Diff Checker
Compare texts side-by-side with highlighted differences
About Diff Checker
Diff Checker is a powerful side-by-side text comparison tool that instantly highlights differences between two documents or code snippets. Whether you are reviewing code changes, comparing document versions, or tracking content modifications, Diff Checker makes it easy to spot what is changed at a glance.
Built entirely in your browser with zero server uploads, Diff Checker processes everything locally on your device for maximum privacy and speed. Perfect for developers, writers, and anyone who needs to understand exactly what changed between two versions of text.
How to use Diff Checker
Paste Your Texts
Enter or paste the original text in the left panel and the modified text in the right panel.
View the Diff
Differences are highlighted automatically in real-time as you type or paste.
Export or Share
Download the comparison report, copy results, or share the analysis with others.
Pro Tips
- Use the unified diff view to see changes in context format, perfect for code reviews and technical documentation.
- Try uploading files directly to compare entire documents without manually copying and pasting.
- Toggle between light and dark mode to reduce eye strain during long comparison sessions.
- Bookmark your comparisons using the browser's native tools to reference changes later without re-uploading.
Key features of Diff Checker
Side-by-side view
View both texts simultaneously with synchronized scrolling for easy comparison.
Highlighted differences
Added, removed, and modified lines are color-coded for instant visual identification.
Line-by-line tracking
See exact line numbers where changes occur to quickly locate modifications.
Copy & paste input
Paste text directly, upload files, or load from URLs for flexible comparison options.
Multiple output formats
Export results as reports, share via link, or download highlighted comparisons.
Blank slate ready
Start fresh with one click to compare new texts without page refresh.
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