ChatPDF

ChatPDF is a chat tool for any PDF: upload a document, and it lets you ask questions, summarise sections, and extract answers in plain language. It is the best-known PDF chat tool, and it works with research papers, contracts, textbooks, and any other PDF you upload.

Key Features

Chat with any PDF in plain language
Summarise sections and extract answers
Works with papers, contracts, and textbooks
Cited answers linked to the document
Upload multiple PDFs on paid plans
Free plan for 2 PDFs a day

Pricing

Plan	Price	Details
Free	$0	2 PDFs a day, 20 questions a day, 120 pages per PDF.
Plus	$14.99/mo	Unlimited PDFs, larger files, more questions; $89.99/yr on annual billing.

Prices as listed in 2026 research. Always check the official site for the latest price — plans change. Free plan: Yes — it has a free plan.

Best for: anyone who wants to chat with a PDF and get quick answers from it.
Popular with: Students, Teachers, Writers

How it works

The free plan covers 2 PDFs a day and 20 questions, enough to test it properly. Plus costs $14.99 a month, or $89.99 a year, for unlimited PDFs, larger files, and more questions. It is a simple tool that does one job well: making a long PDF answer your questions.

ChatPDF is the easiest way to start with AI document chat. It will not replace a reference manager, and its answers need verifying, but for quickly understanding a paper or contract it is genuinely useful — and the free plan is generous enough for occasional use.

Pros and Cons

✓ Pros

Simplest PDF chat tool to start with
Free plan covers 2 PDFs a day
Works with any PDF, not just papers
Cited answers link back to the document

✗ Cons

Free plan is limited to 2 PDFs a day and 20 questions
Answers can be wrong — always verify against the document
No reference manager or citation formatting

Key Features

Pricing

How it works

Pros and Cons

✓ Pros

✗ Cons

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