Text Diff Checker
Visually compare and check differences between two texts
What is Text Diff Checker
Text Diff Checker is a tool that compares two texts and visually displays their differences. It's useful for reviewing document changes or identifying code modifications. Added sections are highlighted in green, deleted sections in red, allowing you to understand changes at a glance.
How to Use
Enter Text
Enter or paste the original text in the left text area and the modified text in the right text area.
Run Comparison
Click the 'Compare' button to automatically calculate and display the differences between the two texts.
Review Results
View diff results in side-by-side or unified display mode. Statistics showing added, removed, and unchanged lines are also displayed.
A practical example
Check what changed between two drafts. Paste the earlier and revised text into separate fields and review the highlighted differences before approving the edit.
Key Features
Visual Diff Display
Added content is highlighted in green, deleted content in red, making changes immediately visible.
Two Display Modes
View differences in either side-by-side or unified display mode according to your preference.
Line Number Display
Each line is numbered for easy reference to specific changes.
Diff Statistics
Automatically counts added, removed, and unchanged lines to show the scale of changes.
Fast Diff Calculation
Efficient algorithms enable fast diff calculation even for large texts.
Frequently Asked Questions
When can I use this tool?
It's useful for document proofreading, code reviews, contract change verification, translation comparison, and many other scenarios.
Can it compare large files?
Yes, thanks to efficient algorithms, it can quickly compare texts with thousands of lines.
Can I save the comparison results?
In the current version, you can save results as PDF using your browser's print function.
Can it compare non-English languages?
Yes, it can compare texts in any language including Chinese, Korean, and Japanese. Full Unicode support ensures even emojis are processed correctly.
Is my privacy protected?
Yes, all processing happens in your browser. No text is sent to any server.