About

CSS animations are a powerful way to bring a user interface to life, guiding user attention and providing feedback without the overhead of heavy JavaScript libraries. However, hand-coding @keyframes and fine-tuning cubic-bezier timing functions can be tedious and prone to syntax errors.

This CSS Animation Generator streamlines the process. It offers a visual playground to experiment with duration, delays, and easing functions. With a built-in library of over 50 industry-standard presets—from subtle fades to dynamic bounces—and a suite of 15 optimized Bézier curves, you can generate production-ready, cross-browser compatible CSS code in seconds. Whether you are building a micro-interaction for a button or an entrance animation for a hero section, this tool ensures your code remains lightweight and performant.

Formulas

The core logic of a CSS animation involves defining the keyframes (the states) and the animation properties (the timing). The generator constructs the code based on the following flow:

Step 1: Keyframe Definition. The tool maps 0% (start) and 100% (end) states, injecting intermediate percentages for complex presets like 'Bounce' or 'Elastic'.
Step 2: Timing Mathematics. Custom easing is calculated using Cubic Bézier points $(P0, P1, P2, P3)$.
Step 3: Property Binding. The generated class combines all properties: animation: [name] [duration] [timing] [delay] [iteration] [direction] [fill-mode];.

Example of the generated syntax structure:

@keyframes animName { 0% { opacity: 0; transform: translateY(20px); } 100% { opacity: 1; transform: translateY(0); } } .element { animation: animName 0.5s cubic-bezier(0.25, 0.1, 0.25, 1.0) 0s 1 normal forwards; }

Reference Data

Property	Description	Default Value
`animation-name`	Specifies the name of the @keyframes animation	none
`animation-duration`	How long the animation takes to complete one cycle	0s
`animation-timing-function`	The speed curve of the animation (e.g., linear, ease-in)	ease
`animation-delay`	A delay before the animation starts	0s
`animation-iteration-count`	The number of times the animation should play	1
`animation-direction`	Whether the animation plays forward, backward, or alternates	normal
`animation-fill-mode`	Styles applied before and after execution	none

Frequently Asked Questions

CSS animations are generally more performant because the browser can optimize them on the compositor thread, reducing main thread blocking. They are ideal for simple transitions and UI movements, whereas JavaScript is better for complex, state-dependent logic.

The `animation-fill-mode` property dictates how the element looks before and after the animation runs. Using `forwards` is crucial if you want the element to retain its final state (e.g., staying visible after fading in) rather than snapping back to its original style.

Standard linear animations feel robotic. Cubic Bézier curves allow for acceleration and deceleration (easing), mimicking real-world physics. This makes the interface feel more organic, responsive, and polished.