AI Chat PDF
Chat with any PDF: ask questions, get answers, and extract insights with intelligent in-browser search. Students quiz a textbook chapter in minutes — free to start.
Runs on PDF.js
How to Use the AI Chat PDF
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Frequently Asked Questions
How is AI Chat PDF different from Document Chat?
Chat PDF parses and searches your PDF locally in the browser for instant Q&A over one file — fastest for textbooks and manuals. Document Chat (RAG) indexes multiple formats into a vector store for deeper multi-document research at 1 credit per answer. Start here; escalate long research there.
Are my PDFs uploaded when chatting?
No — parsing and search run locally in your browser with PDF.js, so the document never leaves your device. There are no cloud calls and no credits involved — the tool has no AI-provider buttons.
What PDFs give the best answers?
Native-text PDFs under ~500 pages: course books, manuals, contracts. Scanned image-only PDFs answer poorly until OCRed — extract text first, then chat. Heavy tables and two-column layouts may quote out of order, so verify numbers against the page.
Can I use AI Chat PDF offline?
Parsing and search work fully offline once the page loads, since everything runs locally. Your chat history stays in the browser session and clears when you close the tab.
How is the keyword match percentage calculated?
Query words of 2 or fewer letters plus a stop-word list are dropped; each paragraph split on blank lines is kept only if longer than 20 characters, else sentences longer than 10 characters are used. Each chunk scores matched divided by keywords with confidence rounded to a percent; the meter colors 70 percent and up green, 40 and up amber, below red. Example: 3 of 4 keywords matched gives 75 percent green. Show Text previews only the first 500 characters.
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Last updated October 2026