Paste HTML and CSS to find unused selectors with coverage reporting and removal suggestions.
CSS Unused Selector Finder compares the selectors in pasted CSS with the elements and attributes present in pasted HTML. It reports which selectors find a match, summarizes selector coverage, and flags unmatched selectors as removal candidates. The important surprise is that "unused" means unused by this HTML snapshot, not unused by an entire application. Selectors activated by script, route changes, injected components, user interaction, or states absent from the sample can be reported as unused even though production needs them.
Paste the markup snapshot and stylesheet into their respective inputs. The finder checks CSS selectors against that markup and separates selectors that match at least one element from those that do not. Its coverage report concerns examined selectors, not downloaded stylesheet bytes, declaration counts, cascade importance, or the amount of CSS that visibly affects the rendered page.
Removal suggestions come from selectors with no match in the supplied HTML. A grouped rule can contain comma-separated selectors with different relevance, so inspect the individual selectors before editing the stylesheet. Keep the original CSS until all applicable templates and states have been checked, because this report cannot establish that an unmatched selector is globally dead.
No. An unmatched selector is only absent from the HTML you supplied. It may match another route, a server-rendered variant, content inserted after load, or a class added during interaction. Treat the suggestion as a candidate, then search the full project and exercise relevant states before deleting the rule.
No. A selector can match an element while all of its declarations are overridden, invalid, or visually irrelevant. Conversely, a selector can be needed for a state missing from the sample. This tool answers whether selectors match the pasted HTML; it does not prove that declarations change pixels or that matched rules are worth keeping.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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