Build, Sort and Preview a CSS Keyframe Sequence

How to Use This Tool

Turn percentage/value rows into deterministic @keyframes with timing controls. Generate sorted CSS animation keyframes from percentage and transform rows, detect duplicate stops, preview timing settings, and copy valid CSS.

The work this page finishes

Handwritten keyframes often contain duplicate percentages, unsorted stops or a malformed transform that invalidates the animation block. For CSS Keyframe Generator, keeping source order beside the computed artifact lets a user repair only the failed entries and reproduce the same batch later.

Deterministic workflow

Validate a deliberately narrow transform token set and opacity range, require unique 0–100 percentages, sort stops numerically and emit one named animation declaration. For CSS Keyframe Generator, a run is capped at 5,000 items and 2 MB, preventing an accidental oversized paste while preserving successful rows when another row fails.

Why a dedicated interface helps

Paste the result into a test stylesheet, inspect motion at the actual component size and provide reduced-motion behavior before production use. For CSS Keyframe Generator, a purpose-built form exposes every assumption and returns the same ordered structure on every run, which is more practical than reconciling shifting conversational output.

Assumptions

• Each row represents one percentage stop.
• Transform text uses the documented safe token subset.
• The consumer adds reduced-motion and component-specific styling.

For CSS Keyframe Generator, keep an untouched copy for comparison after import; the browser performs the work locally, but local software and extensions are not controlled by this page.

Limitations and review boundary

It does not parse arbitrary CSS, guarantee browser rendering, generate JavaScript animation, assess vestibular risk or execute pasted declarations as active style. For CSS Keyframe Generator, the implementation neither follows user-entered links nor evaluates their contents, and it displays material as plain text rather than active HTML.

Verification and provenance

Fixtures derived from the displayed rule and W3C CSS Animations Level 1 were reviewed on 2026-08-26; they include normal, empty or invalid, and partial-failure behavior. The sample sorts three stops into one slidePulse animation with a two-second ease-in-out declaration.