Keyframes Animation Generator

Quick answer: Keyframes Animation Generator is a free online css keyframes generator that lets you name your animation, set its duration, define three keyframe stops with transforms and opacity, watch the demo box animate live, and copy the @keyframes CSS. It works instantly with no signup or download — everything runs privately in your browser.

Name your animation, set its duration, define three keyframe stops with transforms and opacity, watch the demo box animate live, and copy the @keyframes CSS.

What is the Keyframes Animation Generator?

A CSS keyframes generator is a visual tool for building @keyframes animations — the CSS mechanism for choreographing how an element changes over time. You define stops (snapshots of the element’s style at percentage points of the timeline, like 0%, 50%, 100%) and the browser smoothly interpolates between them, producing motion with zero JavaScript.

Each stop can change any animatable property, but transform (moving, scaling, rotating) and opacity (fading) are the stars: they animate on the GPU, stay buttery smooth, and never trigger expensive layout recalculations. A floating badge, a pulsing notification dot, a gently bobbing hero illustration — all are just a few keyframe stops with transforms.

Hand-writing keyframes means juggling the @keyframes block, the animation shorthand, stop ordering and syntax — easy to fumble. This tool structures it for you: name the animation, set the duration, fill in three stops, and watch a demo box perform your exact animation live. The output pairs the @keyframes rule with a ready-to-use class so the animation works the moment you paste it. Seeing motion live removes all guesswork from timing and transforms.

How to use the Keyframes Animation Generator

  1. Give your animation a <strong>name</strong> (letters, numbers, dashes) and set its <strong>duration</strong> in seconds.
  2. Define <strong>stop 1</strong> — usually 0%, the animation’s starting pose with a transform and opacity.
  3. Define <strong>stop 2</strong> — the middle of the timeline (often 50%), where the main change happens.
  4. Define <strong>stop 3</strong> — usually 100%, often mirroring stop 1 so loops feel seamless.
  5. Watch the <strong>demo box</strong> perform your animation live and fine-tune the stops.
  6. Copy the <code>@keyframes</code> block plus the animation class into your stylesheet.

Keyframes Animation Generator use cases

Floating elements

Badges, icons and illustrations that gently bob up and down feel alive. Two translateY stops (0 and -16px) at 0%/100% and 50% create the classic float loop. Gentle perpetual motion keeps interfaces feeling alive.

Attention pulses

Notification dots and CTA buttons that scale slightly in a loop draw the eye without being obnoxious. A scale transform at the 50% stop does the work. Use sparingly so the emphasis stays meaningful.

Entrance animations

Elements that fade and slide in on page load: start at opacity 0 with a translateY offset, end at opacity 1 with no offset. (Set the loop to once in your own CSS with animation-iteration-count.)

Loading and progress motion

Indeterminate progress bars, shimmer effects and skeleton screens are all keyframe loops — design the motion here, then apply it to your own elements. Smooth loops make waiting feel shorter and more polished.

Micro-interactions

Icon wiggles, button nudges and card tilts add personality. Short durations (under a second) with subtle transforms keep micro-interactions delightful rather than distracting. Personality in details separates good interfaces from great ones.

Tips

  • Animate transform and opacity — they run on the GPU and stay smooth; animating width, height or top causes jank.
  • Mirror your first and last stops so infinite loops have no visible jump when they restart.
  • Keep durations between 0.3s and 3s; longer loops feel sluggish, shorter ones feel frantic.
  • Use ease-in-out for gentle back-and-forth motion like floating; linear for constant-speed motion like spinning.
  • Respect prefers-reduced-motion — offer a static experience for users who disable animation.

Frequently asked questions

What are CSS keyframes?
Keyframes are named snapshots of an element's styles at points along an animation timeline. You write an @keyframes block with stops like 0%, 50% and 100%, each declaring property values, and the browser interpolates smoothly between them. An animation property on an element then plays those keyframes over a duration you choose.
Why is my keyframes animation not playing?
The usual culprits: the @keyframes name does not match the animation-name on the element, the animation shorthand is missing or malformed, or the element the class is applied to does not exist. This generator outputs the keyframes block and the applying class together with matching names, so pasting both guarantees they connect.
Should I animate transform or position properties like top and left?
Always prefer transform. Changing top, left, width or margin forces the browser to recalculate layout every frame, which causes jank. Transform and opacity are composited on the GPU and animate smoothly even on modest phones — which is why this generator's stops focus on exactly those two properties.
How do I make an animation play once instead of looping?
The generated class uses infinite looping so you can preview the motion. For a one-shot effect like an entrance animation, change infinite to 1 (or forwards) in the animation shorthand: animation: float 2s ease-in-out 1. Add animation-fill-mode: forwards if the element should hold its final keyframe pose.
Can I use different easing between keyframe stops?
Yes — animation-timing-function can be declared inside individual keyframe stops, not just on the element. That lets the first half of your animation ease differently from the second half, which is how you build realistic bounces and staggered-feeling motion within a single timeline.
What does animation-fill-mode do?
Fill mode controls what the element looks like outside the animation's active time. None (default) snaps back to the element's own styles; forwards holds the final keyframe after finishing; backwards applies the first keyframe during any delay; both combines them. Fill modes matter most for one-shot entrance animations.
How do I run multiple animations on one element?
List them comma-separated in the animation shorthand: animation: float 3s ease-in-out infinite, spin 6s linear infinite. Each needs its own @keyframes block. Generate each animation with this tool, then combine the shorthand lines and keep all the keyframe blocks in your stylesheet.
Do keyframe animations hurt performance?
Transform and opacity keyframes are GPU-accelerated and cheap — you can run many without trouble. Animations of layout properties (width, height, top, margin) or large blurred elements repaint heavily and can jank. Stick to transform/opacity, keep blur out of animated properties, and honor prefers-reduced-motion.