Online Text Comparison Tool
Our free text diff checker allows you to compare two texts and instantly see what has changed between them. The tool highlights additions (lines present in the modified text), deletions (lines removed from the original), and unchanged content. Perfect for comparing document versions, tracking changes, reviewing edits, and identifying differences between any two text files.
What is Text Diff?
Text diff (short for "difference") is a comparison between two texts that shows what has been added, removed, or kept the same. It's widely used in software development, content editing, document version control, and collaborative writing. Our tool uses an improved line-by-line comparison algorithm to accurately identify changes between texts.
Common Use Cases
- Document Comparison: Compare different versions of contracts, reports, or articles
- Code Review: Compare code changes before and after modifications
- Content Editing: Track changes between draft versions of written content
- Version Control: Identify differences between file versions
- Plagiarism Detection: Compare texts to find similarities and differences
- Translation Review: Compare original and translated texts
- Merge Conflicts: Resolve conflicts when combining text from different sources
Features
- ✓ Line-by-Line Comparison: Accurate detection of added, removed, and unchanged lines
- ✓ Instant Results: See differences immediately as you compare
- ✓ Clear Visualization: Color-coded results for easy identification
- ✓ Copy & Download: Export diff results for documentation
- ✓ Side-by-Side View: Compare texts in separate panels
- ✓ Statistics: See exact count of additions and deletions
- ✓ 100% Private: All processing happens locally in your browser
- ✓ No File Size Limits: Compare texts of any length
How It Works
Our text diff tool uses an improved comparison algorithm that analyzes both texts line by line. It identifies which lines are present in both texts (unchanged), which lines exist only in the first text (removed), and which lines exist only in the second text (added). The algorithm handles duplicate lines intelligently and provides accurate diff results even for complex text changes.
How to Use
- 1. Paste your original text in the left panel
- 2. Paste your modified text in the right panel
- 3. Click "Compare Texts" to see the differences
- 4. Review added lines (green), removed lines (red), and unchanged lines
- 5. Copy results or download the diff report
Tips for Best Results
- • Ensure consistent line breaks in both texts for accurate comparison
- • Remove unnecessary whitespace if you want to focus on content changes
- • Use the tool multiple times to compare different sections
- • Download results for documentation and reference
Security Note: This tool processes all data locally in your browser. Your texts are never uploaded to any server or stored anywhere. This ensures complete privacy and security for sensitive documents.
Frequently Asked Questions
How does the diff algorithm work?
Our improved algorithm compares texts line by line, identifying which lines are present in both texts (unchanged), which exist only in the original (removed), and which exist only in the modified version (added). It handles duplicate lines intelligently using position tracking.
Can I compare large documents?
Yes, there are no file size limits. The tool can compare texts of any length. All processing happens in your browser, so performance depends on your device's capabilities.
What's the difference between character-level and line-level diff?
Our tool uses line-level diff, which compares texts line by line. This is ideal for documents, code, and structured text. Character-level diff would compare every single character, which is less practical for most use cases.
Can I download the diff results?
Yes! Click the "Download" button to save the comparison results as a text file. The file includes all added lines, removed lines, and unchanged lines clearly labeled.
Is this tool suitable for comparing code?
Absolutely! The line-by-line comparison is perfect for code review and identifying changes between code versions. Many developers use it to quickly spot differences before committing changes.