CSS Glassmorphism Generator

By Bogdan Sandu · Published 9 June 2025 · Last updated 13 September 2026

This CSS Glassmorphism Generator builds the frosted-glass effect from four sliders and hands you the CSS. The preview shows the same values on a card and on a modal, over floating shapes that give the blur something to work with.

What you can set:

• Blur from 0px to 20px, the radius passed to backdrop-filter: blur()
• Transparency from 0 to 1, the alpha channel of the white panel background
• Outline from 0px to 5px, the width of the semi-transparent white border
• Saturation from 100% to 200%, applied through saturate() so the colors behind the glass come through stronger

Three presets give you a starting point: Subtle (5px blur, 0.2 alpha), Bold (15px blur, 0.4 alpha, 2px outline), and Frosted (20px blur, 0.1 alpha, no outline). Shuffle picks random values, Reset restores the defaults, and Copy puts the CSS on your clipboard. Everything runs in your browser.

How to Use This CSS Glassmorphism Generator

1. Click a preset, or drag the four sliders until the card and modal previews look right.
2. Keep an eye on the text inside the card. If it gets hard to read, lower the blur or raise the transparency value.
3. Click Copy and paste the block into the rule for your panel, card, or navigation bar.
4. Make sure the element sits over a gradient or an image. Over a flat color, the blur has nothing to show.

With the default values the generator outputs this:

.glass-panel {
  background: rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(10px) saturate(180%);
  -webkit-backdrop-filter: blur(10px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 16px;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

The selector is yours to add. The tool copies only the declarations, so they drop into any existing rule.

What the tool does not do

• The panel color is always white. For tinted glass, change the first three numbers in rgba(255, 255, 255, …) to your brand color. A HEX to RGB converter gives you the channel values.
• Border color, corner radius, and shadow are fixed at rgba(255, 255, 255, 0.3), 16px, and 0 4px 30px rgba(0, 0, 0, 0.1). Tune them afterwards with the CSS Border Radius Generator and the CSS Box Shadow Generator.
• It exports plain CSS only, no SCSS or Tailwind. The default values map to Tailwind's backdrop-blur-[10px] backdrop-saturate-[1.8] bg-white/30 border border-white/30 rounded-2xl.
• It does not add a fallback. For browsers without backdrop-filter, wrap an opaque background in an @supports block, as shown in the step-by-step section below.

What Is a CSS Glassmorphism Generator?

A CSS glassmorphism generator is a browser-based tool that turns slider inputs into ready-to-use CSS for the frosted-glass interface effect.

The look itself, glassmorphism, borrows its name from real glass: semi-transparent panels that blur whatever sits behind them. Michal Malewicz of Hype4.Academy coined the term in an article published in November 2020. It stuck because it gave a scattered visual trend a single, searchable name.

What a generator hands back, once you stop dragging sliders:

• A live preview of the glass panel against a sample background
• Copy-ready CSS, or Tailwind classes on a few tools
• Adjustable controls for blur, transparency, border, and sometimes corner radius

Instead of eyeballing blur and opacity values off a static mockup, you drag a few sliders and copy the resulting code. No manual math on rgba alpha channels, no guessing at the blur radius.

Most tools, this one included, export plain CSS. A smaller number hand back Tailwind utility classes or SCSS variables instead, which matters once you get to picking a workflow.

What CSS Properties Produce the Glassmorphism Effect?

Four CSS properties combine to build the glass look: backdrop-filter, a translucent background-color, a subtle border, and box-shadow.

Drop any one of the four and the effect reads as flat instead of glassy. Drop backdrop-filter specifically and there is no blur at all, just a see-through box.

backdrop-filter and Blur Radius

Core property: backdrop-filter blurs the painted area behind an element, using blur() as its most common filter function.

• Low blur (around 5px to 8px): background stays partly readable through the panel
• Mid blur (around 10px to 16px): the common default in most generators
• High blur (20px and up): background dissolves into a soft wash of color

Older Safari versions need the property duplicated as -webkit-backdrop-filter, a vendor prefix that most generators, including this one, add automatically.

Background Color and Alpha Transparency

Alpha value: background-color runs through rgba() or hsla() so the panel color stays see-through instead of solid.

Converting a brand color from hex into an rgba value with the right alpha channel is the fiddly part. A HEX to RGB converter saves the manual math.

