Free Web Tools

CSS @property Animation Generator | Animate Custom Properties Visually


📖 About🔰 How to Use📚 Glossary⚙️ Technical Details❓ FAQ💡 Use Cases
🔒100% Browser-Based

No data is ever sent to any server

📝No Registration

No account or login required — start using instantly

⚡Next-Gen CSS

Animate CSS custom properties with @property rules

⚠️ Your browser does not support CSS @property. The preview will display but animation effects cannot be shown.
Preview
Please enter a value matching the syntax type
2s
0s

📝 Generated CSS Code




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📖 About This Tool
The CSS @property Animation Generator is a free tool that lets you visually define CSS @property rules and build smooth animations for CSS custom properties (CSS variables) using an intuitive GUI.
Standard CSS variables cannot be smoothly animated because browsers treat them as plain strings. By defining a type (angle, color, number, etc.) with @property, the browser can interpolate intermediate values for silky-smooth animations. Generate effects like gradient rotation, hue cycling, and numeric countup — all impossible with regular CSS — from 8 ready-made presets.
Everything runs entirely in your browser. No data is sent to any server, and no account registration is required.



🔰 How to Use
Select a Preset
Choose from 8 presets including gradient rotation, hue cycle, and number countup. The @property definition and keyframes will be set automatically.
Adjust Parameters
Use the tabs below the preview to fine-tune the @property settings, @keyframes, and animation settings. Under the "Element Styles" tab, you can freely edit colors, sizes, and layout CSS. The preview updates instantly.
Copy the CSS Code
In the Generated CSS Code section, click the copy button to copy the generated CSS (@property definition, @keyframes, and applied styles) to your clipboard, then paste it into your project.



📚 @property Glossary
@property
A CSS at-rule from CSS Houdini. It explicitly defines the type, initial value, and inheritance of a custom property (CSS variable), enabling the browser to interpolate (animate) its values.
syntax
A required descriptor inside @property. Defines the value type the custom property accepts: <angle>, <color>, <number>, <length>, <percentage>, etc.
inherits
A required descriptor inside @property. When true, child elements inherit the property value from their parent. When false, each element uses the initial value.
initial-value
A required descriptor inside @property. Sets the default value. Must match the syntax type.
CSS Houdini
A collection of browser APIs exposing low-level rendering engine capabilities. @property is part of the CSS Properties and Values API within Houdini.
Custom Properties (CSS Variables)
CSS variables starting with -- (e.g., --my-color). Referenced via var(). Without @property, they have no type information and cannot be animated.



⚙️ Technical Details
CSS @property is a next-generation CSS specification that adds animation capabilities to CSS custom properties.
Why Can't Regular CSS Variables Be Animated?
CSS custom properties like --my-color: red are treated as plain strings by the browser. Since intermediate string values cannot be computed, transitions and animations cause abrupt value changes. Declaring syntax: "<color>" via @property tells the browser to interpret the variable as a color, enabling smooth interpolation.
Three Required Descriptors
syntax defines the value type (<angle>, <color>, etc.), inherits controls inheritance from parent elements, and initial-value sets the default. All three are mandatory in every @property rule.
Browser Support
Supported in Chrome 85+, Edge 85+, Safari 15.4+, and Firefox 128+. In unsupported browsers, the CSS variable falls back to a plain string — animations won't play but layout remains intact (progressive enhancement).



❓ FAQ
Q. Is any data sent to a server?
A. No. Everything runs entirely in your browser. No data — including generated CSS code — is ever transmitted to any server.
Q. What's the difference between @property and regular CSS variables?
A. Regular CSS variables (--my-var) are treated as strings by the browser and cannot be smoothly animated. @property declares a type (<color>, <angle>, etc.), enabling the browser to interpolate intermediate values for seamless animations.
Q. Does it work in all browsers?
A. Supported in Chrome 85+, Edge 85+, Safari 15.4+, and Firefox 128+. In unsupported browsers, animations are simply disabled without breaking layout.
Q. Can I use the generated code as-is?
A. Yes. Just copy the @property definition, @keyframes, and applied styles into your CSS file, and it works immediately.
Q. Is JavaScript required?
A. No. The generated code is 100% pure CSS. No JavaScript is needed.
Q. Does it work with React/Vue/Next.js?
A. Yes. It's standard CSS compatible with any framework, including CSS modules and styled-components.
Q. Does it work on mobile?
A. Yes. The tool is fully responsive, though parameter adjustment is best done on desktop.
Q. Is it free?
A. Yes. Completely free with no usage limits.



💡 Use Cases
🎨
Landing Pages & Portfolios
Add premium visual effects to hero sections with rotating gradients or smoothly shifting CTA button colors — all without JavaScript.
📊
Dashboards & Data Visualization
Implement number countup and progress bar animations in pure CSS. Create rich UIs with minimal performance impact.
💻
Brand & Corporate Websites
Express subtle, elegant animation effects like hue transitions and border color shifts using CSS only, keeping page loads fast.
📚
CSS Learning & Education
Explore the effects of syntax, inherits, and initial-value descriptors in real time. A perfect interactive learning tool for modern CSS specs.




  
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