About Text Compare & Diff Checker
Text Compare & Diff Checker shows how two text blocks differ by character, word, or line, with options that make meaningful changes easier to review.
The comparison mode should match the change you are reviewing. Line mode is easier for configuration and source files, while word or character mode can reveal a small edit inside a line; whitespace and line-ending settings can change the result substantially.
How to use this developer tool
- Paste the original and revised text into the two panes.
- Choose character, word, or line comparison and set whitespace options deliberately.
- Review additions, removals, and unchanged context, then copy the relevant result or return to the source file for the final edit.
Privacy and data handling
The diff is calculated locally in the browser. Use shortened or redacted samples for logs, documents, and source code that should not be shared with a public service.
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Frequently asked questions
Why does the whole file look changed?
Different line endings, indentation, encoding, or whitespace can make every line appear different. Check the comparison options before judging the content change.
Which comparison mode should I use?
Use line mode for files and configuration, word mode for prose or structured text, and character mode for small values where the exact position matters.
Does a diff prove which version is correct?
No. It shows differences only. Use tests, review, and the source system to decide which version should be kept.