Text Diff Checker

Paste two texts, instantly see every difference highlighted — no website needed, works offline, zero permissions.

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 - **Keyboard Shortcuts** — Swap panes, clear inputs, and copy diffs without leaving the keyboard (Cmd/Ctrl+Shift+S/X/C) **How It Works:** Click the extension icon in your toolbar. Paste your original text on the left and your modified text on the right. Differences appear instantly in the output pane below — additions highlighted in green, deletions in red, with unchanged context lines in gray. No "Compare" button needed; the diff updates live as you type or paste. **Completely Free. No Catches.** Every feature is included at no cost. There are no premium tiers, no usage limits, no ads, and no tracking. Text Diff Checker is a complete, standalone tool. **Your Privacy Matters:** No data collection. No tracking. No network requests. Your text never leaves your browser. The only data stored is your theme and view mode preference, saved locally on your device. **Built for Developers, Writers, and QA Testers:** Whether you are comparing code snippets, checking draft revisions, verifying config file changes, or diffing command outputs, Text Diff Checker gives you a fast, distraction-free text comparison tool that is always one click away. Install now and compare text faster than any website alternative.