Du↔Sie Formalizer

Convert German text between informal (Du) and formal (Sie) register using Claude AI.

**Du↔Sie Formalizer** instantly converts German text between informal "Du" and formal "Sie" address using Claude AI (Anthropic). Whether you are writing a business email, a casual message, or academic correspondence, get the register right every time. ### How it works 1. Click the extension icon (or right-click any selected text on any page) 2. Choose Du→Sie or Sie→Du 3. The conversion streams in real time — no waiting for the full result ### Three conversion modes - **Standard** — Accurate pronoun and verb conversion while preserving original tone - **Polished** — In addition to Du/Sie conversion, improves sentence flow and removes colloquialisms - **Strict Corporate** — Maximum formality: eliminates contractions, applies the highest level of business register, and suggests formal salutations where needed ### Where you can use it - **Popup** — Quick 320px window for instant conversions - **Side Panel** — Full workspace with side-by-side diff view highlighting every changed word, plus conversion history (last 10 entries) - **Context Menu** — Right-click any selection on any page to convert without leaving the page; the floating card lets you replace, copy, or retry ### Features - Streaming output — see results as they arrive - Side-by-side LCS diff — every changed word is highlighted (red strikethrough for removed, green underline for added) - Conversion history — restore any of the last 10 conversions with one click - Tone intensity slider — Standard, Polished, or Strict Corporate - Dark mode — automatically adapts to your system theme - RTL support — interface works in Arabic, Hebrew, Farsi, and Urdu locales - Keyboard shortcut — Ctrl+Enter (Cmd+Enter on Mac) to convert - Fully localised in English and German ### Privacy - Your API key is stored locally in your browser and sent **only** to the Anthropic API - The text you convert is sent to Anthropic's API — nothing is stored or logged by the extension - No analytics, no tracking, no cookies, no third-party servers - Open source and fully transparent ### Requirements - A valid Anthropic API key (available at console.anthropic.com) - Chrome or any Chromium-based browser