Build CSS animations visually — add keyframes, preview live, copy code.
CSS Keyframes Builder is a free online tool that lets you create CSS animations visually with a timeline editor, live preview, and preset library. Build complex keyframe animations by defining property changes at each step, then copy the generated CSS code. The tool provides an intuitive interface for creating @keyframes rules without writing code manually. You can set properties like transform, opacity, color, and position at any percentage point in the animation timeline. The live preview shows your animation running in real-time as you make changes. CSS animations add interactivity and polish to web interfaces. From subtle hover effects and loading indicators to complex entrance animations and scroll-triggered transitions, keyframe animations are a core part of modern web design. Building them visually eliminates the trial-and-error process of writing keyframes by hand. Everything runs entirely in your browser. There are no usage limits and no account required. The generated CSS is standard and works in all modern browsers. Common use cases include creating loading spinners, building entrance and exit animations, designing hover effects for buttons and cards, creating attention-grabbing notifications, building animated icons, and prototyping motion design for web applications.