CSS Animation Generator – Build @keyframes Visually

Build smooth CSS animations without writing a single line by hand

Pick a preset or configure your own keyframes, hit generate, and copy clean, ready-to-paste CSS animation code. No library installs, no build steps – just the code you need in seconds.

How to use the CSS animation generator

1. Choose a preset – start with a built-in effect like fade, slide, bounce, or spin, or begin from a blank canvas.
2. Adjust the settings – set duration (how long one cycle takes), timing function (how it accelerates), delay, and iteration count (how many times it repeats).
3. Preview live – watch the animation play on-screen before committing to any code.
4. Copy the output – grab the @keyframes block and the animation shorthand, then paste them into your stylesheet.

Worked example – a bouncing element

Say you want a button that gently bounces to catch the user's eye. Configure duration to 1.5 s, timing function to ease-in-out, and iteration count to infinite. The generator produces:

/* @keyframes block */
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-30px); }
}

/* Apply it to your element */
.cta-button {
  animation: bounce 1.5s ease-in-out infinite;
}

Paste both blocks into your CSS file, add the class cta-button to your HTML element, and the bounce starts immediately – no JavaScript needed.

Breaking down the shorthand: animation: bounce 1.5s ease-in-out infinite;

How to trigger CSS animations in code

Sometimes you want an animation to start on a user action rather than on page load. Here are two minimal, copy-pasteable patterns.

JavaScript – add a class to start the animation:

// JavaScript
const btn = document.querySelector('.cta-button');
btn.addEventListener('click', () => {
  btn.classList.add('is-animating');
});

In your CSS, move the animation property onto .is-animating instead of the base class so it only fires on click.

CSS-only – trigger on hover (no JavaScript at all):

/* CSS */
.card:hover {
  animation: bounce 1.5s ease-in-out 3;
}

Set iteration count to a finite number so the animation plays three times and then stops, rather than looping forever on hover.

How it works

The generator builds a standard CSS @keyframes rule (the official MDN reference) entirely in your browser. You adjust sliders and dropdowns; the tool assembles the correct CSS syntax and shows a live preview using the same engine your browser already uses to render pages. Nothing is sent to a server – your configuration stays on your device.

The @keyframes rule defines what the element looks like at each percentage of the animation timeline. The animation shorthand property tells the browser which keyframe block to use, how fast to run it, and when to stop. The CSS Animations Level 1 spec (W3C) is the definitive reference if you want to dig deeper.

When to use a keyframe animation generator – and when not to

Great for:

• UI micro-interactions – button pulses, loading spinners, skeleton shimmer effects
• Entrance and exit transitions for modals, toasts, and banners
• Looping decorative motion on a landing page
• Learning how @keyframes syntax works without trial-and-error

Reach for something else when:

• You need scroll-driven animations – use the newer CSS animation-timeline property or a library like GSAP instead
• You're animating hundreds of elements with unique paths – a JavaScript animation library (GSAP, Framer Motion) gives you more programmatic control
• The animation must react to live data (e.g., progress bars tied to an API value) – JavaScript is the right layer for that logic

Your data stays private

Everything runs directly in your browser. No keyframe settings, element names, or CSS output are uploaded anywhere. Close the tab and the session is gone.

Ready to build your first animation? Use the generator above, copy the code, and drop it straight into your project. For other CSS workflow helpers, see our related tools below.