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Design and CSS Tools

CSS Keyframe Generator

Generate a CSS @keyframes block and animation declaration from start, end, name, and duration values.

ToolRuns in the browser
CSS Keyframe Generator working example

Generate a CSS @keyframes block and animation declaration from start, end, name, and duration values.

Runs in your browser
Sample result
Example CSS Keyframe Generator result
Proportion result
- Missing value x: 12
- Cross-products: 2×12 = 3×8 = 24
- Review the input unit and rounding rule
Next step: compare the two cross-products or test a second known proportion
The interactive tool loads in this area when JavaScript is enabled.

How to use CSS Keyframe Generator

Common uses include Prototype simple motion, Build fade and transform effects, Copy animation CSS.

  • Open CSS Keyframe Generator and enter the three known values in a:b = c:x.
  • Keep a, b, and c in compatible units and make sure the divisor is not zero. Focus first on Prototype simple motion.
  • Calculate x, then compare a×x with b×c to verify the proportion. Use the next pass to Copy animation CSS.
  • Record x together with the input values, unit, and rounding rule before you Build fade and transform effects.

Useful for

  • Prototype simple motion
  • Build fade and transform effects
  • Copy animation CSS

Common issues

The result is undefined or infinite.

Make sure the value used as the divisor is not zero and that every known field contains a number.

The proportion is numerically correct but the real quantity is wrong.

Convert all inputs to compatible units before calculating and keep the unit with the result.

How to interpret the result

Use x only after confirming the proportion order, compatible units, cross-products, and rounding precision.

Related workflow

Next path: CSS Keyframe Generator -> CSS Loading Spinner Generator -> CSS Mask Fade Generator. Keep the original input nearby so you can compare each result before using it elsewhere.

Privacy and review notes

This tool is designed to process inputs in the browser where the workflow allows it. For important work, compare the output with your original source and the rules of the service where you will use it. Use non-sensitive examples and review the output before sharing or submitting it.