Glassmorphism CSS Generator
Tune blur, transparency, border, and shadow to generate the CSS for a glassmorphism card. Live preview over a gradient background, copy in one click. Runs entirely in your browser.
About this tool
The Glassmorphism CSS Generator lets you build the CSS for a frosted-glass UI card in real time. Adjust the blur, background transparency, border, and shadow, then copy the finished CSS straight into your stylesheet.
What is glassmorphism? It is a design trend popularised around 2020-2021 that creates a semi-transparent,
frosted-glass look using the CSS backdrop-filter property. The key ingredient is
backdrop-filter: blur(), which blurs everything rendered behind the element.
Combine it with a low-opacity background colour, a subtle border, and a light box-shadow and you get the characteristic glass effect.
Browser support. backdrop-filter is well supported in Chrome, Edge, Safari 9+, and Firefox 103+.
Older Internet Explorer versions and very old Safari releases do not support it at all -- the element simply renders as
a plain semi-transparent box. Always include the -webkit-backdrop-filter prefix for Safari compatibility,
which this tool outputs automatically.
When to use it. Glassmorphism works best as an accent -- for modals, cards, navigation bars, or hero overlays placed in front of a rich, colourful background (a gradient, a photo, or abstract art). Overusing it across an entire UI creates visual noise and can hurt readability. Keep text contrast high (WCAG AA or better) when using a translucent background.
Performance note. backdrop-filter is GPU-accelerated in modern browsers but can be expensive
on low-end devices if applied to many overlapping elements simultaneously. Use it sparingly on mobile layouts.
