CSS Glassmorphism Generator

Glassmorphism is a UI design trend that creates a frosted glass appearance using CSS backdrop-filter with blur combined with a semi-transparent background color. The blur makes content behind the element appear soft and diffused while the transparent background adds a color tint. Popularized by Apple's macOS Big Sur and Windows 11 Fluent Design, glassmorphism creates depth and visual hierarchy by letting background elements show through partially. The key CSS properties are backdrop-filter: blur(), background: rgba(), and typically a subtle border to enhance the glass edge.

Backdrop-filter is supported in Chrome 76 and later, Safari 9 and later (with -webkit prefix), Edge 79 and later, Firefox 103 and later, and all modern mobile browsers. Safari requires the -webkit-backdrop-filter prefix which this generator includes automatically. The only notable gap is older Firefox versions before 103 and Internet Explorer which has no support. For unsupported browsers, the semi-transparent background color still provides a tinted overlay effect, just without the blur. Overall browser support is above 95 percent of global users as of 2026.

The CSS filter property applies visual effects like blur to the element itself and its children. Backdrop-filter applies the same effects only to the area behind the element, leaving the element content sharp and readable. This is what creates the glassmorphism effect: text on the glass card stays crisp while the background behind it appears blurred. If you used filter: blur() instead, the text inside the card would also become blurry and unreadable. Backdrop-filter essentially creates a window effect where you are looking through frosted glass.

Effective glassmorphism needs a colorful or detailed background to make the blur visible. A solid white background behind glass looks identical to a regular card. Use blur values between 8 and 20 pixels for most cases. Keep background opacity between 10 and 30 percent so content behind remains partially visible. Add a subtle light border at 10 to 30 percent white opacity to enhance the glass edge. Avoid stacking multiple glass layers as each backdrop-filter compounds performance cost. Ensure text contrast meets accessibility standards since semi-transparent backgrounds can reduce readability.