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CSS Animation Generator

Writing CSS animations from scratch means juggling the @keyframes rule, the animation shorthand, timing functions, fill modes, and iteration counts simultaneously without seeing the result until you save and refresh the browser tab.

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Live preview updates as you adjust values

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Generates complete @keyframes and animation property code

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No hand-coding required for standard animations

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Copy-ready output for any CSS file or framework

Cost: Free forever
Sign-up: Not required
Processing: In your browser
Privacy: Files stay local

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Add this Animation Builder to your website

Drop the Animation Builder into any page — blog post, product docs, intranet, school portal — with a single line of HTML. Your visitors get the full tool, processed entirely in their browser. No backend, no uploads, no signup.

Files stay 100% in the visitor's browser
Responsive — adapts to any container width
Free forever, no API key needed

Embed code

<iframe
  src="https://www.fixtools.io/css-tool/animation-builder?embed=1"
  width="100%"
  height="780"
  frameborder="0"
  style="border:0;border-radius:16px;max-width:900px;"
  title="Animation Builder by FixTools"
  loading="lazy"
  allow="clipboard-write"
></iframe>

<iframe
  src="https://www.fixtools.io/css-tool/animation-builder?embed=1"
  width="100%"
  height="780"
  frameborder="0"
  style="border:0;border-radius:16px;max-width:900px;"
  title="Animation Builder by FixTools"
  loading="lazy"
  allow="clipboard-write"
></iframe>

Attribution-friendly: a small "Powered by FixTools" link appears in the embed footer.

What CSS Animations Require and Why a Visual Generator Speeds Up the Process

A CSS animation has two required parts: a @keyframes rule that defines what the element looks like at each stage of the animation, and an animation property on the element itself that connects those keyframes to the element and controls how they play back in the browser. The @keyframes rule uses a developer-chosen name, a set of percentage-based stops (or the simpler from/to shorthand for two-stop animations), and one or more CSS property values at each stop. The animation property references that keyframes name and specifies duration, easing function, delay, iteration count, direction, fill mode, and play state. Getting these two parts to work together correctly requires understanding how each sub-value interacts with the others, and iterating by editing code and reloading the browser tab is slow even for experienced developers who already know the syntax inside out.

A visual CSS animation generator removes the manual iteration loop entirely. You set the duration with a slider, choose an easing curve from a visual control, define the property values at each keyframe stop using direct manipulation, and the tool writes both the @keyframes block and the animation shorthand declaration for you in valid CSS. The preview element applies the generated code in real time inside the browser, so you see the exact timing and feel of the animation before copying anything to your project. Adjusting a cubic-bezier easing curve visually by dragging two control points takes a few seconds; translating that same curve into four numeric values by hand and testing each variant by reloading the page takes several minutes per iteration. The visual tool also catches syntax errors before they ship, since the output is generated from a known-good template rather than typed character by character.

CSS animations are the right tool for state transitions that do not depend on runtime data or precise scroll position synchronization. The browser runs CSS animations on the compositor thread for transform and opacity properties, meaning they do not block the main JavaScript thread or trigger expensive layout recalculations on every frame. JavaScript animation libraries like GSAP or Framer Motion offer more flexibility for complex sequencing, scroll-linked motion, and physics-based interactions, but for entrance effects, loading indicators, hover states, and attention cues, a CSS animation generated in a visual tool and copied into your stylesheet is the most direct path from idea to working production code. The browser also automatically pauses CSS animations on hidden tabs, reducing battery drain and CPU cost compared to JavaScript-driven equivalents that need explicit page visibility handling.

When you start a project with a small library of generated CSS animations stored in one shared file, you build a motion system rather than a collection of one-off effects. Naming keyframe rules consistently, reusing the same duration tokens across components, and standardizing on two or three easing curves makes the entire interface feel cohesive without any design system tooling. The animation generator helps enforce this by exposing the same controls every time, so the duration you pick for a fade-in matches the duration you pick for a slide-in unless you deliberately change it. Teams that adopt this approach report fewer motion bugs in QA and faster onboarding for new front-end engineers who need to add animated UI without learning each codebase's ad-hoc conventions from scratch.

