QuickDef – AI Dictionary for PDFs & English Learners

AI dictionary for English learners that works on PDFs and web pages. Double-click words for simple meanings.

QuickDef is an AI-powered dictionary built for English learners who read PDFs and web pages. Most dictionary extensions fail inside PDFs. QuickDef works where others don’t. Just double-click any word in a PDF or on a web page to see a clear, learner-friendly meaning instantly. No tab switching. No complex dictionary language. No broken reading flow. QuickDef focuses on understanding, not memorizing definitions. Key features: • Works inside PDFs and regular web pages • AI-generated simple definitions for English learners • Context-aware meaning selection • Double-click any word for instant explanation • Clean, distraction-free popup (Kindle-style) • Optional full dictionary definition • Save words and review them later QuickDef is designed for non-native English speakers who want to read with confidence, especially academic papers, articles, and long PDFs. AI usage: QuickDef uses AI to generate simplified, learner-friendly explanations. Only the selected word and limited surrounding context are processed. Free to start. No setup required.