Most generators default the alpha value somewhere between 0.1 and 0.3. Push past 0.4 and the panel stops looking like glass and starts looking like a tinted window.

Border and Shadow Layering

Glass edge: a 1px border in a light, semi-transparent white fakes the reflective rim you'd see on real glass.

Box-shadow does the rest of the work. It adds a soft drop shadow so the panel reads as floating above the background rather than sitting flush against it. A CSS box shadow generator handles the offset and blur-radius math if you're building the shadow separately.

Skip the shadow and the panel looks pasted on. Skip the border and the edges disappear into whatever sits behind them.

What Background Does a Glass Element Need to Work?

A glass panel needs a busy layer behind it, gradient or image, because blur has nothing to diffuse over a single flat color.

Generating a smooth CSS gradient behind the panel is one reliable way to give the blur something to work with. Multi-stop gradients blur into soft color transitions that look intentional rather than muddy.

Apple's own rollout of this look depended on exactly this requirement. macOS Big Sur shipped on November 12, 2020, pairing translucent menu bars with dynamic, color-shifting wallpapers. Those wallpapers give the blur a moving texture.

Put the same glass panel over a plain white or single-color background and the effect goes flat. There is nothing for the blur to diffuse, so the panel just looks like a slightly foggy rectangle.

What tends to work, and what doesn't:

• Works: photographs, multi-stop gradients, colorful app screenshots
• Works poorly: solid brand colors, plain white or near-white backgrounds

Which Browsers Support backdrop-filter?

Backdrop-filter now works in every major browser, though full, unprefixed support took years to arrive across the board.

Getting the same glass look to render identically everywhere used to be one of the messier cross-browser compatibility problems in CSS. That gap has mostly closed.

Key figures, per the Web Platform Baseline tracker and caniuse data:

• Chrome shipped unprefixed backdrop-filter starting at Chrome 76, released July 2019
• Firefox added unprefixed support later, in Firefox 103, released July 26, 2022
• Safari dropped its -webkit- prefix requirement at Safari 18, released September 16, 2024
• backdrop-filter reached Baseline "Newly Available" status on September 16, 2024, with "Widely Available" status expected by March 16, 2027

Internet Explorer never added the property at all, which only matters if your traffic still includes it.

Safari's WebKit Prefix Requirement

Older Safari and older iOS WebViews still need the -webkit- prefix even after Safari 18's release. Keep both lines in the CSS rather than only the unprefixed version.

Drop the prefix entirely and pre-2024 Safari visitors get no blur at all, just whatever fallback background color you set.

When Does Glassmorphism Not Work?

Glassmorphism fails most often on contrast, not on code. If text on a glass panel can't be read against a blurred, busy background, the effect works against usability.

Contrast and Accessibility Limits

The Web Content Accessibility Guidelines set a minimum color contrast ratio of 4.5:1 for normal body text. A translucent panel sitting over a busy photo blows past that limit quickly, especially with light text on a light, blurred background.

Running the glass and text colors through an accessible color palette generator before shipping catches this earlier than eyeballing it on one monitor.

Common ways this breaks in practice:

• Low-contrast text: white text on a light, blurred background disappears within seconds of scrolling past a bright section
• Text-dense interfaces: dashboards and data tables lose more from unreadable rows than they gain from the aesthetic
• Older browsers: pre-2022 Firefox and unprefixed rules in pre-2024 Safari render a flat, unblurred panel that changes the whole visual balance of the page

Performance Cost on Mobile Devices

Backdrop-filter is not free to render. Every blurred panel forces the browser to repaint the layer beneath it, and stacking several glass panels on one screen compounds that cost.

Budget Android phones with weaker GPUs feel this first, usually as dropped frames during scroll rather than a visible glitch. One glass panel rarely causes trouble.

Five or six stacked on a single dashboard, refreshing on scroll, is a different story.

Which CSS Glassmorphism Generator Tool Should You Use?

Three real paths exist here: a dedicated generator like glassmorphism.com, a lighter alternative like css.glass, or hand-coding the four properties yourself. This page sits in the second group.

glassmorphism.com puts its own reach at 250,000 users across 137 countries, by the site's own usage numbers. That says something about how often people reach for a generator instead of writing the values from scratch.

