Glassmorphism Generator

Glassmorphism is a UI design trend that mimics frosted glass: a translucent panel with a blurred background, subtle semi-transparent border, and soft drop shadow. Popularised by Apple's macOS Big Sur and Microsoft's Fluent Design System, the style uses the CSS backdrop-filter property to apply real-time blur to whatever sits behind an element — creating a convincing sense of depth without heavy textures or complex gradients.

This generator gives you interactive sliders for every property and renders the result live on a colourful background so you can see exactly how the effect will look. When you are satisfied, click Copy to paste the six-line CSS snippet straight into your stylesheet.

How Glassmorphism Works in CSS

The effect relies on three CSS properties working together:

Property	Role
`backdrop-filter: blur()`	Blurs the content behind the element
`backdrop-filter: saturate()`	Boosts colour saturation through the glass
`background: rgba()`	Adds a semi-transparent tint to the surface
`border`	Creates the bright, thin highlight edge
`border-radius`	Rounds corners to match modern design conventions
`box-shadow`	Adds a soft shadow to separate the card from the background

The browser isolates the area directly behind the element, applies the filter, and composites it with the tinted background color before rendering. This happens on the GPU, so the effect is smooth even on animated backgrounds.

Controls Explained

Blur sets the radius of backdrop-filter: blur(). Values between 8 px and 20 px produce the most natural look. Pushing it above 24 px creates a strongly opaque feel that can obscure the background entirely.

Saturation amplifies the colours visible through the glass. A value of 160–200 % lifts the vibrancy of gradients and images showing through the panel.

Tint color and opacity define the rgba() background. White at 10–20 % gives classic light glass; black at 20–30 % gives dark glass; a brand colour at similar opacity creates a colourful variant. Keeping opacity below 0.3 preserves the transparency that makes the effect recognisable.

Border color and opacity add the defining edge. White at 25–40 % opacity on a 1 px border is the most common setting. Increasing width beyond 2 px shifts the look from glassy to framed.

Border radius rounds the corners. Values between 12 px and 24 px match current design conventions; 0 gives a sharp industrial panel.

Box shadow grounds the card. A large-radius, low-opacity shadow (0 8px 32px rgba(0,0,0,0.2)) reads as natural depth without looking like a sticker.

Quick Presets

Preset	Typical Use
Light	Panels on bright gradient or photo backgrounds
Dark	Cards on dark-themed pages or night-mode UIs
Frosted	High-blur, barely-tinted surfaces for a premium feel
Colorful	Accent panels matching a brand or vibrant palette

Click any preset to instantly load a balanced combination of all six properties, then fine-tune from there.

Browser Compatibility

backdrop-filter is supported in Chrome 76+, Edge 79+, Safari 9+ (with -webkit-backdrop-filter), Opera 63+, and Firefox 126+ on Linux and macOS. Always include the -webkit-backdrop-filter line — the generator outputs it automatically — because Safari requires the prefix even in current versions, and Safari accounts for virtually all iPhone and iPad traffic.

Usage Tips

Place the glass element over a colourful or photographic background. On a plain white or solid-colour surface there is nothing to blur, so the effect looks identical to a flat semi-transparent box.
Combine the card with overflow: hidden when placing images or inner gradients inside it so they respect the rounded corners.
Test on both light and dark themes if your site supports both — a white tint looks fine on dark backgrounds but nearly invisible on light pages.
Animate backdrop-filter values sparingly; blurring large areas at high frame rates can be expensive on mid-range mobile devices.
The box-shadow offset values (0 8px) in the generated CSS can be adjusted freely without regenerating — they are purely decorative positioning.

FAQ

What is `backdrop-filter` and how is it different from `filter`?

filter applies to the element itself and everything inside it. backdrop-filter applies only to the painted area behind the element, leaving the element's own content unaffected. This is what creates the frosted-glass illusion.

Does glassmorphism work without a colourful background?

The blur is always applied, but it is only visible when there is varied colour or texture behind the element. On a plain white or single-colour background the effect looks identical to an ordinary semi-transparent div.

Is `backdrop-filter` GPU-accelerated?

Yes. Browsers composite backdrop-filter on the GPU using a dedicated render layer. It is generally smooth even on complex pages, but applying it to many overlapping elements simultaneously can increase memory usage and cause frame drops on low-end devices.

Why must I include `-webkit-backdrop-filter`?

Safari requires the -webkit- prefixed version of the property regardless of the browser version. Without it, the blur and saturation have no effect in Safari, which means the glass panel appears as a plain coloured rectangle for all iPhone and iPad users.

Can I use this effect inside a dark-mode site?

Yes. Use the Dark preset as a starting point — black tint at around 25 % opacity with a subtle white border. Lower the saturation slightly if the background is already dark and muted.

How do I make the glass effect work in Firefox on Windows?

Older Firefox versions on Windows require enabling layout.css.backdrop-filter.enabled in about:config. Firefox 126 and later support it by default on all platforms. As a fallback, use a slightly higher tint opacity so the card remains readable if the blur is not applied.