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Glassmorphism CSS Generator — Frosted Glass Effect

Build frosted-glass CSS with live preview over a gradient. Blur 0–40px, tint, border and shadow. Emits the -webkit- prefix Safari still needs.

No limitsZero data leaksSuper fast
12px
0.15
16px
Glass card
background: rgba(255, 255, 255, 0.15);
backdrop-filter: blur(12px);
-webkit-backdrop-filter: blur(12px);
border-radius: 16px;
border: 1px solid rgba(255, 255, 255, 0.30);
box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);

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About this tool

Frosted glass needs something behind it to blur

Apply backdrop-filter: blur() to an element on a flat white background, and the effect vanishes entirely — there's nothing to blur. The CSS property works by blurring the pixels behind the element. If that backdrop is flat color, blurred and unblurred look identical. Many developers test glassmorphism on a local white page, confirm it looks right, build it into production, then watch it disappear once users view it on a colorful background or image.

This tool previews the effect against a gradient so you see what you're building

The preview is a vibrant linear gradient so you get real-time feedback on how the glass card looks when there's actually something to blur. Adjust blur (0–40px), opacity (0–1.0), tint color, and border-radius (0–48px) and watch the preview update instantly. The generated CSS includes background: rgba(...) for the tint color, -webkit-backdrop-filter: blur(...) for Safari, and an optional border with slightly higher opacity than the background, plus box-shadow: 0 8px 32px rgba(0,0,0,0.2) for depth.

Safari requires the webkit prefix, but older browsers don't support backdrop-filter at all

Both backdrop-filter: blur() and -webkit-backdrop-filter: blur() must be present for full browser coverage. However, browsers older than Safari 9 and some older Android versions lack support entirely. Those users will see either a solid color, transparent glass, or no effect at all, depending on your CSS fallback. This tool emits both properties in the output. You must decide what old browsers should display — typically a solid background color that's readable and maintainable.

Large blurred surfaces drain GPU and battery on mobile devices

Blur is computationally expensive, especially on mobile. A full-screen blurred background can cause frame drops or significant battery drain. The safer approach is to limit blur effects to small UI elements: cards, buttons, modals, and overlay components. This tool is calibrated for those use cases. Avoid blurring large surfaces, or implement a static blurred background image as a fallback for low-end devices.

See also the Gradient Text Generator and the CSS Animation Generator.

How to use the Glassmorphism Generator

Takes about a minute. No signup, no download, your data stays in your browser.

  1. 1
    Open the tool. Scroll up to the Glassmorphism Generator above — it loads instantly in your browser, no install needed.
  2. 2
    Enter your values. The fields come pre-filled with realistic defaults so you can see how it works — replace them with your own numbers.
  3. 3
    Read the result. The output updates instantly. Copy or share it — nothing is uploaded to a server, everything stays on your device.

Frequently asked questions

Common questions about the Glassmorphism Generator.

Why does my glassmorphism effect look invisible?

Because there is nothing behind the element to blur. backdrop-filter blurs the pixels behind an element, so on a flat white or solid-color background the blurred and unblurred results are identical. Place the glass card over a gradient, photo, or patterned background to see the effect.

Do I need the -webkit- prefix?

Yes, for Safari. The tool emits both backdrop-filter and -webkit-backdrop-filter in the output. Chrome, Edge and Firefox use the unprefixed property; Safari still needs the prefixed one, so both belong in your CSS.

What happens in browsers that do not support backdrop-filter at all?

They ignore the property entirely and render whatever background you set. Since the tool emits a semi-transparent rgba background alongside the blur, unsupported browsers show a plain translucent panel rather than nothing. Decide whether that is readable in your design and add a solid fallback colour if it is not.

Is it safe to blur a full-screen background?

It is expensive. Blur is computed per frame and large surfaces can cause frame drops and noticeable battery drain on mobile. Keep blur to cards, modals, navigation bars and overlays. For a full-screen effect, use a pre-blurred static image instead.

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