LookStuffUp — Instant definitions, translations & AI summaries

Instant definitions, translations & AI summaries for any selected text. Private, on-device AI.

LookStuffUp — Instant answers without breaking your flow. Tired of popping open a new tab for every little thing? Same. LookStuffUp puts knowledge right where you need it: on the page. Why it exists: I built this because I wanted it. It’s 100% free. No ads✅, no in-app purchases/sign-ups✅, no paywalls✅. All the features you see are yours to use, right out of the box. Key Features 🚀 -💡Instant Context, Anywhere: Highlight text to see concise info with source links if you want to go deeper. -🧠Intelligent & Multi-Source Search: I've designed the search to be smart. It pulls the best information from multiple sources like Wikipedia, Wiktionary, and the dictionary to give you a well-rounded definition or summary. (Optional Google boost: Add your own free Google API key for higher‑quality web lookups without leaving the page.) -🤖On-Device AI for Summaries & Translation: Go beyond simple lookups. With Chrome's experimental AI features enabled, you can instantly summarize long articles or translate text between 20 languages. Because this all happens on your device, it's completely private and even works offline! 🎨Make it yours: - Drag it anywhere on the screen. - Toggle Dark Mode. - Adjust the font size. - Set a custom background color (the text color adjusts automatically for readability!). - Per‑site control: One‑click “Disable on this site” and a blacklist to keep it off where you don’t want it on.. - 🌎Multi-Language Ready: The extension automatically detects the language of the text you highlight and provides results from the appropriate sources. -⚡Performance-Optimized: A smart cache provides near-instant results for recent searches, and the extension is designed to be lightweight, saving you RAM compared to opening a new tab for every query. Your Privacy Comes First 🔒 -No tracking. No ads. No analytics. - Your API key (if added) stays in your browser’s local secured storage. - Lookup history stays on your device. - You can disable lookups or blacklist sites anytime. - Summarization and translation run locally on supported Chrome versions. I don't collect any of your data. Your business is your own ;) Notes Works on desktop Chrome (not mobile browsers). Free. No paywalls. No upsells. Changelog v1.7.0 Added settings icon in tooltip header and clicking the extension icon opens settings instantly Smart Enable/Disable Toggle Some other QOL improvements v1.6.1 Code and reliability improvements v1.6 Always show “Search on Google →” in the Lookup tab. Added “Disable LookStuffUp on this website” button for instant blacklisting Added AI flags setup guide for Chrome users Improved error handling Minor code improvements for increased robustness v1.5.1 Small tweaks v1.5 Added on-device AI functionality - Summarization and Translation. Added History functionality. Performance improvements and bug fixes. v1.4 Added draggable window functionality and some other performance enhancements v1.3 Fixed minor bugs v1.2 Performance enhancements and caching improvements