CSS Diff Tool

Compare two CSS snippets free online and see exactly which lines changed. Real line-by-line diff highlighting additions and removals, ignoring whitespace noise.

How to Use This Tool

1
Paste your original CSSOn the left
2
Paste the modified CSSOn the right
3
Click CompareSee exactly which lines changed

Line-by-Line Comparison, Generic Text Diff

This compares both CSS blocks line by line, flagging lines present in one but not the other as added or removed -- a generic text-diff approach rather than CSS-aware parsing, meaning it compares exactly what's written rather than understanding selector or rule semantics underneath.

Watch Out for Whitespace and Reformatting Noise

If one version was reformatted (different indentation, spacing) by a tool or editor, nearly every line can appear "changed" even when the actual CSS rules are functionally identical -- worth keeping in mind when interpreting a noisy-looking diff result.

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Frequently Asked Questions

It performs a line-by-line diff comparison, treating each line as a unit to compare -- lines present in one version but not the other are flagged as added or removed, while unchanged lines are shown without highlighting.
This performs a generic line-based text diff rather than CSS-aware parsing, meaning it compares lines as written rather than understanding selector or property semantics -- reordered but otherwise identical rules would show as changes even though they'd produce the same visual result.
Inconsistent indentation or spacing between two CSS versions (especially if one was reformatted by a different tool) can make every line appear changed even when the actual rules are identical -- a common frustration with naive diff tools applied to reformatted code.
Reviewing what actually changed before merging a CSS update, comparing two versions of a stylesheet after a refactor, or checking exactly what a build tool's minification or autoprefixing process altered.
Yes, the line-based comparison algorithm handles files of substantial size, though for very large stylesheets, the resulting diff output itself may be lengthy to review manually.
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