CSS Animation Library for Developers and Ninjas — cssanimation.io

A Powerful CSS Animation Library with GSAP Support for Advanced Motion Design.

cssanimation.io is a lightweight, modular CSS animation library designed for developers, designers, and UI ninjas. It provides over 300+ CSS and GSAP-powered plug-and-play animation classes to bring your interfaces to life — from simple fades and zooms to dynamic letter effects and 3D transitions.

You stay in control, just apply the class names when and where you want them. Zero setup. Just clean, reusable animations.

Why Developers Love It

Over 300 prebuilt animations: fade, zoom, rotate, fly, bounce, skew, and more.
GSAP support: Add powerful animations with GreenSock.
Animations for text, elements and individual letters.
Easy to use: just add a class, and your animation is live.
Customizable: tweak animation properties to fit your design.
Zero JavaScript, no dependencies, and fine-grained control.

CSS Animation Guide

Installation Guide

Install via NPM

npm i cssanimationio

Import Everything with One Line

import 'cssanimationio';

This will:

Load all core CSS animations
Load all utility classes
Initialize the letter animation engine
Import all GSAP animations and make them ready to use

Full GSAP + CSS Import (Bundler)

import 'cssanimationio/css';
import { animationMap } from 'cssanimationio/gsap';

Individual Imports

CSS only

import 'cssanimationio/css';           // Core CSS
import 'cssanimationio/utility';       // Utility CSS

GSAP only

import { animationMap } from 'cssanimationio/gsap';
// or use CDN/UMD from cssanimationio/gsap/min.js

CSS Letter Animation

import { initLetterAnimations } from 'cssanimationio/letter';

Install via CDN

Include the cssanimation.css library into the <head>:

<head>
    <link
        href="https://cdn.jsdelivr.net/npm/cssanimationio@latest/dist/cssanimation.min.css"
        rel="stylesheet"
    />
</head>

Usage Examples

After installing cssanimation.css library, now add the class .cssanimation and the class of animation name like .ca__fx-FadeIn for fade in animation to an element. For list of animation class name click here.

<h1 class="cssanimation ca__fx-FadeIn">cssanimation</h1>

That's it! You've got a CSS animated element. Super! 🎉

Prefix System for CSS Animations & CSS Utilities

Prefix	Description	Example Usage
`ca__fx-`	Visual FX animations (pure CSS)	`<h1 class="ca__fx-BounceX">`
`ca__u-`	Utility classes (pure CSS spacing, layout, etc.)	`<h1 class="ca__u-SpeedChill">`
`ca__lt-`	Letter-based animations	`<h1 class="ca__lt-PopOut">`

How to Use CSS Letter Animations

Want to animate text, letter by letter?

The cssanimation.io library includes 100+ letter-based effects (.ca__lt-FadeIn, .ca__lt-ZoomIn, .ca__lt-Snake, etc.).

cssanimation.io also includes two exclusive types of letter animations: .ca__lt-sequence and .ca__lt-random, which must be added to any element you want to animate letter by letter.

What Are Sequence and Random Animations?

.ca__lt-sequence – Letters animate one after another, in order.
.ca__lt-random – Letters animate in a randomized order, adding playful motion.

Step 1. Include the Script

You’ve already installed the cssanimation.io library, so there’s nothing else you need to do if you’re bundling it via a module system like Vite, Webpack, or using itwith a framework (React, Vue, etc.).

If you’re using plain HTML without a bundler, just add the following <script> before the closing </body> tag:

<script src="https://cdn.jsdelivr.net/npm/cssanimationio@latest/dist/ca-letteranimation.js"></script>

Step 2. Add Animation classes to Your HTML

Class	What It Does
`.cssanimation`	Base class for all animations (*required)
`.ca__lt-FadeIn`	A letter animation class (Fades in each letter)
`.ca__lt-sequence`	Animates letters in order or
`.ca__lt-random`	Animates letters in random order

<h1 class="cssanimation ca__lt-FadeIn ca__lt-sequence">cssanimation</h1>

<h2 class="cssanimation ca__lt-FadeIn ca__lt-random">Surprise!</h2>

CSS Letter Animation Delay Control

You can now customize the animation delay between letters using the ca__lt-delay attribute, no need to edit JavaScript!

