Diff Checker
Compare two texts and find differences. Additions are highlighted in green, deletions in red.
🔍 What Is a Diff Checker?
A diff checker compares two blocks of text and highlights the differences between them. Lines that were added appear in green, lines that were removed appear in red, and unchanged lines are shown normally. It works like git diff but in your browser.
Essential for code reviews, document revisions, contract comparisons, and any situation where you need to see exactly what changed between two versions of text.
🎯 Use Cases
💻 Code Reviews
Compare code changes before and after edits to spot bugs, regressions, or unintended modifications.
📝 Document Revisions
Track changes in essays, articles, contracts, and legal documents between drafts.
⚙️ Config Comparison
Compare configuration files between environments (dev, staging, production).
📊 Data Validation
Compare data exports to find added, removed, or modified records between runs.
❓ Frequently Asked Questions
How does the diff algorithm work?
The tool compares texts line by line, matching identical lines and flagging additions (lines only in the right text) and deletions (lines only in the left text). Changed lines appear as a removal followed by an addition.
Is my text stored or sent to a server?
No. All comparison happens locally in your browser. Your text never leaves your device.
Is this tool free?
Yes, 100% free. No account, no ads, no limits.