CSS Glassmorphism Generator: Frosted UI Code

Want that frosted glass look where a card blurs whatever sits behind it? The CSS Glassmorphism Generator builds that effect for you with four simple controls. You move a few sliders, pick a tint, and copy the code.

It is made for front-end developers, UI designers, and students learning modern CSS. You set the blur, opacity, border, and color, then paste the result into your stylesheet. The preview updates as you drag each slider.

Table of Contents

• What the Tool Does
• How to Use It, Step by Step
• How the CSS Is Built
• Worked Example
• How to Read the Output
• Tips for a Clean Glass Effect
• Limitations and Assumptions
• FAQs About the CSS Glassmorphism Generator

What the Tool Does

The tool writes a small block of CSS for one frosted glass card. Four controls feed the preview and the output box. You never type any code yourself.

• Backdrop Blur (px): a slider from 0 to 30 that sets how much the background blurs.
• Surface Opacity %: a slider from 0 to 100 that sets the fill opacity of the card.
• Border Opacity %: a slider from 0 to 100 that sets how visible the thin edge is.
• Color Tint: a color picker that chooses the glass color, with white as the default.
• Generated CSS Code: a read-only box holding five CSS lines you can copy.
• Copy CSS: a button that sends the code to your clipboard.

Three small cards at the top show your current blur, opacity, and border values. They mirror the sliders as you move them.

How to Use It, Step by Step

1. Drag Backdrop Blur (px) to set the blur strength. The default is 10 pixels.
2. Drag Surface Opacity % to set the fill opacity. The default is 25 percent.
3. Drag Border Opacity % to set the edge strength. The default is 30 percent.
4. Click Color Tint and choose a glass color. The default is white.
5. Watch the live card on the right update with each change.
6. Click Copy CSS and paste the code into your stylesheet.

How the CSS Is Built

The tool turns your hex color into red, green, and blue numbers. It then divides each percent by 100 to get an alpha value with two decimals. Those pieces go into a fixed template of five CSS lines.

• Fill color = rgba(red, green, blue, opacity), where opacity = the opacity percent divided by 100.
• Border = 1px solid rgba with the same color and border percent divided by 100.
• Blur = backdrop-filter: blur(value px), with a webkit prefix line for Safari.
• A fixed box-shadow of rgba(0, 0, 0, 0.2) is added for depth.

The box-shadow value never changes. Only the color, the two alpha numbers, and the blur come from your sliders.

Worked Example

Start with the default settings: blur 10, opacity 25, border 30, and a white tint. White is hex ffffff, which is red 255, green 255, and blue 255.

Now try a tinted card. Priya builds a login panel over a photo. She sets blur 16, opacity 40, border 50, and a light blue tint of a5d8ff.

That hex reads as red 165, green 216, and blue 255. The fill becomes rgba(165, 216, 255, 0.40) and the border becomes 1px solid rgba(165, 216, 255, 0.50). The two blur lines both read blur(16px).

How to Read the Output

background is the glass fill. A low opacity lets more of the backdrop show through the card.

backdrop-filter and its webkit twin create the actual blur. The element behind the card must be visible for the blur to appear.

border adds a faint edge that catches light, which sells the glass look. The box-shadow lifts the card off the page with a soft drop shadow.

The three cards up top restate your blur, opacity, and border numbers. They are a quick summary, not extra settings.

Tips for a Clean Glass Effect

Glassmorphism only works over something with contrast. Place the card on a photo or a colorful CSS gradient background so the blur has content to soften.

Keep text readable. A heavy blur with low opacity can wash out labels, so test real copy inside the card. A quick text contrast check helps you keep words legible.

For a softer, extruded look instead of glass, try the soft neumorphism effect builder. To fine-tune the drop shadow this tool sets for you, open the box shadow code generator.

Need exact red, green, and blue numbers from a hex value? The hex to RGB converter shows them clearly. More utilities live in the developer tools hub.

Limitations and Assumptions

• The Surface Opacity slider raises the fill opacity. A higher value makes the glass more solid, not more see-through.
• There is no blend mode control. The tool sets blur, surface opacity, border opacity, and a color tint only.
• Border radius is not adjustable. The box-shadow is locked at rgba(0, 0, 0, 0.2) and cannot be changed in the tool.
• The blur, opacity, and border ranges are fixed. You cannot set a value above the slider maximum.
• The backdrop-filter effect needs modern browser support and a visible background behind the card.

FAQs About the CSS Glassmorphism Generator

This calculator gives general estimates only and is not professional advice. Reviewed for general accuracy by Prof. Dr. Khalil Mudassar, PhD.