CSS Backdrop Filter Generator

The CSS backdrop filter generator pairs a blur radius with a saturation control and previews the frosted glass effect over a live background, then hands you the declaration.

What is CSS Backdrop Filter Generator?

• Two controls do the work: a blur radius in pixels, defaulting to twelve on a scale from zero to forty, and a saturation percentage defaulting to one hundred and twenty on a scale from zero to two hundred.
• Between them sits a live preview in which a translucent panel is laid over a coloured background, so the effect is visible as you drag rather than after a rebuild.
• Underneath, the tool emits the finished declaration with a copy button.

What separates backdrop-filter blur from an ordinary blur is what gets filtered. A regular blur applies to the element's own pixels and smears its content. A backdrop filter applies to whatever is painted behind the element, leaving the element itself sharp. That is why the effect behind frosted glass is the background becoming soft while any text on the glass stays crisp, and it explains the one requirement people most often miss: the element needs some transparency of its own, because an opaque surface hides the filtered backdrop entirely.

The saturation control is the part that turns a grey smear into glass. Blurring a background averages its colours, which tends to mute them, and a heavily blurred backdrop can look washed out and lifeless as a result. Pushing saturation above one hundred percent compensates by intensifying what remains visible behind the panel, so a backdrop filter with saturate above neutral keeps the colour underneath vivid rather than draining it. Dropping below one hundred percent does the opposite and is useful when the content on the glass needs to dominate.

In practice the workflow is to fix the background first and treat the panel as a layer over it, since the whole effect depends on what is behind. Then set the blur to taste: small radii give a subtle softening that reads as a tinted panel, while larger ones produce the unmistakable frosted glass look at the cost of hiding detail. Finally bring saturation in until the backdrop has some life left, checking that text on the panel is still readable against what shows through.

The uses are mostly overlays and chrome. A frosted glass css generator like this covers sticky headers that stay legible over scrolling content, modal dialogs and bottom sheets, media player controls, quick-look panels over a wallpaper, and navigation bars over hero images. The appeal in all of those cases is the same: the panel stays visually connected to what is behind it instead of cutting it off, while still separating itself enough to hold content.

There are a few limits worth knowing.

• The declaration filters the backdrop rather than the element, so it cannot blur an element's own content — that needs a different property.
• It does not create the tint either: the colour of the glass comes from a semi-transparent background of its own, which this tool does not set.
• Large blur radii can be expensive to composite, particularly on low-powered devices, so a generous value is worth testing on the hardware that matters.
• And no fallback is emitted, so a browser without support simply shows the unfiltered background.

Read it as a css backdrop filter generator for the two numbers that matter most: how much the backdrop blurs, and how much of its colour survives. Copy the declaration, add your own translucent background, and the effect is complete, which makes this a faster way to find the right blur and saturation values than editing a stylesheet and refreshing.

How to use CSS Backdrop Filter Generator

1. Set the blur radius with the first slider, from zero to forty pixels.
2. Set the saturation with the second slider, from zero to two hundred percent.
3. Judge the effect on the sample panel over the gradient.
4. Copy the backdrop-filter declaration from the CSS panel.

When to use CSS Backdrop Filter Generator vs related tools

Use it to find a blur and saturation pair for frosted panels, sticky headers, modals and media controls. Use the distinct glassmorphism and frosted glass generators when you want the complete panel recipe with its tint rather than just the filter. When the whole panel should be generated rather than just the filter, the glassmorphism generator writes the tint, border and radius alongside the blur; when the element's own content should be blurred instead, the CSS filter generator is the other property.

Privacy & Security

This tool runs entirely in your browser — no data ever leaves your device. There is no server round-trip, no upload, no logging, and no account required. Your input is processed locally using client-side JavaScript and is never stored, transmitted, or accessible to anyone else. When you close the tab, everything disappears.

Frequently asked questions about CSS Backdrop Filter Generator