Free text tool
Text Diff Checker
Paste two versions of text and instantly see what changed. Added, removed, and unchanged lines are highlighted in color. Everything runs locally in your browser — nothing is uploaded.
Paste two texts above and click Compare.
Privacy note: all comparison happens locally. Perfect for drafts, code reviews, configs, and rephrasing.
How to compare text differences
Paste your original text in the left box and the modified version in the right box, then click Compare texts. The diff checker highlights:
- Red — removed lines (present in original, missing in modified)
- Green — added lines (new in modified)
- No highlight — unchanged lines (same in both)
The comparison uses a line-by-line diff algorithm (LCS-based) that runs entirely in your browser.
When to use a text diff checker
- Draft editing: See what changed between versions of an article, email, or document.
- Code review: Compare two code snippets to spot changes quickly.
- Config tracking: Check differences between old and new config files.
- Proofreading: Verify that only intended changes were made.
Is my text uploaded?
No. The diff computation happens locally in your browser. TinyToolbox never sees, stores, or transmits your text. No signup needed.