Text Diff Checker

Compare two texts and see differences side-by-side

What is a Text Diff Checker?

A Text Diff Checker is a powerful comparison tool that instantly highlights the differences between two versions of text or code. It visually identifies lines that have been added, removed, or modified, making it incredibly easy to track document revisions or debug code changes.

Code ComparisonDocument DiffRevision Tracking

Why Use a Diff Tool?

  • ✓
    Spot Hidden ErrorsInstantly find typos or missing characters.
  • ✓
    Save TimeAutomate manual line-by-line comparison.
  • ✓
    Review CodeEasily verify logic changes before committing.
  • ✓
    No File Uploads100% private. Everything runs in your browser.

How to Use

Compare your texts in three simple steps

01
📄

Paste Original

Paste the original or older version of your text in the left input box.

02
📝

Paste Modified

Paste the modified or newer version of your text in the right input box.

03
🔍

Review Diff

Scroll down to see the real-time highlighted differences in Side-by-Side or Unified view.

Common Use Cases

💻

Code Reviews

Check changes in source code before merging or deploying.

⚖️

Legal Documents

Identify altered clauses in contracts and legal papers.

⚙️

Configuration Files

Compare working and broken server configurations.

🎓

Plagiarism Checks

Find similarities between two essays or articles.

Comparison Tips

Check Line Endings

Ensure both texts use the same line endings (CRLF vs LF) to prevent false positives.

Use Unified View

For large files, the Unified view helps you focus purely on the changed sections.

Swap Feature

If you pasted texts backwards, use the Swap button to instantly reverse the Diff output.

Green vs Red

Remember: Green (+) means added to the new file, Red (-) means removed from the old file.

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✨

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🛠️

JSON Formatter

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Frequently Asked Questions

Answers to common questions about using our text comparison tool.

A Text Diff Checker (or diff tool) is an application that compares two pieces of text and highlights the exact differences between them, such as added, removed, or unchanged lines.
Added lines are highlighted in green with a plus (+) sign. Removed lines are highlighted in red with a minus (-) sign. Unchanged lines remain in the default color with no prefix.
Manual checking is error-prone and time-consuming. A Diff Tool instantly pinpoints changes, even tiny ones like a single space or missing punctuation, ensuring 100% accuracy.
Yes! All comparisons are done locally in your browser. Your text is never sent to our servers, making it completely safe for confidential code or documents.