About Diff Checker
Our free online diff checker helps you compare two texts or code files side-by-side with highlighted differences. Perfect for developers reviewing code changes, writers comparing document versions, or anyone needing to spot differences between two texts.
Key Features
- 🔍 Multiple Comparison Modes: Character, word, and line-level diff
- 📊 Two View Modes: Split view (side-by-side) and unified view (git-style)
- 🎨 Color-Coded Highlighting: Green for additions, red for deletions
- ⚙️ Smart Options: Ignore whitespace and case sensitivity
- 📈 Detailed Statistics: Count additions, deletions, and unchanged content
- 💾 Auto-Save: Your text is saved locally for convenience
- 📋 Copy & Download: Export diff results easily
- 🔒 100% Private: All processing happens in your browser
How to Use
- Paste your original text in the left textarea
- Paste your modified text in the right textarea
- Choose your comparison mode (lines, words, or characters)
- Select view mode (split or unified)
- Adjust options like ignore whitespace or case
- View highlighted differences instantly
- Copy or download the diff result
Comparison Modes Explained
- Lines Mode: Best for comparing code or structured text. Shows differences line by line.
- Words Mode: Ideal for prose and documents. Highlights word-level changes.
- Characters Mode: Most detailed view. Shows every single character change.
View Modes
- Split View: Shows original and modified text side-by-side for easy comparison
- Unified View: Git-style diff with + and - indicators, similar to version control systems
Use Cases
- 💻 Code Review: Compare code changes before committing
- 📝 Document Comparison: Track changes in contracts, essays, or articles
- 🔄 Version Control: See what changed between file versions
- ✏️ Proofreading: Compare edited vs original text
- 📋 Data Validation: Verify data transformations
- 🔍 Debugging: Find differences in configuration files
- 📊 Content Updates: Track website or documentation changes
Tips for Best Results
- ✓ Use Lines mode for code and structured text
- ✓ Use Words mode for natural language documents
- ✓ Use Characters mode when you need to see every tiny change
- ✓ Enable Ignore whitespace to focus on content changes
- ✓ Enable Ignore case for case-insensitive comparison
- ✓ Use Split view to see both versions simultaneously
- ✓ Use Unified view for a compact, git-style diff
Why Use Our Diff Checker?
- ⚡ Instant Results: Real-time comparison as you type
- 🎯 Accurate: Uses industry-standard diff algorithms
- 🎨 Beautiful UI: Clean, modern interface with color-coded highlights
- 🔒 Private: No server uploads, all processing is local
- 💾 Convenient: Auto-saves your text for later use
- 📱 Responsive: Works on desktop, tablet, and mobile
- 🆓 Free: No limits, no sign-up, no watermarks
Frequently Asked Questions
What is a Diff Checker?
A Diff Checker is a tool that compares two pieces of text or code and highlights the differences between them, typically showing additions in green and deletions in red.
Is my text data private when using this tool?
Yes, our Diff Checker processes all text locally in your browser. We never upload your text to our servers, ensuring your data remains completely private.
What is the difference between Split and Unified view?
Split view shows the two texts side-by-side, which is great for visual comparison. Unified view combines them into a single list with '+' and '-' markers, similar to how 'git diff' works.
Can I ignore changes in spaces or capitalization?
Yes, you can enable 'Ignore Whitespace' to overlook changes in tabs and spaces, or 'Ignore Case' to make the comparison case-insensitive.
Does this tool support large files?
Our tool can handle large blocks of text effectively. However, extremely large files might be limited by your browser's memory and processing power.
Privacy & Security
Your text comparison is processed entirely in your browser using JavaScript. We never upload, store, or transmit your text to any server. Your data remains completely private and secure on your device. The auto-save feature uses your browser's local storage only.