CSS Design Tool
CSS Glassmorphism UI Builder
Create modern glassmorphism cards and UI components visually, customize every detail, and generate ready-to-use HTML and CSS instantly.
- Live Preview
- CSS Generator
- Glass Effects
- Responsive
- Free
- No Signup
Controls
Component
Glass
Glass intensity
Glass presets
Background
Only http and https URLs are accepted.
Border & radius
Shadow & glow
Typography
Font stacks only — no external font is downloaded.
Size & spacing
Content
Leave blank to use initials.
Live preview
Generated code
Your design never leaves this browser. The autosave writes to your own local storage only — no account, no upload.
What Is Glassmorphism?
Glassmorphism is a UI style in which a panel looks like a sheet of frosted glass laid over the interface. It is built from five ingredients working together:
- Transparency — the surface is semi-transparent, usually
rgba()white or a dark tint, so the background shows through. - Background blur — whatever sits behind the panel is blurred with
backdrop-filter, which is what makes it read as glass rather than as a plain transparent box. - Soft borders — a hairline semi-transparent border catches the light along the panel edge.
- Shadows — a wide, soft drop shadow lifts the panel off the page, often with an inset highlight along the top edge.
- Layered backgrounds — a gradient or blurred colour shapes underneath give the blur something interesting to work with.
The property doing the real work is backdrop-filter: blur(). Unlike filter, which blurs
the element and everything inside it, backdrop-filter blurs only what is behind the element —
so your heading and body text stay perfectly sharp while the background melts away underneath them.
How to Create Glassmorphism with CSS
A complete glass card is about six declarations. This is what the builder generates:
.glass-card {
--glass-bg: rgba(255, 255, 255, 0.15);
--glass-blur: blur(20px) saturate(160%) brightness(110%);
--glass-border: 1px solid rgba(255, 255, 255, 0.26);
--glass-radius: 20px;
--glass-shadow: 0 8px 32px -4px rgba(11, 16, 32, 0.32),
inset 0 1px 0 0 rgba(255, 255, 255, 0.28);
background: var(--glass-bg);
-webkit-backdrop-filter: var(--glass-blur);
backdrop-filter: var(--glass-blur);
border: var(--glass-border);
border-radius: var(--glass-radius);
box-shadow: var(--glass-shadow);
}
The values are exposed as CSS custom properties so you can retune the whole surface from one place, or override them per theme without touching the rest of the rule.
One detail that catches people out: the effect is invisible without a varied backdrop. Put that card on a flat white page and a 20 pixel blur has nothing to blur. It needs a gradient, a photo, or overlapping colour shapes behind it.
CSS Property Guide
| Property | What it does | Typical value |
|---|---|---|
background | The tint of the glass itself. Needs an alpha channel or nothing shows through. | rgba(255,255,255,.15) |
backdrop-filter | Filters what is painted behind the element. The core of the effect. | blur(20px) |
-webkit-backdrop-filter | The prefixed form Safari still needs. Always ship both. | blur(20px) |
saturate() | Pushes colour back into the blurred backdrop, which blur tends to wash out. | saturate(160%) |
brightness() | Lifts or darkens the backdrop. Useful for dark glass over bright images. | brightness(110%) |
border | A hairline light edge that reads as the rim of the glass. | 1px solid rgba(255,255,255,.26) |
border-radius | Rounded corners. Glass almost never looks right with sharp corners. | 16px – 24px |
box-shadow | A wide soft shadow for lift, plus an optional inset top highlight. | 0 8px 32px rgba(0,0,0,.32) |
@supports | Detects missing backdrop-filter so you can raise the opacity instead. | @supports not (…) |
Glassmorphism vs Neumorphism
They are often mentioned together but they need opposite conditions to work.
Transparency plus a blurred backdrop. The panel floats above a colourful, layered background and borrows its colour. Needs a busy background to be visible at all, and depends on backdrop-filter.
Soft paired shadows — one light, one dark — on a surface the same colour as the page, so controls look extruded from it. Needs a plain background, and is notoriously hard to keep accessible because contrast is inherently low.
In short: glassmorphism adds depth by letting the background through; neumorphism fakes depth by sculpting a flat surface. If your page background is a flat neutral, glassmorphism has nothing to work with.
Glassmorphism Design Best Practices
Text sits on a moving background, so check the worst case — the lightest patch under white text. Raise the glass opacity rather than darkening the text.
Past roughly 40px the backdrop becomes flat colour and the depth cue disappears. 8–24px covers most designs.
Body copy needs more opacity behind it than a decorative panel does. Prefer a solid weight over a thin one at small sizes.
A 1px border at 20–35% opacity reads as glass. A bright 2px border reads as a plastic outline.
Gradients or a few large blurred colour shapes. A flat colour behind glass looks like a mistake.
Glass works as a focal surface. When every card is glass, nothing stands out and the page becomes noisy.
Backdrop blur is GPU work and is heavier on low-end phones. Preview at 390px and check scrolling stays smooth.
Where backdrop-filter is unsupported, raise the background opacity with @supports so text never loses contrast.
Use Cases
Glass stat panels over a subtle gradient give hierarchy without heavy borders.
A frosted hero card over a colourful gradient is the signature glassmorphism moment.
