CSS Duplicate Checker Tool
Analyze your CSS for errors and duplicate rules by selecting one of the three input options below.
The analyzer detects empty declarations alongside repeated classes, IDs, tags, pseudo-elements, and media queries.
CSS Input Options
CSS Analysis Results
- Repeated class and ID selectors (e.g., .class, #id)
- Redundant HTML tag selectors (like div, span, p)
- Overlapping pseudo-classes (:hover, :focus) and pseudo-elements (:before, :after)
- Blank rule blocks (selectors missing properties or assigned values)
- Identical @media query conditions
- Syntax errors and risky CSS formatting patterns