Tool	Customization Range	Output Format	Price
glassmorphism.com	Blur, opacity, radius, background presets	Raw CSS	Free
css.glass	Blur, opacity, border, saturation	Raw CSS	Free
This generator	Blur, transparency, outline, saturation, 3 presets	Raw CSS	Free
Hand-coded	Unlimited, manual tuning	Any format you write	Free (time cost)

If you want to see the range of looks before touching a slider, a gallery of hand-styled CSS glassmorphism examples is faster to scroll through than trial and error inside a generator.

None of the three nail every corner-radius look straight out of the box. Pairing the exported code with a dedicated CSS border radius generator for final polish is common practice.

Microsoft runs a related idea under a different name. Windows 11's Fluent Design system uses an acrylic material for the same translucent, layered look, just tuned for a different operating system.

Should You Export Raw CSS, SCSS, or Tailwind Classes?

The right export format depends on your stack, not on which one looks more advanced. Raw CSS fits any project. SCSS suits teams already on a preprocessor, and Tailwind classes fit projects already built around utility-first styling.

Raw CSS

Most portable option: paste the exported code straight into a stylesheet and it works, no build step and no dependency.

Run it through a CSS minifier before shipping to production if file size on the page matters.

• Works well when: the project has no build pipeline, or the glass effect only appears on one or two elements
• Adds friction when: the same values need repeating across a dozen components, since there's no variable reuse

SCSS

• Works well when: the project already compiles Sass, and glass panels appear repeatedly with slight variations
• Adds friction when: the project has no build step, since adding one just for variables is overkill

SCSS variables and mixins turn the four glass properties into a single reusable block. Changing the blur radius site-wide then means editing one line instead of a dozen.

That reuse is the entire argument for choosing SCSS over raw CSS here.

Tailwind CSS

If the project already leans on Tailwind's utility classes, translating blur and opacity values into Tailwind's backdrop-blur and arbitrary-value syntax keeps everything in one system instead of splitting styles across two.

• Works well when: the rest of the interface is already built in Tailwind utility classes
• Adds friction when: the blur or opacity value doesn't map cleanly to Tailwind's default scale, forcing arbitrary values like backdrop-blur-[14px]

Mixing plain CSS and Tailwind classes for the same component tends to get messy fast. Pick one export format per component and stay with it.

How Do You Build a Glassmorphism Effect Step by Step?

Building the effect follows the same order every time: background first, then the four glass properties, then a browser fallback.

This assumes basic familiarity with CSS syntax rather than teaching it from scratch.

• Step 1: Place a gradient or image background on the parent element or the page itself
• Step 2: Position the glass container so it sits above that background, using relative or absolute positioning
• Step 3: Add backdrop-filter with a blur value, paired with -webkit-backdrop-filter for older Safari
• Step 4: Set background-color to a translucent rgba or hsla value so light passes through
• Step 5: Add a light, semi-transparent border and a soft box-shadow
• Step 6: Wrap an opaque fallback background in an @supports block for browsers without backdrop-filter

Steps three to six, with the generator's default values, look like this:

.glass-panel {
  background: rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(10px) saturate(180%);
  -webkit-backdrop-filter: blur(10px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 16px;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

@supports not (backdrop-filter: blur(1px)) {
  .glass-panel {
    background: rgba(255, 255, 255, 0.85);
  }
}

One extra step matters after those six: test the panel at a few breakpoints using media queries. A blur radius that looks right on desktop often reads as too heavy on a small screen.

Nothing in this sequence changes if you're using a generator instead of hand-coding it. The tool above does steps three through five for you and hands back the finished block. Steps one, two, and six stay with you.

How Do You Customize Blur, Transparency, Border, and Shadow Values?

Four values decide whether a glass panel looks polished or messy: blur radius, background alpha, border opacity, and corner radius.

Property	Typical Range	Common Default
Blur radius	5px to 20px	10px to 16px
Background alpha	0.1 to 0.3	0.15 to 0.2
Border opacity	0.2 to 0.4, white	0.3
Corner radius	8px to 24px	12px to 16px

Defaults vary between tools. CSSPortal's generator starts close to blur(10px) with roughly 20% opacity, which reads as subtle on a busy photo background. This one starts at blur(10px) with 30% opacity and saturate(180%).

Saturation and brightness: backdrop-filter accepts more than a blur function. saturate() or brightness() often ride alongside it to punch up the colors bleeding through the glass.

