Diff Checker

Compare two text blocks and highlight differences

Original Text

Modified Text

Enter two text blocks above and click "Compare Texts" to see the differences.

What is a Diff Checker?

A diff checker (or text comparison tool) is a utility that analyzes two blocks of text and identifies the differences between them. It highlights additions, deletions, and modifications line by line, making it easy to see what has changed. This tool is essential for developers, writers, editors, and anyone who needs to track changes in documents or code.

How to Use the Diff Checker

  1. Paste Original Text - Enter your original or "before" text in the left textarea.
  2. Paste Modified Text - Enter the changed or "after" text in the right textarea.
  3. Click Compare - Press the "Compare Texts" button to analyze differences.
  4. Review Results - View differences in side-by-side or inline format.
  5. Toggle Views - Switch between comparison modes using the toggle buttons.

Understanding the Results

Green (Added)

Lines that exist in the modified text but not in the original.

Red (Removed)

Lines that existed in the original but were removed.

Yellow/Blue (Changed)

Lines that were modified between versions.

White (Unchanged)

Lines that remain the same in both texts.

Why Use a Diff Checker?

  • Code Review - Compare code versions to review changes before merging.
  • Document Editing - Track revisions in contracts, articles, or reports.
  • Configuration Files - Identify changes in config files or settings.
  • Debugging - Find unintended changes that may have caused bugs.
  • Version Control - Understand what changed between file versions.
  • Plagiarism Detection - Compare texts for similarity.

FAQ

What's the difference between side-by-side and inline view?

Side-by-side shows both texts in parallel columns, making it easy to compare line by line. Inline view shows a unified diff with additions and deletions marked in a single column.

Can I compare files directly?

Currently, you need to copy and paste the file contents. Simply open your files, copy the text, and paste it into the text areas.

Is there a size limit for comparison?

While there's no strict limit, very large texts may take longer to process. For best performance, compare files under 100KB.