Text Diff Checker
Compare two text blocks and see differences highlighted line-by-line.
Original Text
Modified Text
🔒 Privacy: Text comparison is done entirely in your browser. No data is uploaded to any server.
What is a Diff Checker?
A diff checker (difference checker) compares two pieces of text and highlights the differences between them. It's an essential tool for developers reviewing code changes, writers comparing document versions, or anyone needing to identify what changed between two text files.
How to Use This Diff Checker
- Paste Original: Enter your original text in the left panel
- Paste Modified: Enter the modified text in the right panel
- Compare: Click "Compare Text" to see differences
- Review Changes: Green lines are additions, red lines are removals
Common Use Cases
- Code Review: Compare code before and after changes
- Document Comparison: See what changed between document versions
- Configuration Files: Compare config files to spot differences
- API Responses: Compare API output between versions
- Database Queries: Compare SQL queries or results
- Contract Review: Identify changes in legal documents
- Merge Conflicts: Understand Git merge conflicts
Features
- ✅ Line-by-Line Comparison: Clear visualization of differences
- ✅ Color-Coded Changes: Green for additions, red for removals
- ✅ Statistics: Count of added, removed, and changed lines
- ✅ Side-by-Side View: Easy comparison of both texts
- ✅ Responsive Design: Works on mobile and desktop
- ✅ 100% Client-Side: No server, no data upload
Understanding the Results
- Green Lines (Additions): Lines that exist in the modified text but not in the original
- Red Lines (Removals): Lines that exist in the original but were removed in the modified text
- Gray Lines (Unchanged): Lines that are identical in both texts
Tips for Effective Comparison
- Normalize Whitespace: Ensure consistent spacing for accurate results
- Line Breaks: Make sure both texts use the same line break style
- Character Encoding: Use UTF-8 encoding for special characters
- Format Code: Format code consistently before comparing
Privacy & Security
All text comparison is done locally in your browser using JavaScript. No data is sent to our servers or any third-party service. Your text remains completely private.
Related Tools
- JSON Formatter - Format JSON before comparing
- Markdown Preview - Preview markdown differences
- HTML Formatter - Format HTML before diff