Text Diff Tool

What is Text Diff Tool?

Text Diff Tool is an online tool that compares two texts line by line and visually displays the differences. By placing the original text and modified text side by side, you can easily identify added, deleted, and modified sections with color coding.

It supports file upload functionality, allowing you to compare texts directly in your browser without installing any software. Options to ignore whitespace or case differences are also provided for flexible comparison according to your needs.

Use Cases

• Code Review – Check changes between versions of source code
• Document Version Control – Track revision history of contracts, reports, etc.
• Translation Verification – Compare original and translated text to find omissions
• Configuration File Comparison – Check differences in server settings, environment variables, etc.
• Data Validation – Verify the consistency of two datasets
• Proofreading – Compare text before and after editing to see changes

Key Features

• Side-by-Side Comparison – View original and modified text side by side for intuitive comparison.
• Line-by-Line Comparison – Uses the LCS (Longest Common Subsequence) algorithm for accurate line-level comparison.
• Color-Coded Display – Added (green), removed (red), and modified (yellow) sections are color-coded for easy identification.
• Ignore Whitespace/Case – Options to ignore whitespace or case differences to focus on actual content changes.
• File Upload – Easily load various text files like txt, md, json, xml via drag and drop.
• Change Statistics – Automatically tallies added, removed, modified, and unchanged line counts.
• Difference Navigation – Navigate quickly between differences using Prev/Next buttons.
• Scroll Synchronization – Original and modified panels scroll together to view the same position.

How to Use

1. Enter Text – Enter the original text on the left and modified text on the right. You can also upload files using the upload button.
2. Set Options – Select “Ignore Whitespace” or “Ignore Case” options if needed.
3. Run Comparison – Click the “Compare” button to display differences with color coding.
4. Review Results – Check overall changes in the summary and navigate through each difference using Prev/Next buttons.
5. Use Results – Copy the comparison result as text using the “Copy Result” button.

Comparison Method Explained

What is Line-by-Line Comparison?

Text Diff Tool performs comparison at the line level. Each line is treated as an independent unit to calculate differences between original and modified texts. This method is most suitable for comparing code and structured text.

LCS Algorithm

This tool uses the LCS (Longest Common Subsequence) algorithm. This algorithm finds the longest sequence that appears in both texts, showing only the minimum necessary changes.

Change Types

• Added – New lines that didn’t exist in the original were added to the modified version
• Removed – Lines from the original were deleted in the modified version
• Modified – Line content was changed (consecutive delete+add patterns detected)
• Unchanged – Lines with identical content

Frequently Asked Questions