Last updated October 4, 2026 · Report an error
Writing a CSS @keyframes rule by hand means carefully matching up curly braces, property declarations, and the animation shorthand that actually uses it — easy to get slightly wrong when doing it from scratch each time.
This generator builds a complete @keyframes rule from a starting ("from") and ending ("to") set of CSS properties, plus ready-to-use code showing how to apply it to an element.
How it works
Enter an animation name, duration, timing function, and iteration count, along with the CSS properties for the starting and ending states. The generator formats these into a complete @keyframes rule and a matching `.element { animation: ... }` usage snippet.
- Enter animation name.
- Enter duration (seconds).
- Enter timing function.
- Enter iteration count.
- Enter from properties (one per line or semicolon-separated).
- Enter to properties (one per line or semicolon-separated).
- Click Calculate to see your results.
Examples
A simple fade-in animation
Setting "opacity: 0;" as the starting properties and "opacity: 1;" as the ending properties, with a 1-second ease timing, generates a complete @keyframes fade-in rule plus the CSS needed to apply it to any element.
Who should use it
- Quickly generating a fade, slide, or pulse animation for a UI element.
- Prototyping CSS animations without hand-writing the @keyframes syntax.
Industry applications
- Front-end web development
- UI/UX design and prototyping
Advantages
- Generates both the @keyframes rule and the usage code needed to apply it.
- Supports all standard CSS timing functions and iteration counts.
Limitations
- Limited to simple two-state (from/to) animations — multi-step keyframes require manual editing.
Common mistakes to avoid
- Forgetting to also apply the "animation" shorthand property to the actual element — defining @keyframes alone does nothing without a matching animation declaration.
- Using an animation name that conflicts with another @keyframes rule already defined elsewhere in your stylesheet.
Best practices
- Use a descriptive, unique animation name to avoid collisions with other @keyframes rules in your stylesheet.
Tips
- For smoother, more natural-feeling animations, try the "ease-in-out" timing function instead of "linear," which accelerates and decelerates rather than moving at a constant speed.