MDN: CSS Animations MDN: @keyframes

How to use this tool

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Select an animation type, adjust duration and easing in the controls panel, and watch the preview element update in real time. Click Copy Code when the animation looks right.

How It Works

Step-by-step guide to css animation generator:

1
Choose an animation type
Select the animation category from the panel on the left: fade, slide, bounce, rotate, scale, pulse, or fully custom keyframes. Each preset loads a sensible starting set of values that you can then refine. Picking the closest preset is faster than building every animation from a blank state and helps newcomers learn what each parameter does.
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Adjust timing controls
Set the duration in milliseconds using the slider, choose an easing function from the visual cubic-bezier curve selector, and configure the delay, iteration count, direction, and fill mode. Each control updates the live preview instantly so you can compare timing variants side by side without saving or reloading anything in your editor.
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Preview the result
Watch the preview element animate in real time inside the tool window, and refine the values until the motion feels right at full speed. Hover the preview to replay the animation on demand, and try resizing the preview container to see how the animation behaves at different element widths before committing.
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Copy and paste the code
Click the Copy Code button to copy the complete @keyframes block plus the animation property declaration to your clipboard, then paste both into your CSS file at the appropriate selector. The generated output is unprefixed standard CSS, so it works without any post-processing in modern build pipelines.

Real-world examples

Common situations where this approach makes a real difference:

Landing page entrance animation

A marketing developer uses the generator to create a fade-in with a slight upward translate for a hero section headline. They set 600ms duration, ease-out easing, and a 200ms delay so the headline appears after the page paint. The generated code is pasted directly into the landing page stylesheet, saving the back-and-forth of adjusting timing values in DevTools.

Component library animation tokens

A design system engineer generates five standard animations: fade-in, slide-up, slide-down, scale-in, and scale-out. Each is generated with consistent 250ms duration and ease-out easing, then added to a shared animations.css file. Components across the library reference these keyframe names, keeping motion consistent without duplicating code.

Client prototype demonstration

A freelance designer uses the generator during a client call to try different animation feels for a modal entrance. They adjust easing from linear to ease-out to a custom spring-like cubic-bezier in real time while the client watches, getting buy-in on the motion style before writing a single line of production code.

Bootcamp project portfolio page

A coding bootcamp student adds CSS animations to their portfolio site for the first time. They use the generator to produce a staggered card entrance effect with progressively increasing delays on four project cards. The generator outputs the @keyframes block once and the animation declarations for each card with 0.1s, 0.2s, 0.3s, and 0.4s delays respectively.

When to use this guide

Use this when you need to produce a CSS animation quickly and want to iterate on timing and easing values visually rather than editing code blind.

Pro tips

Get better results with these expert suggestions:

Use animation-fill-mode: both to prevent flashing

When an animation has a positive delay, the element briefly shows its un-animated state before the animation starts. Setting animation-fill-mode: both holds the element at the first keyframe during the delay period, preventing the visible flash. The generator sets this by default, but check it when copying to an existing animation property.

Keep generated keyframes in a dedicated animations file

If you generate several animations for a project, consolidate all @keyframes blocks in a single animations.css file and import it at the top of your main stylesheet. This keeps your component styles focused on layout and color, makes it easy to audit all motion in one place, and prevents duplicate @keyframes names across files.

Test at 0.25x speed using DevTools animation panel

Chrome and Firefox DevTools include an Animations panel that lets you scrub and slow down running CSS animations. After pasting generated code, open the Animations panel and set the playback speed to 25% to inspect each keyframe stop carefully. This reveals timing issues that are invisible at full speed, such as an overshoot that happens too quickly.

Wrap generated animations in a prefers-reduced-motion query

Add @media (prefers-reduced-motion: reduce) around your animation declarations and set animation: none inside it. Users who have enabled reduced motion in their OS settings will see no animation, which is the correct behavior for accessibility. The generator produces the animation code; wrapping it in this query takes 30 seconds and makes the page compliant with WCAG 2.1 guideline 2.3.3.

