CSS Keyframe Animation Builder

The CSS Keyframe Animation Builder lets you build @keyframes animations visually, with a live preview updating as you adjust each step, so you can see exactly how an animation moves before copying the finished CSS into your project — rather than writing keyframe percentages blind and refreshing a browser tab to check each change.

Keyframe animations are one of those CSS features that’s simple in concept and fiddly in practice. The syntax itself is straightforward — a set of percentage steps, each describing property values at that point in the animation — but getting the timing and easing to actually feel right takes iteration, and iterating by editing raw CSS and reloading a preview page is slow. Seeing the animation play live as you adjust keyframe values, timing, and easing turns that iteration loop from minutes into seconds.

To use it, add keyframe steps (0%, 50%, 100%, or whatever percentages your animation needs) and set the property values — transform, opacity, color, whatever you’re animating — at each step. Adjust duration, timing function, and iteration count, and watch the live preview play the animation as you go. Once it looks right, copy the generated @keyframes rule and the accompanying animation property straight into your stylesheet.

This is aimed at the everyday case of building a specific animation for a specific element — a button hover effect, a loading spinner, an entrance animation — rather than a full animation timeline editor for complex, multi-element sequences.

FAQ

What CSS properties can I animate with this tool?

Standard animatable CSS properties are supported — transform, opacity, color, background-color, and other common properties used in typical UI animations. Properties that CSS itself doesn’t support animating (like display) won’t animate here either, since that’s a browser limitation, not a tool limitation.

Does this generate both the @keyframes rule and the animation property, or just one?

Both — the generated CSS includes the full @keyframes definition along with the animation shorthand (or its longhand properties) needed to actually apply it to an element, so it’s ready to paste and use directly.

Can I preview how the animation looks on an actual element shape, or just an abstract preview?

Check the preview options available — many keyframe builders let you preview against a representative shape (a box, a circle) that approximates common real elements like buttons or cards, which is usually close enough to judge timing and easing before dropping it into your actual project.

Will the animation timing feel the same in the preview as in my actual project?

It should, since the preview runs the actual generated CSS animation rather than a simulated approximation — differences you might see are more likely due to your project’s own CSS (transitions, other animations, layout) interacting with it than the animation itself behaving differently.