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CSS Tools

Free CSS Filter Generator

Experiment with all nine CSS filter functions — blur, brightness, contrast, grayscale, hue-rotate, invert, saturate, sepia, and opacity — using a visual editor with real-time preview. Each filter has a number input that starts at its neutral default, so the output CSS only includes the filters you actually change. The preview defaults to a colorful gradient swatch, with an optional image URL field for testing on real photographs. All rendering happens locally in your browser using the CSS filter property.

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What is CSS Filter Generator?

CSS Filter Generator is a visual playground for the CSS filter property, which applies graphical effects like blur, color shifting, and brightness adjustments to any HTML element. Instead of typing filter: blur(3px) grayscale(50%) by hand, you adjust sliders for each of the nine filter functions and see the result instantly. The tool is useful for designing image hover effects, creating grayscale-to-color transitions, building vintage photo styles, and previewing filters before adding them to a production stylesheet.

quickAnswer

Apply CSS filters (blur, brightness, contrast, grayscale, hue-rotate, invert, saturate, sepia, opacity) to a preview element or uploaded image. Adjust each filter with sliders or number inputs and see the result instantly. Copy the CSS filter property when satisfied. All processing is local — images are not uploaded.

Last updated: 2026-06-11

limitations

  • The drop-shadow filter function is not included in this generator. For shadow effects, use the CSS Box Shadow Builder or CSS Text Shadow Generator available separately on this site.
  • The preview uses the CSS filter property, which applies to the entire element including its children. You cannot apply filters to only a background image with CSS alone — use backdrop-filter for behind-element effects.
  • Image preview requires a publicly accessible HTTPS URL. Local file paths, file:// URIs, and authentication-protected images will not load due to browser security restrictions.

Sources:MDN Web Docs · W3C Specifications · jquery.app on GitHub

How to use this tool

  1. Adjust the filter sliders — Blur, Brightness, Contrast, Grayscale, Hue-rotate, Invert, Saturate, Sepia, and Opacity. Each defaults to its neutral value.
  2. Watch the live preview update in real time as you change any slider. The preview shows the filter effect on a colorful gradient swatch.
  3. Optionally paste a public image URL to preview filters on a real photograph instead of the gradient swatch.
  4. Copy the CSS filter property from the output panel. Only non-default filter values appear in the output, keeping the CSS clean.

What you can use it for

  • Preview CSS filter combinations on a gradient swatch before applying them to a website's image gallery hover effect.
  • Test filter values on an uploaded product photo to determine the best settings for a grayscale-to-color card animation.
  • Quickly generate a sepia-tone filter CSS for a vintage photo gallery section of a blog.

Use cases

Practical examples

example

Team photo hover effect

A developer wants to create a grayscale-to-color hover effect for a team photo grid. They open the CSS Filter Generator, set Grayscale to 100% for the default state, then plan a hover rule with Grayscale 0%. The preview confirms the desaturated look, and they copy the filter value into their CSS alongside a transition: filter 0.3s ease rule.

example

Blog image enhancement

A blogger pastes an Unsplash image URL into the generator and adjusts Brightness to 115%, Contrast to 110%, and Saturate to 120%. The subtle boost makes the image more vivid. They note the filter values and apply them to the blog's article hero images via a CSS class.

Common mistakes

  • Applying grayscale and saturate together without understanding order — CSS filters are applied in the order they appear in the property value. grayscale(100%) saturate(0%) produces a different result than saturate(0%) grayscale(100%).
  • Using large blur values on full-width images — blur(20px) on a 1920px-wide hero image forces the GPU to calculate a large kernel and can cause frame drops on mobile devices.
  • Setting brightness to 0% and expecting to restore it — brightness(0%) makes an element completely black. To darken without losing detail, use values between 40% and 80% instead.

verification

  1. Set Blur to 3px and Grayscale to 50%. Verify the preview updates to show a blurred, desaturated effect and the CSS output contains blur(3px) grayscale(50%).
  2. Paste a valid image URL (e.g., https://images.unsplash.com/photo-1506744038136-46273834b3fb?w=400) into the image URL field. Verify the image loads in the preview and the filters apply correctly to the image.

FAQ

Questions about CSS Filter Generator

Why is my image not loading in the preview?

The image URL must be publicly accessible and allow cross-origin requests. Many image hosting services (Unsplash, placeholder services, CDNs) work well. Local file paths (C:\ or file://) will not work because browsers block local file access for security. Use a public HTTPS URL instead.

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