🧊 CSS Glassmorphism Generator
By ToolNimba Web Dev Team · Updated 2026-06-19
Drag the sliders or pick a color. The preview and CSS update live.
Glassmorphism is the frosted-glass look: a translucent, blurred panel that lets a colorful background bleed softly through it. This generator lets you dial in the blur, transparency, tint color, border and shadow, watch a live glass card update over a vivid backdrop, and copy clean, ready-to-paste CSS. The whole effect leans on the backdrop-filter property, plus a semi-transparent background and a faint light border that catches the eye like a glass edge.
What is the Glassmorphism Generator?
Glassmorphism became popular around 2020 and is built from three ingredients working together. First, a background color with low opacity, written as an rgba value, so the panel is see-through. Second, backdrop-filter: blur(), which blurs whatever sits behind the panel rather than the panel content itself, creating the frosted texture. Third, a thin, nearly-white, semi-transparent border (often with a soft drop shadow) that reads as the lit edge of a piece of glass. Remove any one of these and the illusion falls apart.
The key property, backdrop-filter, only does anything when there is something visually busy behind the element to blur, such as a gradient, photo or overlapping shapes. Over a flat, solid background you will see the tint but no frosting, because there is nothing varied to soften. That is why this tool previews your card over a colorful gradient: it is the only way to judge the effect honestly. A saturate() value is often added alongside blur() to keep the colors behind the glass from looking washed out.
Browser support is good in current versions of Chrome, Edge, Safari and Firefox, but you should still include the -webkit-backdrop-filter prefix for older WebKit-based browsers, which this generator outputs for you. Because backdrop-filter is GPU intensive, use it sparingly: a couple of glass panels are fine, but blurring dozens of overlapping elements can hurt performance on lower-powered devices. Always check contrast too, light text on a translucent panel can become hard to read depending on the background behind it.
When to use it
- Designing a frosted navigation bar or hero card that floats over a photo or gradient background.
- Building login modals, pricing cards or dashboard widgets in a modern glass UI style.
- Creating glass buttons and tooltips that sit on top of vivid imagery without hiding it.
- Prototyping a glassmorphism design quickly and exporting the exact CSS for your project.
How to use the Glassmorphism Generator
- Set the blur amount to control how frosted the glass looks.
- Adjust transparency (tint opacity) so the background shows through to the degree you want.
- Pick a tint color and a background color, then tune the border and shadow strength.
- Watch the live card update over the colorful backdrop, then copy the generated CSS.
Formula & method
Worked examples
A subtle white glass card with 10px blur, 20% tint opacity and a 30% border.
- Tint color white (255, 255, 255), opacity 20% gives background rgba(255, 255, 255, 0.2)
- Blur 10px and saturation 100% give backdrop-filter: blur(10px) saturate(100%)
- Border opacity 30% gives border: 1px solid rgba(255, 255, 255, 0.3)
- Shadow strength 25% gives box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.25)
Result: A soft frosted card: rgba(255,255,255,0.2) background with a 10px backdrop blur and faint light border.
A cooler, more saturated glass panel with 18px blur and a colored tint.
- Tint color light blue (148, 187, 233), opacity 15% gives background rgba(148, 187, 233, 0.15)
- Blur 18px and saturation 180% give backdrop-filter: blur(18px) saturate(180%)
- Border opacity 40% gives border: 1px solid rgba(255, 255, 255, 0.4)
- Shadow strength 35% gives box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.35)
Result: A vivid glass panel that keeps the colors behind it punchy thanks to the higher saturation.
Suggested glassmorphism settings by use case
| Use case | Blur | Tint opacity | Border opacity |
|---|---|---|---|
| Subtle card overlay | 6 to 10px | 15% to 25% | 20% to 30% |
| Strong frosted panel | 16 to 24px | 10% to 20% | 30% to 45% |
| Glass navigation bar | 10 to 16px | 30% to 50% | 15% to 25% |
| Glass button or tooltip | 4 to 8px | 20% to 35% | 30% to 50% |
CSS properties used in glassmorphism
| Property | Role |
|---|---|
| background (rgba) | Semi-transparent tint that lets the backdrop show through |
| backdrop-filter: blur() | Frosts whatever sits behind the element |
| backdrop-filter: saturate() | Keeps the colors behind the glass from looking washed out |
| border (rgba white) | Faint light edge that reads as a glass rim |
| box-shadow | Soft drop shadow that lifts the panel off the page |
Common mistakes to avoid
- Using a solid or flat background behind the glass. backdrop-filter only frosts content that sits behind the element. Over a flat color there is nothing varied to blur, so you see the tint but no glass effect. Place glass panels over gradients, photos or overlapping shapes.
- Forgetting the -webkit- prefix. Some WebKit-based browsers still need -webkit-backdrop-filter. Omitting it means the frosted effect silently fails for those users. This generator outputs both lines so you stay covered.
- Making the tint too opaque. If the background opacity is too high the panel becomes nearly solid and the see-through quality is lost. Keep tint opacity low (often 10% to 25%) and let the blur do the work.
- Ignoring text contrast. Light text on a translucent panel can fall below readable contrast depending on the background behind it. Test with real content and add a stronger tint or a text shadow if the text is hard to read.
Glossary
- Glassmorphism
- A UI style using translucent, blurred panels with a light border to mimic frosted glass.
- backdrop-filter
- A CSS property that applies graphic effects such as blur to the area behind an element, not its own content.
- rgba
- A color value with red, green and blue channels plus an alpha (opacity) channel from 0 (clear) to 1 (solid).
- Blur radius
- How far the backdrop blur spreads, in pixels. Higher values give a more heavily frosted look.
- Saturation
- A filter that boosts or reduces color intensity behind the glass, keeping colors lively at high blur.
Frequently asked questions
What is glassmorphism in CSS?
Glassmorphism is a design style that makes an element look like frosted glass: a translucent, blurred panel over a colorful background, with a faint light border. In CSS it is created with a semi-transparent rgba background, the backdrop-filter blur property and a thin white border.
How do I create a frosted glass effect in CSS?
Give the element a low-opacity rgba background, add backdrop-filter: blur() so the area behind it is frosted, then add a 1px nearly-white semi-transparent border and a soft box-shadow. This generator builds all of those lines for you as you adjust the sliders.
Why is my backdrop-filter not working?
The most common reason is that there is nothing colorful behind the element to blur, so a flat background shows no effect. Other causes are a missing -webkit-backdrop-filter prefix, an older browser, or a parent with overflow or filter rules that block it.
Do I need the -webkit-backdrop-filter prefix?
Yes, for the widest support. Some WebKit-based browsers still rely on the -webkit-backdrop-filter version, so this tool outputs both the standard property and the prefixed one to keep the effect working everywhere it can.
Is glassmorphism bad for performance?
backdrop-filter is GPU intensive, so a few glass panels are fine but blurring many overlapping elements can slow down lower-powered devices. Use it for key surfaces like cards, modals and navigation bars rather than across an entire page.
Does glassmorphism work in all browsers?
Current versions of Chrome, Edge, Safari and Firefox support backdrop-filter. Older browsers may not, in which case the panel falls back to its semi-transparent background without the frosting, so design it to still look acceptable without blur.