Librarian is a browser extension powered by lightweight Retrieval-Augmented Generation (RAG) and AI technologies. It enables users to manage and query their personal knowledge bases, swiftly retrieving the most relevant information through semantic search and keyword analysis. Key benefits include hassle-free setup, robust data security, and support for offline use. It's ideal for users who need to efficiently manage and query extensive documents, benefiting students, researchers, and professionals alike. Currently offered free of charge, Librarian aims to empower users to better organize and analyze knowledge.