Text Diff Checker
Paste two texts, instantly see every difference highlighted — no website needed, works offline, zero permissions.
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Compare any two texts and instantly see every difference — right from your browser toolbar. No website to visit, no account to create, no data sent anywhere. Text Diff Checker runs entirely offline in a clean popup window.
**Key Features:**
- **Side-by-Side and Inline Views** — Toggle between a two-pane layout and a unified inline diff to match your workflow
- **Character-Level and Line-Level Diff** — Switch between granular character highlighting and broader line-level comparison with one click
- **Copy Diff Output** — Export the full diff with +/- markers to your clipboard for pasting into pull requests, documents, or chat
- **Dark and Light Themes** — A developer-friendly dark theme by default, with a light theme toggle that remembers your preference
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