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How to Use CSS Autoprefixer - Step by Step Guide

Step 1

Input Your CSS Code

Start by entering your CSS code that needs vendor prefixes for cross-browser compatibility.

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Paste CSS: Copy your CSS code and paste it into the input editor
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Modern CSS3: Works with flexbox, grid, transforms, and more
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Try sample: Click "Sample" to test with example CSS
Step 2

Automatic Vendor Prefix Addition

The autoprefixer analyzes your CSS and automatically adds necessary vendor prefixes (-webkit-, -moz-, -ms-, -o-) based on current browser support data.

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Smart detection: Only adds prefixes that are actually needed
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Browser support: Covers all major browsers
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Up-to-date: Uses latest browser compatibility data
Step 3

Copy or Download Prefixed CSS

Your CSS is now ready for production with full cross-browser compatibility! Copy or download the prefixed CSS.

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Copy to clipboard: One-click copying for quick use
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Download file: Save as .css file for your project
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Ready to use: Works in all major browsers

Frequently Asked Questions

What are CSS vendor prefixes?

Vendor prefixes are browser-specific prefixes like -webkit-, -moz-, -ms-, and -o- that allow browsers to implement experimental or non-standard CSS features. They ensure your CSS works across different browsers.

Which CSS properties need vendor prefixes?

Common properties that need prefixes include flexbox, CSS grid, transforms, transitions, animations, gradients, box-shadow, and border-radius. The autoprefixer automatically detects which properties need prefixes.

Do I need vendor prefixes for modern browsers?

While modern browsers support most CSS3 features without prefixes, you still need them for older browser versions and some newer experimental features. Autoprefixer helps maintain backward compatibility.

Can autoprefixer remove unnecessary prefixes?

Yes! Our autoprefixer not only adds necessary prefixes but also removes outdated ones that are no longer needed, keeping your CSS clean and optimized.

Is this CSS autoprefixer free?

Yes, completely free with no registration required and unlimited usage for all your CSS prefixing needs.

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