Paste two versions of a text and see additions, deletions, and changes highlighted inline. Useful for code diffs, contracts, and edits.
Our Text Diff Checker compares two texts and highlights additions, deletions, and common words. Ideal for comparing document versions, proofreading edits, or verifying changes. Word-level comparison makes it easy to see exactly what changed between two versions.
The diff algorithm runs in client-side JavaScript, so both text inputs remain in your browser and are never transmitted externally. Paste both texts and click Compare to see additions (in text 2 only), deletions (in text 1 only), and common words.
Key Features
Word-level comparison
Additions & deletions
Similarity score
100% client-side
No registration
How to Use
Paste the first (original) text into the left input area.
Paste the second (modified) text into the right input area.
Click 'Compare Texts' to see additions, deletions, and common words.
Review the comparison. Use Clear All to start with new texts.
FAQ
What is word-level vs character-level diff?
Our tool compares by words. Additions are words in text 2 but not text 1; deletions are words in text 1 but not text 2. For character-level diff, use a dedicated diff tool.
Are my texts transmitted when comparing them?
No. The diff algorithm runs in client-side JavaScript, comparing both inputs character-by-character in browser memory. Neither text block is ever sent to a server.
Does the tool handle large documents?
Yes. The tool processes text in memory. Very large inputs (e.g., 100k+ words) may slow down the browser. For best results, compare reasonable document sizes.