Text Diff Tool Guide - Find Document Differences Instantly
Table of Contents
Got a revised contract but can’t find what changed?
This guide shows you how to spot every difference in 5 seconds.
No app to install.
No account to create.
Works right in your browser!
Stop wasting time on manual comparisons.
Who Uses This Tool?
Legal Assistant
“Our vendor sent back a 30-page contract revision. Finding changes manually took 2+ hours. With iTool, I spotted all 7 modified clauses in 5 minutes flat.”
Software Developer
“When I get code review feedback, changes aren’t always obvious. Paste the original and revised code - boom, every change highlighted in color. Code reviews are so much easier now.”
Freelance Translator
“I compare English source with my translation side by side. Missing sentences jump out immediately. Essential for quality checks.”
PhD Student
“My advisor’s feedback on drafts was hard to track. Now I compare before and after versions to see exactly what changed. Saves hours of confusion.”
How to Use (3 Steps)
Step 1: Paste Original Text
Enter your original text in the left panel.
Contracts, code, essays - anything works.
Step 2: Paste Revised Text
Put the modified version in the right panel.
Comparison starts automatically as you type.
Step 3: Review Differences
Deleted text shows in red. Added text shows in green.
Switch between side-by-side and unified view modes.
Why Choose iTool?
| Feature | Other Online Tools | Pro Diff Software | iTool |
|---|---|---|---|
| Price | Free~Paid | Paid | Free |
| Installation | None | Required | None |
| Comparison Type | Line-based | Character-based | Character-based |
| Real-time | No | Yes | Yes |
| View Modes | 1 | Multiple | 2 |
| Ads | Many | None | None |
| Privacy | Unclear | Local | 100% Secure |
Key Features
Real-time Highlighting
Results appear instantly as you type.
Deletions get a red background. Additions get green.
Spot changes at a glance without scrolling through pages.
Two View Modes
Side-by-side mode shows original and revised text next to each other.
Unified mode displays all changes in one scrollable view.
Pick whichever fits your workflow.
Built-in Text Tools
Remove extra whitespace or line breaks with one click.
Copy results directly to clipboard.
Reset button starts fresh comparison instantly.
Complete Privacy
Your text never leaves your browser.
All processing happens locally on your device.
Compare confidential documents without worry.
Frequently Asked Questions
Q. Can I compare very long documents?
A. Yes! Handles thousands of lines. Very large files may slow your browser slightly - split them if needed.
Q. Does it work with mixed languages?
A. Absolutely. English, Korean, Chinese, special characters, numbers - all compared accurately.
Q. Does it detect spacing and line break differences?
A. Yes, whitespace changes are detected too. Use the cleanup tools if you want to ignore them.
Q. Can I save the comparison results?
A. Copy the results to clipboard, then paste wherever you need - Word, email, notes app, etc.
Related Tools
- Character Counter - Count words, characters & bytes
- PDF Merge - Combine multiple PDFs into one
- PDF Edit - Rearrange and edit PDF pages
- Image Compress - Reduce image file size
Stop wasting time hunting for changes manually.
Find every difference in seconds with iTool Text Diff!