CSS Diff Tool - Compare Stylesheets Online

Compare CSS stylesheets with highlighted differences. Line-by-line comparison shows additions, deletions, modifications. Browser-based and private.

Original CSS

Modified CSS

Format CSS before comparing

Ignore whitespace

Show line numbers

Show inline word changes

Differences

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Frequently Asked Questions

CSS diff tools help you compare two stylesheets to see what changed between versions. Perfect for code reviews, debugging style conflicts, tracking CSS refactoring, or understanding differences between original and minified files.

Green highlights show additions (new CSS rules in the second file), red shows deletions (rules removed from the first file), and yellow shows modified lines where the rule exists in both but changed. Inline word changes appear with darker highlighting.

Yes. Enable 'Format CSS' to automatically prettify both stylesheets before comparison. This adds proper indentation and spacing, making it easier to spot actual code changes rather than formatting differences.

Yes. All comparison and formatting happens entirely in your browser using JavaScript. No CSS code is sent to any server. Safe for comparing proprietary stylesheets or confidential client code.

When enabled, the tool ignores differences caused only by spaces, tabs, and line breaks. This is useful when comparing minified vs formatted CSS, or when indentation styles differ but the actual code is the same.

Yes. Enable 'Show inline word changes' to see exactly which words, properties, or values changed within modified CSS rules. Added text appears in green, deleted text in red with strikethrough.

Line numbers from both stylesheets are shown next to each line when enabled. This helps reference specific rules when discussing changes. You can disable line numbers when copying the diff output.

Yes. Click 'Swap CSS' to reverse which stylesheet is treated as the baseline and which is the comparison. This flips the diff perspective (additions become deletions and vice versa).

The statistics show counts of lines added, deleted, modified, and unchanged. This gives you a quick overview of how much CSS changed between versions, useful for estimating review effort.

Absolutely. Compare CSS extracted from websites, exported from design tools, generated by preprocessors (Sass/Less), or hand-written stylesheets. The tool works with any valid CSS syntax including modern features, vendor prefixes, and CSS custom properties.

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