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Knowledge Tooltip is a Chrome extension that transforms how you learn and explore information online. Simply highlight any text on any webpage, and get instant access to comprehensive knowledge from trusted sources like Wikipedia, Wiktionary, Wikidata, and AI-powered explanations.

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What makes Knowledge Tooltip different

Knowledge Tooltip brings information to you where you need it, eliminating the need to leave your current page or open new tabs. The extension provides five specialized knowledge tabs, each designed for a specific type of information:

Summary

Wikipedia article summaries with thumbnails and direct links to learn more

Define

Dictionary definitions with phonetics, audio pronunciation, and etymology

Facts

Structured quick facts from Wikidata like dates, population, nationality, and more

AI

Ask follow-up questions or get simple explanations using OpenAI (requires API key)

Translate

Translate between English and Arabic using AI (beta, requires API key)

Bilingual Support

Full English and Arabic interface with automatic language detection

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How it works

The extension uses a clean, privacy-first architecture:
  1. Content script (content.js) runs on every page, handling text selection and building the tooltip UI
  2. Background service worker (background.js) makes all external API calls to avoid CORS issues
  3. Popup interface (popup.html, popup.js) manages your settings and preferences
Your data stays private. No analytics, no tracking, no data collection. Selected text is sent directly to the relevant API (Wikipedia, OpenAI, etc.) and nowhere else.

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Knowledge sources

Knowledge Tooltip integrates with multiple trusted APIs:
TabData SourceAPI Key Required
SummaryWikipedia REST API, Wikipedia Search APINo
DefineWiktionary REST API, Free Dictionary APINo
FactsWikidata Search API, Wikidata Entity APINo
AIOpenAI Chat Completions (gpt-5-nano)Yes
TranslateOpenAI Chat CompletionsYes
The Summary, Define, and Facts tabs work immediately after installation. AI and Translate features require you to add your own OpenAI API key in the extension settings.

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Quick start

Installation

Load the extension in Chrome or any Chromium browser

Quickstart Guide

Get from installation to your first tooltip in under 2 minutes

Configuration

Configure language preferences and OpenAI API key

Features

Explore all five knowledge tabs in detail

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Browser compatibility

Knowledge Tooltip works on all Chromium-based browsers:
  • Chrome
  • Edge
  • Brave
  • Opera
  • Vivaldi
The extension uses Manifest V3, the latest Chrome extension standard, ensuring compatibility with current and future browser versions.

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