A dedicated color filter generator is a faster way to dial in saturate and brightness values than typing numbers blind.

Color function choice: rgba() is the default in most generators. hsla() reads more intuitively once you're already thinking in hue and lightness rather than red, green, and blue channels.

Converting a hex brand color into hue-based values first, through an HSL to RGB converter, makes that switch easier.

None of these values blur anything by default. The Filter Effects Module spec sets backdrop-filter's initial value to none, so a panel stays sharp until a filter function is written in explicitly.

What Common Mistakes Break a Glassmorphism Effect?

Four repeatable mistakes cause most glassmorphism failures, and none of them are about bad taste.

Mistake	Fix
Forgetting the -webkit- prefix	Pair backdrop-filter with -webkit-backdrop-filter on every rule
No fallback for unsupported browsers	Wrap an opaque background in @supports not (backdrop-filter: blur(1px))
Using a JavaScript polyfill	Fall back to a static background image instead
Placing glass over a flat background	Add a gradient or photo behind the panel first

Google's own web.dev article on backdrop-filter recommends that exact third fix: fall back to a plain image rather than a JavaScript polyfill. A polyfill adds real runtime cost for what is a purely decorative effect.

Skipping that fallback doesn't just look worse on old browsers. It quietly breaks web accessibility for anyone still running a pre-2022 Firefox build or an older WebView.

A newer mistake has shown up since 2025: confusing this generator's output with Apple's Liquid Glass. Apple introduced that refraction and motion-based material at WWDC on June 9, 2025, shipping it across iOS 26 and macOS Tahoe 26.

Four static CSS properties can't reproduce real-time refraction or touch response. That depends on native rendering, not backdrop-filter alone, so don't promise a client "Liquid Glass" when the deliverable is a CSS glassmorphism panel.

If a mistake is hard to spot in minified generator output, running the code through a CSS beautifier first makes the four properties easier to scan line by line.

FAQ on CSS Glassmorphism Generators

Where does the glassmorphism design trend come from?

The term traces to Michal Malewicz's November 2020 article at Hype4.Academy, which grouped scattered frosted-glass interfaces under one shared name. The visual style predates the label. It appeared in translucent operating system panels before backdrop-filter existed as CSS.

Is glassmorphism the same as neumorphism?

No, they run on opposite visual logic. Glassmorphism relies on transparency and blur, layering a see-through panel over a busy gradient background. Neumorphism uses soft, matching-color shadows on a solid surface to make elements look extruded or pressed in.

Do you need JavaScript to build a glassmorphism effect?

No. The effect runs entirely on backdrop-filter, background-color, border, and box-shadow, four CSS properties with no scripting involved. JavaScript only enters the picture for toggling themes, animating blur on scroll, or running a generator's own slider interface.

How much does a CSS glassmorphism generator cost?

Every generator covered here, this one, glassmorphism.com, and css.glass included, costs nothing to use. Paid alternatives mostly show up as bundled features inside larger UI kit subscriptions or Figma plugin marketplaces, not as standalone glass-effect tools.

Can you use a glassmorphism generator with React or Figma?

Yes, in different ways. A generator's CSS output drops into a React component's className or styled-components block with no conversion needed. Figma has no backdrop-filter property, so designers recreate it by learning to blur layers in Figma and stacking fills.

What tools help debug backdrop-filter rendering issues?

Browser DevTools' rendering panel shows whether a layer is actually compositing on the GPU or falling back to software painting. Toggling the backdrop-filter declaration off and on in the Styles panel isolates the property when a panel looks unexpectedly flat.

What Should You Fix First After Using a CSS Glassmorphism Generator?

A CSS glassmorphism generator's exported code needs contrast checked before blur radius or corner rounding. Unreadable text on a translucent panel breaks the page for real users, while a blur value a few pixels off only looks slightly unpolished.

Fixing order matters more than fixing everything at once.

• Contrast between text and glass panel
• Vendor prefix and browser fallback
• Blur radius and corner refinement

Backdrop-filter already appears on 35.7% of Chrome page loads as of September 2026, per Chrome Platform Status, even though Firefox only added unprefixed support in 2022. Most of that adoption happened within the last four years.

Once those three checks pass, the next natural stop is exploring CSS neumorphism for interfaces that need a heavier, more tactile alternative to translucent glass panels.