Text Diff Checker
Compare two texts line by line and highlight added and removed lines.
Original Text
Changed Text
Related Tools
Text Diff: Spot Every Change Between Two Versions
A diff tool answers a simple but constant question in development and writing: what exactly changed? Instead of eyeballing two documents side by side, a line-based diff highlights every added and removed line instantly.
1. When a Diff Tool Saves You
- Code review: compare a snippet before and after a refactor without committing.
- Config changes: verify exactly which keys changed between two environment files.
- Document versions: find edits between two drafts of a contract or article.
- API responses: compare two JSON payloads to spot a regression.
2. How Line Diff Works
This tool computes the Longest Common Subsequence (LCS) of the two texts' lines — the same foundation used by git diff. Lines present only in the original are marked as removed (−), lines present only in the changed text are marked as added (+).
3. Privacy by Design
Everything runs locally in your browser. No text is uploaded, stored, or logged — which makes this tool safe for proprietary code and confidential documents.