A single glass form over a photograph — one of the few places a full-bleed image works.
Glass makes the highlighted plan feel elevated without a loud border.
Avatar, name and role on frosted glass reads as modern and light.
A sticky translucent bar that blurs the content scrolling beneath it.
A blurred dialog over a dimmed backdrop keeps context visible behind the decision.
Glass controls over blurred album art is the pattern most streaming apps use.
Glass tiles over work thumbnails let the imagery lead while text stays legible.
Both iOS and Windows lean on translucency, so glass feels native in app-like web UI.
Frequently Asked Questions
What is glassmorphism?
Glassmorphism is a UI style where a panel looks like frosted glass. It combines a semi-transparent background, a blur applied to whatever sits behind the panel, a thin light border, a soft shadow and a colourful layered background. The blur of the backdrop is what separates it from plain transparency.
How do I create glassmorphism in CSS?
Give the element a semi-transparent background such as rgba(255, 255, 255, 0.15), add backdrop-filter: blur(20px) with the -webkit- prefixed version alongside it, add a 1px semi-transparent border, a border radius of roughly 16 to 24 pixels, and a soft box-shadow. The effect only shows when there is something varied behind the element.
What is backdrop-filter?
backdrop-filter applies a graphical effect to the area behind an element rather than to the element itself. filter blurs the element and its content; backdrop-filter blurs what shows through it, which is why the text on a glass card stays sharp while the background goes soft.
How does backdrop-filter blur work?
The browser samples the pixels painted behind the element, applies the filter to that sampled image, and paints the element's own semi-transparent background over the result. Because it works on the backdrop, the element needs some transparency for the effect to be visible at all.
What is the best blur value for glassmorphism?
Somewhere between 8px and 24px suits most designs. Below about 6px the effect barely reads; above roughly 40px the background turns into flat colour and you lose the sense of depth that made the effect worth using. Pair a higher blur with lower background opacity.
How do I make a glass card in CSS?
Set background to rgba(255, 255, 255, 0.15), backdrop-filter and -webkit-backdrop-filter to blur(20px) saturate(160%), border to 1px solid rgba(255, 255, 255, 0.26), border-radius to 20px and box-shadow to 0 8px 32px rgba(11, 16, 32, 0.32). Place it over a gradient. This builder generates exactly that, with your own values.
Can I generate HTML and CSS?
Yes. The code panel shows semantic HTML and the matching CSS, both regenerated on every change. You can copy either one, copy both together, or download a standalone HTML file that renders the component on its own.
Does the generator work on mobile?
Yes. On narrow screens the three-column studio becomes Controls, Preview and Code tabs, and the control groups collapse into sections so the preview stays large enough to judge the effect.
Can I customize transparency?
Yes. The glass colour and its opacity are separate controls, so you can build a white frost, a dark smoked glass or a coloured tint. The opacity slider runs from 0 to 100 percent and the generated rgba() value updates live.
Can I change the background behind the glass?
Yes. Choose a linear or radial gradient with two or three colours, a solid colour, or an image URL, and add blurred decorative blobs. Nine background presets are included. The background stays preview-only unless you tick Include background in export.
Can I create glass buttons?
Yes. Select Button as the component and the generated CSS includes a hover state that lifts the button and increases its background opacity, an active state and a :focus-visible outline, so it is usable rather than decorative.
Can I create glass navigation bars?
Yes. The navbar component generates a semantic nav element with a logo link, a menu list and a call-to-action button, plus a media query that stacks the bar on screens under 640 pixels.
Does glassmorphism work in all browsers?
backdrop-filter is supported in current Chrome, Edge, Firefox and Safari, with Safari needing the -webkit- prefix that this tool always emits. Older browsers ignore it and show the semi-transparent background without any blur, so the panel is still readable but is not the same effect.
What fallback should I use for backdrop-filter?
Raise the background opacity so the text keeps its contrast without the blur. The generated CSS does this automatically with an @supports not query that sets a more opaque background only when neither backdrop-filter nor -webkit-backdrop-filter is supported.
Is this CSS generator free?
Yes. It is free, needs no account, and has no export limits or watermarks.
Can I use the generated CSS commercially?
Yes. The output is ordinary CSS built from the values you chose. Use it in personal, client or commercial work with no attribution required.
What is the difference between glassmorphism and neumorphism?
Glassmorphism uses transparency and a blurred backdrop so the element floats above a colourful background. Neumorphism uses a background-matched surface with paired light and dark shadows so controls look extruded from the page. Glassmorphism needs a busy background; neumorphism needs a plain one.
Why can I not see the glass effect?
Almost always because there is nothing varied behind the element. On a flat background a blur has nothing to blur. Check also that the background is semi-transparent rather than solid, and that no parent has overflow or filter set in a way that creates a new stacking context around the element.
Does glassmorphism hurt performance?
backdrop-filter is GPU work and re-evaluates when the content behind it moves, so a handful of glass panels is fine while dozens over a scrolling or animating background can cost frames on low-end devices. Use it for a few focal surfaces rather than every card.
Is my design uploaded anywhere?
No. The builder runs entirely in your browser. The autosave writes to your own browser storage only, and no design or image URL is sent to a server.