<div class="cssanimation ca__lt-FadeIn ca__lt-sequence" ca__lt-delay="200">
    This will animate letter-by-letter with a 200ms step
</div>

<div class="cssanimation ca__lt-FadeIn ca__lt-random" ca__lt-delay="50">
    Random delay with 50ms steps
</div>

ca__lt-delay sets the delay step in milliseconds for each letter span.
Works for both .ca__lt-sequence and .ca__lt-random classes.

Browse the full list of ca__lt (letter-based) animation classes: Cheatsheet on GitHub

This feature is exclusive to cssanimation.io — making it perfect for creative headlines, banners, parallax effect, hero sections, and expressive UI storytelling.

Modular Import

Only need one effect? Import it like this:

HTML

<link rel="stylesheet" href="./dist/modules/ca__LetterFadeIn.css" />

CSS or SCSS

@import './dist/modules/ca__LetterFadeIn.css';

JavaScript (Webpack/Vite/Rollup)

import './dist/modules/ca__LetterFadeIn.css';

Import everything in one go using the index file:

<link rel="stylesheet" href="./dist/modules/ca__index.css" />

import './dist/modules/ca__index.css';

Available Modules

Module	File
Blur In	`./dist/modules/ca__BlurIn.css`
Blur Out	`./dist/modules/ca__BlurOut.css`
Bounce	`./dist/modules/ca__Bounce.css`
Door Open Close	`./dist/modules/ca__Door.css`
Dance	`./dist/modules/ca__Dance.css`
...and more	See `./dist/modules/` folder

Each file is generated from ./dist/modules/cssanimation.css
Follows the naming convention: ca__[AnimationName].css (PascalCase)
ca__index.css imports all animation modules

Utility Class

cssanimation.io offers a powerful set of pre-built utility classes. Just use them along with the .cssanimation base class and your chosen animation class.

This includes:

.ca__u-Speed*: Control speed
.ca__u-Ease*: Easing control
.ca__u-Loop*: Repeat settings
.ca__u-Delay*: Add delays

Check out the full list of utility classes with details in cssanimation-utilities.md.

Combo Example

<p
    class="cssanimation ca__fx-zoomIn ca__u-SpeedChill ca__u-Delay3 ca__u-EaseSnappy ca__u-LoopTriple"
>
    Magical Entrance!
</p>

GSAP Animation Guide

cssanimation.io isn’t just about CSS – it also supports GSAP (GreenSock Animation Platform), the gold standard for JavaScript animations. With GSAP, you get even more powerful, smooth, and flexible control over your animations.

Supports animations via HTML using ca-gsap attributes, with JSON-configurable options.

Why Use the GSAP Version?

Smoother and more performant animations.
Fine control over timing, easing, delays, and sequencing.
Works great with ScrollTrigger, SplitText, and other GSAP plugins.
Ideal for creative UI/UX and motion design.

Getting Started with GSAP Version

Here’s how to animate elements using our GSAP-powered version:

1. Install via NPM

npm install cssanimationio gsap

Then in your JavaScript:

// Import GSAP core
import { gsap } from 'gsap';

Or Include via CDN. If you're working without a bundler:

<!-- GSAP -->
<script src="https://cdn.jsdelivr.net/npm/gsap@3.13.0/dist/gsap.min.js"></script>

<!-- cssanimation.io's GSAP script -->
<script src="https://cdn.jsdelivr.net/npm/cssanimationio@latest/dist/cssanimation-gsap.umd.min.js"></script>

2. Add Animation Classes to Your Elements

Add the GSAP animation name in the ca-gsap data atribute like:

<h1 ca-gsap="ca__gx-FadeIn">cssanimation.io GSAP</h1>

ca-gsap="ca__gx-FadeIn" – selects which animation to use
ca-gsap-options='{}' – passes GSAP options to the animation function

📌 Tip: Check the full list of animation class names in the cssanimation-reference.md.

