CSS Prefix Gen
Add vendor prefixes.
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How to Use the CSS Autoprefixer
Paste your raw, un-prefixed CSS code directly into the input area.
Select which target browser prefixes you want to generate (such as WebKit, Mozilla, or Microsoft).
Click "Add Vendor Prefixes" to instantly generate your cross-browser compatible CSS ready to copy.
Features & Benefits
100% Privacy Preserved
All CSS parsing and prefixing operations occur entirely within your browser. Your proprietary stylesheets are never uploaded to remote servers.
Instant Execution
Leveraging an efficient JavaScript-based parsing engine, the tool processes and injects vendor prefixes instantaneously without network latency.
Broad Compatibility
Automatically detects and prefixes properties requiring vendor support, including Flexbox, CSS Grid, Transforms, Transitions, and Animations.
Customizable Output
Toggle specific legacy prefixes (like `-o-` for old Opera versions or `-ms-` for Internet Explorer) on or off depending on your project's browser support requirements.
Frequently Asked Questions
What is a CSS vendor prefix?
A vendor prefix (like -webkit- or -moz-) is a way for browser makers to add support for new or experimental CSS features before those features are fully adopted and standardized across all browsers.
Which properties are automatically prefixed?
The tool supports standard prefixing for Flexbox properties (handling syntax differences between modern WebKit and legacy MS implementation), Transforms, Transitions, Animations, Filters, Backface Visibility, and Column layouts.
Is my CSS uploaded anywhere?
No. The processing happens entirely locally on your device via JavaScript. Zero data is transmitted over the internet, ensuring your source code remains secure.
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