๐ท๏ธ CSS Prefixer
Add vendor prefixes to CSS automatically for cross-browser support. Free, instant, browser-based with no upload.
๐ท๏ธ CSS Prefixer
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About the CSS Prefixer Tool
Vendor prefixes exist because browsers ship experimental CSS features before the specification is final. A property might need -webkit-, -moz-, or -ms- variants alongside the standard form to work everywhere, and remembering which properties still need which prefixes is a genuine maintenance burden.
This tool adds the appropriate prefixes automatically, so your CSS works across browsers without you having to track compatibility tables. Most modern properties no longer need prefixing at all, but several โ particularly around backdrop filters, user selection, and appearance โ still do. Processing runs in your browser.
How to Use CSS Prefixer
- Paste your CSS declarations into the input area.
- Press Convert to add the required vendor prefixes.
- Review the prefixed output.
- Copy the result into your stylesheet.
When to Use This Tool
- Ensuring newer CSS features work in Safari and older browsers
- Preparing a stylesheet for a project with no build pipeline
- Adding compatibility to hand-written CSS quickly
- Supporting a legacy browser requirement on an enterprise project
- Fixing a feature that works in Chrome but not Safari
Things Worth Knowing
- Always place the unprefixed standard property last, so it takes precedence once supported.
- Most widely supported properties no longer need prefixes โ prefixing everything bloats your CSS unnecessarily.
- In a build pipeline, Autoprefixer with a browserslist configuration is the more maintainable approach.
Quick Facts
| Tool name | CSS Prefixer |
| Category | Developer Tools |
| Price | Free โ no account, no trial, no watermark |
| Where it runs | Entirely in your browser (client-side) |
| Files uploaded | None โ your data never leaves your device |
| File size limit | None imposed; limited only by device memory |
| Works offline | Yes, once the page has loaded |
| Platforms | Windows, macOS, Linux, Android, iOS |
Frequently Asked Questions
Which properties still need prefixes?
Mainly backdrop-filter, user-select, appearance, and some newer or non-standard features. Grid, flexbox, transforms, and transitions are universally supported unprefixed in current browsers.
Why does the standard property go last?
CSS applies the last matching declaration. Putting the unprefixed version last means browsers that support the standard implementation use it, while older ones fall back to their prefixed variant.
Do I still need prefixes in 2026?
Far less than a few years ago. Most common properties are fully supported. Check caniuse.com for a specific property rather than prefixing everything by default.
Is this the same as Autoprefixer?
Similar in purpose. Autoprefixer integrates with your build and uses a browserslist config to decide precisely what to add. This tool is the quick manual equivalent for one-off use.