How does the diff algorithm work?

The tool compares texts line by line. Lines present only in the first text are marked as deletions (red). Lines present only in the second text are marked as additions (green). Matching lines are shown unchanged.

Yes. The diff checker works with any text including source code, JSON, configuration files, and plain text. It preserves whitespace and indentation.

Text Diff Checker

Compare two texts side by side and highlight differences.

Original

Changed

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FAQ

How does the diff algorithm work?: The tool compares texts line by line. Lines present only in the first text are marked as deletions (red). Lines present only in the second text are marked as additions (green). Matching lines are shown unchanged.
Can I compare code?: Yes. The diff checker works with any text including source code, JSON, configuration files, and plain text. It preserves whitespace and indentation.

The Text Diff Checker compares two texts line by line and highlights additions, deletions, and unchanged lines. Useful for comparing code versions, configuration changes, API responses, and document revisions. All comparison happens in your browser.