Knowledge Book

Save highlighted text from any web page into a searchable book of notes, with optional AI summaries and one-click Obsidian export.

Knowledge Book turns the useful bits of anything you read online into a personal, organized field journal. Highlight text on any web page — ChatGPT, Claude, Gemini, Perplexity, any site — and save it with one click. Formatting survives (tables, lists, code, images), notes file into colorful notebooks, and everything stays searchable on your device. FEATURES • Save highlighted text from any website or AI chat — floating button, right-click, or per-message save. • Structure preserved — tables, lists, headings, code, and images stay intact. • Notebooks with drag-and-drop: move notes between tabs, merge notes, group same-page saves. • Ask your book — AI answers drawn from your own notes, with citations (bring your own OpenRouter key). • Per-note AI: explain it simply, give me an example, quiz me. • Extract text from images and screenshots (great for scanned PDFs) — right-click or just Ctrl+V in your book. • Export anywhere: one-click Obsidian, plain-Markdown folder export, or a full JSON backup. • Beautiful field-journal design with light & dark mode. A welcome tour gets you started. PRIVACY Everything is stored locally on your device — no account, no tracking, no ads. Content goes to a third party only when you use an AI feature (to OpenRouter, with your own key) or send a note to Obsidian on your computer.