FAQ

Frequently asked questions

The generator produces two blocks of CSS: a @keyframes rule with the chosen animation name and property values at each percentage stop, and an animation shorthand property for the element you apply the keyframes to. Both blocks are complete, syntactically valid, and ready to paste directly into a stylesheet without any modification. You can reference the @keyframes name in any element's animation property, so one generated keyframe block can be reused across multiple elements with different durations or delays. The generator also outputs the longhand version of the animation shorthand on request, which is useful when you want to override only one sub-property like animation-delay on a specific selector while inheriting everything else from a base class.

No. The generator is designed for both beginners who want working animation code without first learning the full CSS animation specification, and for experienced developers who already know the syntax but want to prototype timing values quickly. The controls map directly to the underlying CSS properties one for one, so using the tool also teaches you what each value does in context. After using the generator a few times, reading and editing the generated code directly becomes straightforward, and many users eventually transition to writing simple animations by hand while still reaching for the visual tool for anything involving custom cubic-bezier curves, multi-stop keyframes, or complex transform sequences where seeing the result matters more than typing speed.

Yes. The generated animation property and @keyframes rule are standard CSS that work on any HTML element. Paste the @keyframes block at the top level of your stylesheet and add the animation property to the selector for the element you want to animate. If you are using a CSS framework, the generated code is compatible with any framework that accepts plain CSS custom classes.

A CSS transition interpolates between two states when a class or pseudo-class changes, typically on hover or focus. A CSS animation plays a defined @keyframes sequence independently, on load, after a delay, or in a loop. The generator produces animation-based code. Use transitions for interactive hover effects that need to reverse cleanly; use animations for sequences that play automatically, loop, or involve more than two states.

Yes. The generator includes a cubic-bezier editor that lets you drag control points to define a custom easing curve. The four numeric values for the cubic-bezier() function update in real time as you adjust the handles, and the generated code uses the custom cubic-bezier() value rather than a named keyword. This gives you precise control over acceleration and deceleration without needing to look up cubic-bezier values manually.

CSS animations using the properties the generator produces (animation, @keyframes, and standard values like ease-in-out, cubic-bezier, and fill modes) are supported in all modern browsers including Chrome, Firefox, Safari, and Edge. Internet Explorer 10 and 11 supported CSS animations with the -ms- prefix, but those browsers are not in active use. The generator produces unprefixed CSS that covers 99% of current browser traffic.

Yes. If you want to make the animation configurable, you can replace hardcoded values in the generated @keyframes or animation property with CSS custom property references. For example, replace the duration value with var(--animation-duration) and declare --animation-duration in a :root block or on the specific element. This lets you adjust animation parameters from a single declaration without modifying the @keyframes rule.

The animation-fill-mode property controls what state the element is in before the animation starts (if there is a delay) and after it ends. A value of both means the element holds the first keyframe state during the delay and holds the last keyframe state after the animation finishes. The generator sets fill-mode: both by default for most animation types, which prevents the common bug where an element flashes its unstyled state before a delayed animation begins. If you only want the post-animation state held, set fill-mode to forwards instead. For animations with no delay that should return cleanly to base styles after playing, leave fill-mode at the default none so the element reverts to its unanimated appearance once the keyframes finish executing.

The generated @keyframes block is plain CSS with percentage stops and property values you can edit by hand without breaking the tool's output. To change the easing curve at a specific stop, add an animation-timing-function declaration inside that keyframe rule. To insert an additional stop, add a new percentage line between existing ones. To rename the keyframes, change the name in the @keyframes declaration and update the animation property on the element to match. The generator does not lock the output to a proprietary format. Everything it produces is standard CSS that integrates with any preprocessor like Sass or PostCSS, any build tool, and any framework that accepts stylesheets, leaving you full control over future edits.

The generator outputs raw CSS, but converting that output into a Sass mixin or a set of CSS custom properties is straightforward. Wrap the @keyframes name, duration, and easing values in mixin arguments, then call the mixin wherever you need the animation applied. For CSS custom properties, declare each timing value (duration, delay, easing curve) as a variable at the :root level and reference those variables in the animation shorthand. This is the recommended pattern for design systems where multiple components share motion tokens. The generator is intentionally framework-neutral so the output composes cleanly with whichever abstraction layer your codebase prefers for shared values.