-in @supports no-backdrop fallback so unsupported browsers stay readable.

What is Glassmorphism?

Glassmorphism is a modern UI design trend that creates a frosted glass effect. It uses:

- Semi-transparent backgrounds
- Backdrop blur filter
- Subtle borders for edge definition
- Soft shadows for depth

This style became popular in 2020-2021 and is used by Apple, Microsoft, and many modern web applications. It creates a sense of depth while maintaining readability.

How does backdrop-filter work?

The backdrop-filter CSS property applies effects to the area behind an element:

blur(10px) - Creates the frosted glass effect
saturate(180%) - Enhances colors behind the element
brightness() - Adjusts brightness
contrast() - Adjusts contrast

Important: The element must have a semi-transparent background for the effect to be visible. Full opacity will block the backdrop filter.

What browsers support glassmorphism?

Backdrop-filter support:

Chrome 76+ (full support)
Firefox 103+ (full support)
Safari 9+ (with -webkit- prefix)
Edge 79+ (full support)
Opera 63+ (full support)

Always include the -webkit- prefix for Safari:
backdrop-filter: blur(10px);
-webkit-backdrop-filter: blur(10px);

For older browsers, consider a solid fallback background.

Best practices for glassmorphism design

Tips for effective glassmorphism:

1. Use on colorful backgrounds - The effect works best over gradients or images
2. Keep blur moderate (8-20px) - Too much blur loses the glass feel
3. Use subtle transparency (15-30%) - Maintain readability
4. Add thin borders - Helps define edges
5. Consider contrast - Ensure text is readable
6. Use sparingly - Too many glass elements can be overwhelming
7. Test performance - Backdrop-filter can be GPU intensive

Why does my glass effect not show on Safari iOS but works on Chrome?

Safari needs the -webkit-backdrop-filter prefix in addition to backdrop-filter. The tool outputs both. Also iOS Safari requires the parent element to have an explicit background — even a 1px transparent layer behind — otherwise the GPU compositor skips the backdrop effect entirely.

How much does backdrop-filter blur impact rendering performance?

Significantly. backdrop-filter is GPU-intensive because the browser must rasterize the background, blur it, and composite. On low-end Android (Snapdragon 4xx, 2-3 year old) blur radii above 16px drop FPS from 60 to 25-30. Use 8-12px on production, avoid stacking multiple glass layers, and keep glass elements small (cards, not full-page overlays).

Will glassmorphism still look good in 2026 or is it dated?

Glassmorphism peaked 2020-2022 (macOS Big Sur, Windows 11) and has since softened. 2024-2026 trend leans toward subtler glass with neumorphism revival and bento-grid layouts. Glass still works for premium feel on hero sections, modal overlays and floating notifications. Use it accent, not as the primary aesthetic.

How can I provide a fallback for browsers without backdrop-filter?

Use CSS @supports feature query: @supports not (backdrop-filter: blur(10px)) { .glass { background: rgba(255,255,255,0.85); } } so unsupported browsers (older Firefox, IE) get a solid semi-transparent fill that maintains readability. Always test in Firefox Private mode where backdrop-filter was disabled by default until Firefox 103.

How do I keep text on a glass panel WCAG accessible?

Translucent glass is where most contrast audits fail. The text contrast must be measured against the worst-case background that can sit behind the blur, not against the glass fill itself. Practical rules:

1. Aim for at least 4.5:1 (AA) for body text and 3:1 for large text; target 7:1 (AAA) for critical UI
2. Lower the transparency (raise the solid background) until the text passes over the brightest and darkest areas of your backdrop
3. Prefer dark text on light glass over light backgrounds, and white text on dark glass over dark backgrounds
4. Add a subtle text-shadow or a slightly more opaque fill behind the text if the backdrop is busy
5. Re-check contrast with the @supports fallback active, since the solid fallback changes the effective background

Verify the final value in a contrast checker, not by eye.

How do I use the generated .glass class with the @supports fallback?

Turn on "Full CSS rule + fallback" and the tool wraps every declaration in a reusable .glass selector, then appends an @supports not (backdrop-filter: blur(1px)) block that swaps in a higher-opacity solid background. Paste the whole snippet into your stylesheet and add class="glass" to any card, modal or navbar — no hand-writing the feature query. The fallback opacity is computed from your chosen transparency, so browsers that disable backdrop-filter (Firefox Private mode, older engines) still render a readable solid panel that matches your design. Toggle the switch off to copy the raw declarations only.

Key Features

• Adjustable blur intensity (0-50px)
• Transparency control for glass effect
• Saturation enhancement option
• Customizable border radius
• Background and border color pickers
• Optional shadow effects
• Multiple background presets
• 6 ready-to-use style presets
• Live preview with instant updates
• Copy a complete, paste-ready .glass CSS rule
• Built-in @supports no-backdrop fallback for readability
• Toggle between full rule and raw declarations
• Copy CSS code to clipboard
• Vendor prefix included (-webkit-)
• 100% client-side processing
• Dark mode support
• Mobile-friendly interface