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QuickDef, an AI-powered dictionary extension, launches to help English learners understand words in PDFs and web pages by double-clicking
Hacker News · April 28, 2026
AI Summary
- •QuickDef is an AI dictionary designed for English learners that works inside PDFs and on web pages—addressing a gap where most dictionary extensions fail in PDFs.
- •Users double-click any word to see AI-generated, learner-friendly definitions with context-aware meaning selection, presented in a clean popup without interrupting reading flow. The extension also allows saving words for later review.
- •QuickDef processes only the selected word and limited surrounding context when generating explanations, and is free to start with no setup required. Version 1.1.2 was updated April 22, 2026.
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