Is the CSS Keyframe Builder free?

Yes. Every VersaTools tool is completely free — no account, no watermark, and no sign-up required.

Is anything uploaded to a server?

No. The timeline, preview, and CSS are all generated in your browser. Nothing is uploaded and no data leaves your device.

What CSS does it output?

It produces a standard @keyframes block using transform (translate, scale, rotate) and opacity, plus an animation shorthand with your duration, easing, iteration count, and direction. You can copy it or download animation.css.

Can I move or delete keyframes?

Yes. Drag any dot along the track to change its timing, and delete any keyframe you add. The 0% and 100% endpoints stay fixed in place, but their transform and opacity values are fully editable.

Why does the preview sometimes start paused?

If your system prefers reduced motion, the preview starts paused out of respect for that setting. Press Play to run it anyway.

CSS Keyframe Builder

CSS & UI Tools

Build CSS animations with a visual timeline and export @keyframes.

Presets

Keyframe at 50%

Translate X

Translate Y

Scale

Rotate

deg

Opacity

Animation

Duration1.5s

Easing

Iterations

Direction

Timeline

0%50%100%

3 keyframes. Click the track to add, drag a dot to retime.

Preview

CSS output

@keyframes my-animation {
  0% {
    transform: none;
  }
  50% {
    transform: scale(1.25);
  }
  100% {
    transform: none;
  }
}

.animated-element {
  animation: my-animation 1.5s ease-in-out infinite normal;
}

Tool Overview & Guide

What is CSS Keyframe Builder?

CSS Keyframe Builder lets you design a transform animation on a visual timeline and exports clean, standard @keyframes CSS. Add keyframes along the track, set translate, scale, rotate, and opacity for each one, and watch a live preview loop as you edit. When it looks right, copy or download the CSS — everything runs in your browser with no build step and no account.

Technical Specifications & Supported Formats

Processing Engine:Client-side Native JavaScript & WebAssembly

Privacy & Security:100% In-Browser (Zero File Upload)

Supported Formats:All Standard Formats & Code Text

Max File Limit:100 MB

How to use CSS Keyframe Builder

3 simple steps to complete your task directly in your browser:

Start from a preset or blank
Pick a preset to load a ready-made animation, or begin with the default start and end keyframes and build from there.
Add and place keyframes
Click anywhere on the timeline track to add a keyframe, and drag any dot to retime it. The start and end sit at 0% and 100%, while new stops interpolate from the surrounding values.
Edit the transform
Select a dot to adjust its Translate X and Y, Scale, Rotate, and Opacity with sliders or exact number inputs. Every change updates the preview instantly.

Common uses

Build a bounce, pulse, or slide-in effect for a UI element
Prototype a hover or attention animation without hand-writing keyframes
Fine-tune easing and timing while watching a live preview
Learn how transform and opacity keyframes translate into CSS
Generate reusable @keyframes for a design system or component library
Create a looping animation for a loader, badge, or call-to-action

Why choose VersaTools

100% private

Your files are processed inside your browser and are never uploaded to a server.

Free, no account

No sign-up, no watermark, no paywalled “premium” tier. Just open a tool and use it.

Instant

No upload, no queue, no server round-trip — work starts the moment you drop a file.

Runs in your browser

Built on open web standards. Works on any modern desktop browser, nothing to install.

No upload size caps

Nothing leaves your device, so there’s no server file-size limit — only your machine’s memory.

Yours to keep

Results download straight to your device in clean, standard file formats.