CSS Glassmorphism Generator - Create Frosted Glass Effects Online
Generate beautiful frosted glass CSS effects with live preview. Customize blur, transparency, borders, and shadows for glassmorphism design.
Frequently Asked Questions
What is Glassmorphism?
Glassmorphism is a modern UI design trend that creates a frosted glass effect using translucent backgrounds, background blur, and subtle borders. Popularized by Apple's macOS Big Sur and Windows 11 Fluent Design, it gives elements a sense of depth and layering by allowing background content to show through with a soft, blurred appearance. The effect is achieved primarily through CSS properties like backdrop-filter, semi-transparent backgrounds, and thin light borders.
How do I use this Glassmorphism generator?
Adjust the blur intensity slider to control the frosted glass effect, then set the background color and its opacity using the color picker and slider. Enable or disable the border and box-shadow, and fine-tune their parameters such as width, color, opacity, and radius. The live preview updates in real time so you can see the exact result. Once satisfied, copy the generated CSS code directly into your stylesheet.
Is my data secure? Does anything get sent to a server?
Yes, your data is completely secure. This tool runs 100% in your browser using client-side JavaScript — no data, configurations, or design settings are ever sent to any server. All CSS generation, preview rendering, and color calculations happen locally on your device, making it safe for confidential design work and client projects.
What is backdrop-filter and how does it work?
The CSS backdrop-filter property applies graphical effects such as blur, brightness, or contrast to the area behind an element. Unlike the filter property which affects the element itself, backdrop-filter only affects what is visible through the element's transparent or semi-transparent background. For glassmorphism, backdrop-filter: blur() is the key property that creates the frosted glass appearance by blurring the content beneath the panel.
What browsers support glassmorphism / backdrop-filter?
The backdrop-filter property is supported by over 95% of browsers globally, including Chrome 76+, Firefox 103+, Safari 9+, and Edge 79+. Safari was actually the first major browser to implement it with the -webkit- prefix. For maximum compatibility, it is recommended to include both the -webkit-backdrop-filter and backdrop-filter declarations, which this generator does automatically.
How does glassmorphism affect performance?
Backdrop-filter blur triggers GPU compositing, which can impact performance if overused. Each blurred element creates a separate compositing layer that the browser must render independently. To maintain smooth performance, limit the number of simultaneously visible glass elements, use moderate blur values (8-20px), avoid nesting glassmorphic elements, and ensure the blurred area does not cover excessively large portions of the viewport.
How do I ensure text is readable on a glass panel?
To meet WCAG accessibility guidelines, ensure sufficient contrast between text and the glass background. Increase the background opacity (0.3-0.5) for better contrast, use a higher blur value so underlying content is less distracting, and add a subtle border to define panel edges. Consider using darker text on light glass panels and lighter text on dark glass panels, and always test readability against various background images and colors.
Code Examples
function hexToRgba(hex, opacity) {
const r = parseInt(hex.slice(1, 3), 16);
const g = parseInt(hex.slice(3, 5), 16);
const b = parseInt(hex.slice(5, 7), 16);
return `rgba(${r}, ${g}, ${b}, ${opacity})`;
}
function generateGlassmorphismCSS(options = {}) {
const {
blur = 10,
bgColor = '#ffffff',
bgOpacity = 0.15,
borderEnabled = true,
borderWidth = 1,
borderColor = '#ffffff',
borderOpacity = 0.2,
borderRadius = 12,
shadowEnabled = true,
shadowX = 0,
shadowY = 4,
shadowBlur = 30,
shadowSpread = 0,
shadowColor = '#000000',
shadowOpacity = 0.1,
} = options;
const rules = [];
rules.push(`background: ${hexToRgba(bgColor, bgOpacity)};`);
rules.push(`-webkit-backdrop-filter: blur(${blur}px);`);
rules.push(`backdrop-filter: blur(${blur}px);`);
if (borderRadius > 0) {
rules.push(`border-radius: ${borderRadius}px;`);
}
if (borderEnabled && borderWidth > 0) {
rules.push(`border: ${borderWidth}px solid ${hexToRgba(borderColor, borderOpacity)};`);
}
if (shadowEnabled) {
rules.push(`box-shadow: ${shadowX}px ${shadowY}px ${shadowBlur}px ${shadowSpread}px ${hexToRgba(shadowColor, shadowOpacity)};`);
}
return rules.join('\n');
}
console.log(generateGlassmorphismCSS());
// background: rgba(255, 255, 255, 0.15);
// -webkit-backdrop-filter: blur(10px);
// backdrop-filter: blur(10px);
// border-radius: 12px;
// border: 1px solid rgba(255, 255, 255, 0.2);
// box-shadow: 0px 4px 30px 0px rgba(0, 0, 0, 0.1);