Lightning Fast
Real-time CSS analysis in your browser. No server uploads, no waiting. Results in under 1 second.
Remove Unused CSS Online
Free online tool to analyze and remove unused CSS from your HTML and Tailwind CSS projects. Clean unused selectors, reduce CSS file size, and improve website performance instantly.
How to Remove Unused CSS Online
Use this free online unused CSS remover to analyze your stylesheet, detect unused selectors, and generate optimized CSS instantly. Just paste your CSS and HTML, run the analysis, and copy the cleaned output. No signup, no installation, and no server upload required.
1️⃣
Paste Your CSS Code
Copy your stylesheet and paste it into the CSS input box. You can test regular CSS, utility-first CSS, component styles, or custom Tailwind-related classes.
2️⃣
Add Your HTML Markup
Paste the HTML that uses your styles. The tool scans class names, IDs, and tag selectors from your markup to identify which CSS selectors are actually in use.
3️⃣
Analyze Unused Selectors
Click Analyze CSS to compare your CSS selectors against your HTML. The tool will show total selectors, used selectors, unused selectors, and estimated file size savings.
4️⃣
Copy Optimized CSS
Switch to Remove Unused mode to view the optimized CSS output. Then copy the cleaned stylesheet and use it in your project to reduce unused code and improve page performance.
Best Ways to Use This Tool
This unused CSS checker is ideal for debugging bloated stylesheets, reviewing Tailwind CSS output, testing landing page performance, auditing HTML and CSS snippets, and cleaning up old frontend code before deployment. Because everything runs directly in your browser, your CSS and HTML stay private while you optimize your code.
Why Use This Tool?
100% Private
All processing happens in your browser. Your CSS and HTML never leave your device.
Tailwind Optimized
Perfect for analyzing Tailwind CSS projects. Debug purge issues and verify JIT mode configuration.
Frequently Asked Questions
What is unused CSS and why should I remove it?+
Does this work with Tailwind CSS?+
Can I analyze multiple pages at once?+
Is my CSS and HTML data stored or sent to a server?+
What CSS features are supported?+
Ready to Optimize Your CSS?
Reduce bundle size, improve performance, and deliver faster web experiences.
Share This Tool
Explore More Tools
CSS & JS MinifierMeta Tag GeneratorCSS MinifierCSS & JS UnminifierJS UnminifierHTML List GeneratorImage to TextImage CropperHash GeneratorPassword GeneratorBroken Link CheckerExcel to SQLSitemap to ExcelReverse TextCursive TextBold TextFake Word GeneratorRepeat TextAPI TesterPDF EditorText to ASCIIJSON FormatterJSON to CSVJSON to XMLCode BeautifierRegex TesterBase64 EncoderHTML to PDFJSON To PHP Array ConverterJSON To JAVAReact Component GeneratorMultiline To Single LineSQL Query FormatterImage CompressorSQL Query GeneratorCSV Cleaner