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Diff Checker
Compare two texts side-by-side with highlighted differences — additions, deletions, and unchanged lines.
Diff Checker
Side-by-Side • Line-by-Line • Instant Results
Original
Modified
How to Use
- Paste your original text in the left textarea (Original).
- Paste the modified/updated text in the right textarea (Modified).
- Click Compare (or press Ctrl+Enter) to see the differences highlighted instantly.
- Green lines indicate additions (content present in Modified but not Original).
- Red lines indicate deletions (content present in Original but removed in Modified).
- Gray lines are unchanged. Line numbers on each side show alignment.
- Use Swap to exchange the two text areas, or Clear All to reset.
Tip: The diff uses a line-based algorithm (LCS — Longest Common Subsequence). It works best for comparing similar texts with localized changes.