Animation Keyframe Builder
Visually create CSS @keyframes animations with a timeline editor. Add property tracks, drag keyframes, set values at each point, preview live, and export production-ready CSS.
Click a keyframe dot on the timeline to edit its value.
How It Works
- Add property tracks (opacity, transform, colors, etc.)
- Click on a track to add keyframes at any percentage
- Drag keyframes to reposition them on the timeline
- Select a keyframe and set its value in the property editor
- Preview live with play/pause controls
- Copy the generated CSS code to use in your project
Features
- 14 animatable CSS properties supported
- Drag-and-drop keyframe positioning
- Real-time animation preview
- 12 preset animations to start from
- Per-keyframe easing functions
- Full CSS @keyframes code export
- Duration, iteration, direction controls
- Multiple transform properties combinable
What is the Animation Keyframe Builder?
The Animation Keyframe Builder is a free visual tool for creating CSS @keyframes animations without writing code from scratch. You design animations using a timeline editor, drag keyframes to position them, set values for each CSS property at each point, and see the result live in the preview panel.
It supports 14 animatable CSS properties including transforms (translate, scale, rotate, skew), opacity, colors, box-shadow, border-radius, and filters. The generated code is clean, standard CSS that works in all modern browsers.
How to Use This Tool
Follow these steps to build a CSS animation visually:
- Pick a preset or start from scratch - Choose from 12 presets (fadeIn, bounce, shake, spin, glow, wobble, etc.) or build your own by adding property tracks.
- Add property tracks - Select a CSS property from the dropdown and click "Add Track" to create a new timeline track for that property.
- Add and position keyframes - Double-click anywhere on a track to add a keyframe. Drag keyframes left and right to set their percentage position along the animation timeline.
- Set values and easing - Click any keyframe dot to select it. In the property editor on the right, set the value, position percentage, and easing function for that keyframe.
- Preview and export - Hit play to see the animation running live. Copy the generated CSS code from the output panel below the timeline.
Key Features
- 14 CSS properties - Animate opacity, translateX/Y, scale, rotate, skew, background-color, color, border-radius, box-shadow, width, height, blur, and brightness.
- 12 animation presets - fadeIn, fadeOut, slideInLeft, slideInUp, bounce, pulse, shake, spin, zoomIn, flipX, glow, and wobble.
- Drag and drop keyframes - Grab any keyframe dot and drag it along the timeline to reposition. Double-click a track to add new keyframes at precise positions.
- Per-keyframe easing - Set different timing functions (linear, ease, ease-in-out, cubic-bezier) at each keyframe for complex motion curves.
- Live preview with playback controls - Play, pause, and scrub through the animation. Adjust duration, iteration count, direction, and fill mode.
Common Use Cases
Web developers use this to create entrance animations for hero sections, loading spinners, attention-grabbing button effects, and micro-interactions. Designers who prefer visual tools over hand-coding CSS find the timeline editor intuitive for experimenting with timing and easing. It is also useful for learning how @keyframes syntax works by seeing the generated code update in real time as you manipulate the visual controls.
Frequently Asked Questions
Can I animate multiple properties at the same time?
Yes. Add multiple property tracks and they combine automatically. For example, you can animate opacity from 0 to 1 while also translating from -20px to 0px. The generated CSS merges transform properties correctly into a single transform declaration per keyframe.
What is the difference between animation-direction normal and alternate?
With "normal", the animation plays from 0% to 100% each iteration and snaps back to the start. With "alternate", it plays forward on odd iterations and backward on even ones, creating a smooth back-and-forth effect. Alternate is great for pulse, bounce, and glow effects where you want seamless looping.
How do I create a bounce effect?
Use the "bounce" preset as a starting point. It creates multiple keyframes on a translateY track with decreasing offsets. The key is adding several intermediate keyframes (20%, 40%, 50%, 60%, 80%) that create progressively smaller bounces. You can customize the height and speed by editing each keyframe's value.
What does animation-fill-mode do?
Fill mode controls what happens before and after the animation runs. "forwards" keeps the final keyframe styles applied after the animation ends. "backwards" applies the first keyframe styles during any delay before the animation starts. "both" does both. "none" (default) reverts to the element's original styles when the animation is not active.
Will the generated CSS work in all browsers?
Yes. CSS @keyframes and the animation shorthand property are supported in all modern browsers including Chrome, Firefox, Safari, and Edge. No vendor prefixes are needed for current browser versions. The generated code uses standard syntax with no dependencies.