CSSintermediate

CSS Animation Generator

build CSS keyframe animations with timeline editor and preview

By Bikram NathLast updated July 5, 2026

A CSS animation generator builds @keyframes blocks visually: set the keyframe stops, easing curve, and duration on a timeline, then copy the finished CSS. Drop in a fade-in-up preset and the output is a named @keyframes rule plus an animation shorthand with fill-mode and iteration count already populated. The live preview loop distinguishes it from typing keyframes by hand or copying static snippets from MDN.

In development

Interactive CSS Animation Generator — coming soon

We're still building the interactive CSS Animation Generator. The guide below explains exactly what it does and how to use it. In the meantime, here are DevLab tools that already work in your browser:

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What is CSS Animation Generator?

CSS Animation Generator provides a timeline interface for composing @keyframe animations without writing CSS syntax by hand. Place keyframe stops at percentage points, assign property values at each stop, pick a timing function, and the tool assembles the @keyframes block plus the animation shorthand. Building a skeleton-loading shimmer, for instance, means setting three stops and adjusting background-position, then copying the finished block.

Animista.net is the better starting point when a named preset like wobble or flip already exists. This generator is more useful when you need precise control over intermediate stops such as 33% and 66%, or when you want to iterate on custom easing without dropping into a local dev environment. It also generates the full shorthand rather than just the @keyframes block.

A recurring gotcha is animation-fill-mode. Without the forwards value, the element snaps back to its pre-animation state when the last keyframe finishes, which looks like a bug in the animation itself. Check whether the exported CSS includes fill-mode: forwards; if it does not, add it manually before shipping. Also avoid animating width or height since those properties trigger layout recalculation on every frame rather than running on the compositor thread.

When to use CSS Animation Generator

✓Prototype a loading spinner or entrance animation visually before writing any @keyframes syntax in your component stylesheet.

→Start from a slide-in or fade preset and adjust the easing stops until the motion matches your design spec.

⚡Verify that a pulsing badge or skeleton shimmer loops smoothly at a specific duration without setting up a local hot-reload environment.

Frequently Asked Questions

Why does my animated element snap back to its original position when the animation ends?

This is animation-fill-mode behavior. By default, fill-mode is none, meaning the browser discards keyframe styles once the animation finishes and returns the element to its pre-animation state. Set animation-fill-mode: forwards to hold the final keyframe values after completion. If the animation also has a delay and you want the starting keyframe applied immediately, use backwards or both. Check whether the copied CSS includes fill-mode in the shorthand; if it does not, add it manually.

Which CSS properties should I animate to avoid jank?

Stick to transform and opacity. Both are handled by the compositor thread and skip layout and paint recalculation entirely, so they stay smooth at 60fps even on mid-range mobile hardware. Animating width, height, margin, padding, top, or left forces a layout pass on every frame, which causes visible stutter. If you need to move an element, translateX and translateY are almost always the correct replacement for animating positional properties directly.

Can I apply two separate @keyframe animations with different durations to the same element?

Yes. The animation property accepts a comma-separated list: animation: spin 2s linear infinite, pulse 1.5s ease-in-out alternate infinite. Each animation runs on its own independent timeline. The caveat is that when two animations target the same CSS property, the one listed later in the comma list wins at each frame, which can produce unexpected results. Keep stacked animations conflict-free by targeting distinct properties in each @keyframes block.

How do I use steps() to animate a sprite sheet instead of a smooth curve?

Replace the easing function with steps(N), where N is the number of frames in your sprite sheet. This makes the animation snap between discrete positions instead of interpolating between them. For example, steps(8, end) divides the total duration into eight equal jumps, advancing to the next background-position at the end of each interval. The second argument, start versus end, controls whether the jump happens at the beginning or end of each step interval, which shifts the visible frame by one position.

Does the generated CSS need -webkit- prefixes to work in Safari?

No, not since Safari 9 released in 2015. The unprefixed animation shorthand, @keyframes, and all animation-* longhand properties have been supported across every major browser for over a decade. You do not need -webkit-animation or @-webkit-keyframes in any browser receiving active security updates today. The only scenario where prefixes still matter is targeting embedded WKWebView instances locked to a specific older iOS version, which is an increasingly rare constraint in modern app development.

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