Custom Animation Options with `ca-gsap-options`

You can control GSAP animation parameters using a JSON string inside the ca-gsap-options attribute:

<div
    ca-gsap="ca__gx-FadeIn"
    ca-gsap-options='{
  "from": { "opacity": 0, "y": 80, "scale": 0 },
  "to": { "opacity": 1, "y": 0, "duration": 1.5, "ease": "sine.out", "scale": 1.2 }
}'
>
    Custom Animated Box
</div>

You can use any valid GSAP properties, including:

Option	Example
`x`, `y`	`"y": 50`
`duration`	`"duration": 1.2`
`delay`	`"delay": 0.5`
`repeat`	`"repeat": -1`
`yoyo`	`"yoyo": true`
`ease`	`"ease": "sine.inOut"`
`opacity`	`"opacity": 0.7`
`rotation`	`"rotation": 45`
`scaleX`, `scaleY`	`"scaleX": 1.3`

Common Mistakes

Invalid JSON:

<div data-gsap-options='{"duration": .5}'>❌ Missing leading 0</div>

Correct:

<div data-gsap-options='{"duration": 0.5}'>✔️ Valid</div>

General Tips:

Always use double quotes (")
Include leading zeros (0.5, not .5)
No trailing commas

3. GSAP Letter Animations

You can apply letter-by-letter GSAP animation, by using the ca__gx-lt attribute with one of the following modes:

sequence – animates letters from left to right
reverse – animates letters from right to left
random – animates letters in random order

Use it alongside the ca-gsap attribute like this:

<h2 ca-gsap="ca__gx-FadeIn" ca__gx-lt="sequence">
    letter-by-letter GSAP animation
</h2>
<h2 ca-gsap="ca__gx-FadeIn" ca__gx-lt="reverse">
    letter-by-letter GSAP animation
</h2>
<h2 ca-gsap="ca__gx-FadeIn" ca__gx-lt="random">
    letter-by-letter GSAP animation
</h2>

Each letter will be automatically wrapped in a <span> and animated based on the chosen order mode.

🎉 That’s It!

CSS vs. GSAP – Which Animation Version Should You Use?

Feature / Capability	CSS Version	GSAP Version
🧱 Technology	Pure CSS	JavaScript (GSAP)
⚡ Performance	Great for simple UI effects	Optimized for complex, smooth animations
🎛 Control	Fine-grained control via CSS	Fine-grained control via JS (timing, easing)
🎞 Animation Types	Predefined class-based animations	Class-based with dynamic GSAP tweening
🔤 Letter Animation Support	✅ Sequence & Random	✅ Sequence only (random coming soon)
🔁 Looping & Repeating	`infinite` class	Full loop control via JS (e.g. `repeat`, `yoyo`)
⚙️ Configuration	Minimal setup	Script includes + optional JS tweaks
🎨 Customization	Moderate (via utility classes)	High — control properties on the fly
📦 Size	Very lightweight (no JS needed)	Heavier due to JS dependency
🧩 Dependencies	None	Requires GSAP (`TweenMax`)
🌐 CDN Available?	✅ Yes	✅ Yes
🛠 NPM Ready?	✅ Yes (`cssanimationio`)	✅ Yes (`cssanimationio`)
🧠 Use Case Examples	Hover states, hero sections, banners	Interactive animations, scroll triggers, custom flows

Accessibility: Reduce Motion Support

By default, cssanimation.io respects user system preferences. When prefers-reduced-motion: reduce is enabled, animations are automatically turned off for a better UX.

License

cssanimation.io is licensed under the Parity Public License.

Contribute

We welcome issues, pull requests, and suggestions! Make your animations even more magical.

gsapanimation

CSS Animation Library for Developers and Ninjas — cssanimation.io

Why Developers Love It

CSS Animation Guide

Installation Guide

Install via NPM

Import Everything with One Line

Full GSAP + CSS Import (Bundler)

Individual Imports

Install via CDN

Usage Examples

Prefix System for CSS Animations & CSS Utilities

How to Use CSS Letter Animations

Step 1. Include the Script

Step 2. Add Animation classes to Your HTML

CSS Letter Animation Delay Control

Modular Import

Only need one effect? Import it like this:

Available Modules

Utility Class

GSAP Animation Guide

Why Use the GSAP Version?

Getting Started with GSAP Version

1. Install via NPM

Or Include via CDN. If you're working without a bundler:

2. Add Animation Classes to Your Elements

Custom Animation Options with ca-gsap-options

Common Mistakes

General Tips:

3. GSAP Letter Animations

🎉 That’s It!

CSS vs. GSAP – Which Animation Version Should You Use?

Accessibility: Reduce Motion Support

License

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Custom Animation Options with `ca-gsap-options`

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