Unused CSS: Find and Remove Unused CSS
Unused CSS analyzer that helps you find and remove unused CSS. See coverage per stylesheet so you can ship leaner critical paths.
:hover, .active) and JS-injected classes are normalized — review the cleaned output before shipping.How to use the Unused CSS Finder
- 1Paste your CSS and the rendered HTML into the inputs.
- 2Click Analyze.
- 3Review the list of unused selectors.
- 4Copy the cleaned CSS to your project.
What you can do with the Unused CSS Finder
Find unused CSS on a page.
Lists every selector that doesn't match an element in your HTML.
Remove unused Bootstrap or Tailwind CSS.
Strip ruleset bloat from frameworks before shipping to production.
Clean up CSS after a redesign.
Old utility classes left behind add up — this surfaces them.
Reduce stylesheet size for Core Web Vitals.
Smaller CSS means faster LCP and less render-blocking.
Unused CSS Finder FAQs
Is my code uploaded anywhere?+
No. Analysis runs entirely in your browser.
Why does the result list selectors that are 'used' on other pages?+
The tool only sees the HTML you paste. Run it per page, or paste a representative composite, before removing rules globally.
Does it understand pseudo-classes like :hover?+
It matches base selectors. Pseudo-states for elements that already exist are treated as used.
Will removing unused CSS break my site?+
Only if the page has dynamically added classes. Always test after removal — especially on JS-heavy interfaces.
How much CSS is typically unused?+
30–70% on framework-heavy sites; less on hand-rolled stylesheets.
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