CSS Animation Generator

Build CSS keyframe animations with presets, timing and iteration controls

What is it and how does it work?

A CSS animation generator lets you build keyframe animations visually — choosing an effect, setting the timing, easing and how many times it repeats — then copy the CSS, including the @keyframes rule and the animation property. CSS animations move an element through a sequence of states defined as keyframes, and writing them by hand means juggling the keyframe percentages, the duration, the timing function and the iteration settings all at once. Picking from presets and tuning the controls turns that into a few clicks.

The parts that shape how an animation feels are the duration, the timing function and the iteration count. Duration sets the speed; the timing function (ease, linear, ease-in-out and custom curves) controls how the motion accelerates and decelerates, which is what separates a natural-looking animation from a robotic one; and iteration count decides whether it plays once or loops. Seeing the effect preview live as you adjust these is far faster than editing values and reloading. This tool generates standards-based CSS in your browser, ready to paste onto any element.

Common use cases

• Adding a fade or slide-in: pick a preset entrance effect and copy the CSS to animate an element appearing.
• Creating a looping animation: set the iteration count to infinite for a pulsing button or loading indicator.
• Fine-tuning motion: adjust the duration and easing to make a transition feel smooth and natural before copying it.

Frequently asked questions

What are @keyframes?

A @keyframes rule defines the stages of an animation as percentages from 0% to 100%, each specifying the element's style at that point. The browser smoothly interpolates between them, so 0% { opacity: 0 } to 100% { opacity: 1 } produces a fade-in. The generator writes this rule for you.

What does the timing function do?

The timing function controls how the animation's speed varies over its duration. linear moves at a constant rate, while ease, ease-in-out and custom cubic-bezier curves speed up and slow down. The right easing is what makes motion feel natural rather than mechanical, so it strongly affects the result.

How do I make an animation loop?

Set the animation-iteration-count to infinite, which makes it repeat continuously — used for spinners, pulses and ambient effects. A specific number repeats that many times, and the default of 1 plays it once. The generator exposes this so you can choose a single play or an endless loop.

Will CSS animations work across browsers?

Yes — CSS keyframe animations are widely supported across modern browsers. They also run efficiently because the browser can optimise them, and they degrade gracefully: if animation is unsupported or reduced, the element simply appears in its final state rather than breaking.

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