Diff Checker Online
Compare two blocks of text and instantly see the differences. 100% client-side — your data never leaves your browser.
Enter text in both fields and click Compare or press Ctrl+Enter
Keyboard Shortcuts
Why Use This Diff Checker?
Privacy First
All text comparison happens in your browser. Nothing is sent to any server — ever.
Side-by-Side & Inline
View differences in a side-by-side split view or a unified inline view. Switch with one click.
Shareable Links
Generate a permalink to share your diff with teammates — no signup or account needed.
Dark Mode
Easy on the eyes. Toggle dark mode with the header button or follow your system preference.
Keyboard Shortcuts
Power-user friendly with shortcuts for compare, swap, clear, and share.
100% Free
No limits, no accounts, no watermarks. Just paste and compare.
How to Compare Text Files Online
- Paste your original text in the left panel.
- Paste the modified text in the right panel.
- Click Compare or press Ctrl+Enter.
- Review the highlighted differences — green for additions, red for removals.
- Click Share Link to create a permalink you can send to anyone.
What Is a Diff Checker?
A diff checker (or text comparison tool) finds and highlights the differences between two blocks of text. It is commonly used by developers to compare code versions, writers to track document changes, and teams to review configuration updates. Our free online diff tool uses the same algorithm as professional tools like git diff, but runs entirely in your browser for maximum privacy.
Use Cases
- Code review: Compare two versions of source code to spot changes.
- Document editing: Track changes between drafts of contracts, articles, or notes.
- Configuration audits: Find differences between server configs, .env files, or YAML manifests.
- Data validation: Compare CSV or JSON exports to verify data integrity.