Text Diff Checker
Original Text
Modified Text
Enter text in both fields and click 'Compare' to see the differences
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About Text Diff Checker
Compare two texts and highlight differences. Supports character, word, and line comparison. Free online diff checker tool.
How to Use
Step 1
Paste your original text in the left text area
Step 2
Paste your modified text in the right text area
Step 3
Select comparison mode: Characters, Words, or Lines
Step 4
Click 'Compare' to see the differences
Step 5
View color-coded diff: green for additions, red for deletions
Step 6
Check statistics to see total additions, deletions, and changes
Step 7
Use 'Swap' button to switch texts, or 'Clear' to start over
Features & Benefits
- ✅3 comparison modes: character, word, and line-by-line
- ✅Color-coded diff view with green (additions) and red (deletions)
- ✅Detailed statistics: additions, deletions, unchanged, total changes
- ✅Character-by-character comparison for precise differences
- ✅Word-by-word comparison for readability
- ✅Line-by-line comparison for code and documents
- ✅Swap button to quickly switch original and modified texts
- ✅Clear button to reset both text areas
- ✅Real-time comparison with instant results
- ✅Longest Common Subsequence (LCS) algorithm for accurate diffs
- ✅Strikethrough styling for removed text
- ✅Highlighted background for added and removed text
- ✅Monospace font for code comparison
- ✅Responsive layout works on all devices
- ✅100% browser-based - text never sent to server
- ✅100% free - no limits, no signup required
FAQs
What is a text diff checker?
A text diff checker compares two texts and highlights the differences between them. It shows what was added (in green), what was removed (in red), and what stayed the same. It's essential for code reviews, document editing, version comparison, and tracking changes.
What's the difference between character, word, and line comparison?
Character mode compares every single character, showing precise differences. Word mode compares word-by-word, making it easier to read for text documents. Line mode compares entire lines, which is best for code, configuration files, and structured documents.
Which comparison mode should I use?
Use Character mode for finding typos and small changes. Use Word mode for comparing articles, essays, and general text. Use Line mode for comparing code, JSON, CSV, logs, and any line-based content.
How does the diff algorithm work?
The tool uses the Longest Common Subsequence (LCS) algorithm to find the longest sequence of matching elements between the two texts. It then identifies additions and deletions based on what's not in the common sequence. This is the same algorithm used by Git and other version control systems.
Can I use this to compare code?
Absolutely! The tool is perfect for comparing code. Use Line mode for the best results. It works great for comparing different versions of code, reviewing changes, finding bugs introduced in updates, or comparing configuration files.
What do the statistics mean?
Additions shows characters/words/lines added in the modified text. Deletions shows what was removed from the original. Unchanged shows what stayed the same. Total Changes is the sum of additions and deletions, giving you the overall magnitude of changes.
Can I compare large texts?
Yes! The tool can handle large texts, though very large files (100,000+ characters) may take a moment to process. For best performance with large files, use Line mode instead of Character mode.
What does the 'Swap' button do?
The Swap button switches the original and modified texts. This is useful when you want to see the diff from the opposite perspective - what was added becomes removed and vice versa.
Can I use this for document version comparison?
Yes! It's perfect for comparing different versions of documents, articles, contracts, or any text. Use Word mode for the most readable comparison of prose text.
Is my text stored or sent to a server?
No! All text comparison happens entirely in your browser using JavaScript. Your texts never leave your device, ensuring complete privacy and security.