Text Diff Checker
Compare two texts side by side and see the differences highlighted. Find added, removed, and unchanged lines instantly. Free, private, no signup.
How to Compare Two Texts and Find Differences
Open the Text Diff Checker
Navigate to the tool. No account or installation needed.
Paste your texts
Enter the original text in the left panel and the modified text in the right panel.
Click Compare
The tool analyzes both texts line by line and highlights all differences.
Review the results
Green shows added lines, red shows removed lines, white shows unchanged lines.
Pro Tips
- •Use the Swap button to quickly reverse which text is treated as original vs modified.
- •The diff is computed line by line. Each line is compared as a whole unit.
- •For code comparison, ensure consistent line endings to avoid false differences.
- •The statistics bar shows totals of added, removed, and unchanged lines at a glance.
When to Use Text Diff Checker
Code review
Compare two versions of source code to see exactly what changed between revisions.
Document revisions
See what was added or changed between two drafts of a document or contract.
Configuration debugging
Compare two config files to find the setting causing different behavior.
Frequently Asked Questions
How does the comparison work?
The tool uses the Longest Common Subsequence algorithm to find the optimal alignment, then highlights additions and removals.
Can I compare code files?
Yes. The tool uses monospace font and preserves whitespace, making it suitable for code and config files.
Is there a text length limit?
No hard limit. Very large texts may take a moment to process since the diff algorithm runs in your browser.
Text Diff Checker vs Alternatives
Text comparison is essential for developers, writers, and anyone working with document revisions.
DiffChecker.com
Popular online diff tool
Key difference: Uploads text to servers. Free tier has ads and limited history.
VS Code
Code editor with built-in diff
Key difference: Requires software installation. Overkill for quick text comparison.
Compare texts instantly in your browser. No uploads, no account, no software. Color-coded results with line numbers. Works on any device.
Key Features
100% Free
No hidden fees, no premium tiers, no limits on how much you use it. Free today, free tomorrow, free forever.
Complete Privacy
Your files never leave your device. Everything is processed locally in your browser — we physically cannot access your data.
No Registration
Start using the tool immediately. No account, no email, no personal information required. Just open and use.
Works Everywhere
Compatible with Chrome, Firefox, Safari, and Edge on desktop and mobile. Works offline once the page has loaded.