CSS Skeleton Loader Generator
Generate an animated CSS skeleton loader with a shimmer effect for loading placeholders. Customize colour, speed and radius.
Last reviewed by the Radiatus Cloud team
Generate an animated CSS skeleton loader with a shimmer effect.
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Build skeleton loaders with CSS
Skeleton loaders are grey placeholder shapes that mimic the layout of content while it loads, with a shimmer sweeping across them to signal activity. This generator produces the animated CSS from your chosen base and shine colours, animation speed and corner radius. Apply the skeleton class to boxes shaped like your text lines, images and cards to create a realistic loading preview.
The shimmer is created by animating the position of a gradient across the element, needing no images or JavaScript.
Better perceived performance
Skeleton screens improve the perceived speed of an interface because they show structure immediately, reassuring users that content is coming rather than leaving a blank space or a bare spinner. They are now a standard pattern in content-heavy apps and feeds. Matching the skeleton shapes to the real layout makes the transition feel seamless when content arrives.
Keep the base and shine colours close together for a subtle effect, and a moderate speed so the shimmer is noticeable but not distracting. All generation happens locally in your browser.
Notes on the generated code
Because the css skeleton loader generator runs entirely in your browser, you can experiment with every option and watch the generated code update instantly, with nothing uploaded and no account required. The output is clean, standards-based CSS that works in any project without external libraries or a build step, so you can paste it straight into your stylesheet and refine it further by hand whenever you need to.
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Frequently Asked Questions
How does the shimmer animation work?
A gradient is animated across the element by moving its background position, creating a light sweep without images or JavaScript.
Why use skeleton loaders?
They show the content structure immediately, improving perceived performance and reassuring users that content is loading, unlike a blank space.
How do I shape the skeletons?
Apply the skeleton class to boxes sized like your real text lines, images and cards, so the placeholder matches the incoming layout.
What speed should the shimmer be?
A moderate speed, around one and a half seconds, is noticeable without being distracting. Adjust to match your interface\'s feel.
Privacy & Security
Everything runs in your browser; nothing is uploaded.
How to Use
Choose the colours, speed and radius, then copy the CSS.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.
Related Tools
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DesignConvert colours between HEX, RGB, HSL, HWB and OKLCH, with alpha support. Runs in your browser and shows the live swatch for each format.
Accessibility Color Contrast Checker
DesignCheck foreground and background colour contrast against WCAG thresholds, with the rules for text size, UI components and states.
Typography Scale Generator
DesignGenerate a modular type scale from a base size and ratio, with fluid clamp() values for responsive layouts.