Can I compare code files with this diff tool?

Yes. This tool works for code files too. For code comparison, it's recommended to disable 'ignore spaces' since languages like Python are indentation-sensitive. Best results with files under 100 lines. For larger code files, consider dedicated diff tools or IDE-integrated comparison features.

Text Diff Tool - Free Online Diff Checker

Q: How do I read the diff output colors?

Green background = lines only in the left text (removed); Red background = lines only in the right text (added); White background = identical lines; Yellow highlights = character-level differences within matching lines. This color scheme matches Git's diff display. Hover over highlighted sections to see the exact changes.

Q: What's the difference between ignore spaces and ignore case?

Ignore spaces trims whitespace from line ends before comparison — useful when formatting differences don't affect content. Ignore case treats uppercase and lowercase as identical — useful when checking content consistency across different formats. Both can be enabled together for the most lenient comparison.

Q: How does the diff algorithm work?

This tool uses an improved LCS (Longest Common Subsequence) algorithm. It first finds the longest sequence of matching lines between the two texts, then identifies remaining additions and deletions. For matching lines, it performs character-level comparison for inline diff highlighting. Time complexity is O(n*m), efficient for typical text sizes.

📖 Frequently Asked Questions

What is a text diff tool used for?

A text diff tool compares two texts line by line to find differences. Common uses: comparing code version changes, checking document modifications, validating config file changes, comparing data export results, checking translation consistency, and understanding collaborative changes.

How do I read the diff output colors?

Green background = lines only in left text (removed); Red background = lines only in right text (added); White = identical lines; Yellow highlights = character-level differences. This matches Git's diff display.

What's the difference between ignore spaces and ignore case?

Ignore spaces trims whitespace before comparison. Ignore case treats uppercase/lowercase as identical. Both can be enabled together.

Can I compare code files?

Yes. Disable 'ignore spaces' for indentation-sensitive languages. Best results under 100 lines.

How does the diff algorithm work?

Uses an improved LCS (Longest Common Subsequence) algorithm to find matching lines, then identifies additions/deletions with character-level inline diff highlighting.

Text Diff Tool