Generate frosted glass CSS effects online free with a live preview. Adjust blur, background opacity, and border opacity to create white-tinted glassmorphism UI cards and panels - no box-shadow, background color, or border color controls.
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Glassmorphism requires specific combinations of backdrop-filter, background-color with alpha, and border properties to look right. Getting the blur and transparency balance right without a visual preview requires tedious trial-and-error.
Adjust blur, background opacity, border opacity, and border radius on a live glass card preview, then copy the finished CSS. The card's background and border color are both fixed to white (only their opacity is adjustable), and the preview's colorful backdrop is fixed too - neither is a control you can change.
Set backdrop blur, background opacity, border opacity, and border radius.
See the glassmorphism effect render on a card in real time.
Only their opacity is adjustable - add your own color, tint, or shadow in your stylesheet if needed.
Copy the complete CSS snippet - background, backdrop-filter (with the Safari prefix), border, and border-radius.
Set Blur, Opacity, Border Opacity, and Border Radius while watching the live glass-card preview update.
The card's background and border are always white - only their opacity changes. The preview's colorful backdrop is fixed too.
Copy gives you background, backdrop-filter, -webkit-backdrop-filter, border, and border-radius - five declarations, no box-shadow.
Paste the glass card onto your own colorful or image background, and add a box-shadow yourself if you want one - neither is generated here.
Best For
Input
Any slider configurationResult
background: rgba(255,255,255,0.2); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border: 1px solid rgba(255,255,255,0.2); border-radius: 16px;Five declarations, always in this order - box-shadow is never part of the output, regardless of the slider values.
Input
Opacity: 40, Border Opacity: 60Result
background: rgba(255,255,255,0.4); border: 1px solid rgba(255,255,255,0.6);Only the alpha channel changes - there's no control anywhere in the tool to change the background or border hue away from white.
Input
Any slider configurationResult
The preview always sits on the same purple-to-pink gradientThere's no color picker or gradient control for the backdrop the glass card previews against - it's hardcoded in the page.
Adjust the sliders and watch the live preview instead of guessing rgba and blur values.
Copy once and get both the prefixed and unprefixed backdrop-filter declarations.
Use this as a starting point, then edit the background color, add a shadow, or change the border color yourself in your own stylesheet.
Problem
Solution
Both are fixed to white - only their opacity is adjustable. Edit the color manually in your own CSS if you need a tinted glass effect.
Problem
Solution
It's never included - add one yourself in your stylesheet if you want elevation on top of the glass effect.
Problem
Solution
The gradient behind the glass card in the preview is fixed - it's not a real control, just a demo background.
Problem
Solution
backdrop-filter blurs whatever is behind the element - on a plain white background, a white-tinted glass card will be nearly invisible. Use a colorful or image background.
A higher background opacity makes the white tint more visible against busy backgrounds.
backdrop-filter needs something behind it to blur - a plain white page won't show the effect.
This tool doesn't generate one - a subtle shadow often helps a glass card read as a distinct layer.
Swap rgba(255,255,255,...) for your own color in the copied CSS - the tool itself only adjusts opacity.
Both are fixed to white - only opacity/alpha is adjustable via the sliders.
The output never includes a shadow declaration - add one manually if needed.
Only Blur, Opacity, Border Opacity, and Border Radius are adjustable - there's no way to add a tint, noise texture, or a custom gradient background from within the tool.
There's no one-click starting-point preset - every value is set from scratch via the four sliders.
Only a Copy button exists - no file export, no format switcher (Tailwind/SCSS/CSS variables), and no reset-to-default.
The gradient the glass card previews against is hardcoded and can't be changed in the tool.
Both build a frosted-glass CSS block, but only one lets you change the glass color.
| This Tool (White Glass Only) | A Tint-and-Preset Generator | |
|---|---|---|
| Background/border color | Fixed to white - opacity only | Usually a full color picker |
| Box-shadow | Not generated | Often included |
| Presets | None | Often included |
The most common question is about browser support. The backdrop-filter property that creates the blur effect requires -webkit-backdrop-filter for Safari. Chrome, Edge, and Firefox support it without prefix. This tool's own output always includes both the prefixed and unprefixed versions.
No. This tool's background and border are both fixed to white - only their opacity is adjustable, and box-shadow is never part of the generated CSS. If you need a tinted glass effect or a shadow, add them yourself to the copied CSS.
Glassmorphism is a design trend where UI elements (cards, panels, modals) appear as frosted glass - semi-transparent with a blurred background visible through the element, a subtle border, and soft shadows. Popularized in Apple's macOS Big Sur (2020) and widely adopted in web design. It creates depth and hierarchy by layering elements with varying levels of transparency against colorful or image backgrounds.
Three properties are essential: background: rgba(255,255,255,0.15) - semi-transparent white background. backdrop-filter: blur(12px) - blurs everything behind the element. border: 1px solid rgba(255,255,255,0.3) - subtle white border for the glass edge. Usually combined with box-shadow for depth. The -webkit-backdrop-filter property is needed for Safari compatibility. This tool's own output matches the first three properties exactly (always white-based) but never adds a box-shadow.
backdrop-filter is supported in Chrome 76+, Edge 17+, Safari 9+, and Firefox 103+ (though Firefox required enabling a flag until 103). Safari requires -webkit-backdrop-filter as a fallback. Mobile browsers: iOS Safari 9+ and Chrome for Android both support it. For production use, include both prefixed and unprefixed versions: -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px); - this tool's own output already includes both lines.
backdrop-filter only works when there is content behind the element. A white page background produces a white blur - the effect is invisible. backdrop-filter requires a colorful or image background behind the element to look like glass. Also verify: the element must have a semi-transparent background (rgba with alpha < 1, not a solid color). If using backdrop-filter on a child element, the parent must not have overflow: hidden.
Yes - semi-transparent backgrounds reduce the contrast between text and its background, potentially failing WCAG contrast ratio requirements (4.5:1 for normal text). The blurred background content behind glass elements can create visual confusion for users with cognitive disabilities. Best practice: ensure text on glass elements meets contrast requirements against the darkest background color that could show through, and don't rely solely on the glass effect to convey information. This tool has no built-in contrast checking - verify manually.
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