ChatPDF

ChatPDF is an AI assistant that lets people ask questions of documents instead of reading them page by page. A user drops in a PDF, pastes a link or text, or points it at a video or website, and then chats with the content in plain language to get summaries, explanations and answers. The service is aimed at students, researchers and professionals who work with papers, textbooks, contracts, financial reports and manuals. Answers carry built in citations that point back to the passages in the source file, so claims can be checked quickly. Folders let a user group several files and chat with multiple PDFs in a single conversation, which helps when comparing studies or study materials. It accepts documents in any language and can respond in any language. Alongside the document chat, the site offers related tools including an AI writer, an AI detector, YouTube chat and a research tool, plus desktop and mobile apps. ChatPDF can be tried without signing up, and creating a free account saves chat history. A Plus upgrade is offered for heavier use, but the vendor does not publish plan prices on the pages that were readable, so no specific figures are quoted here. The product was built around a simple loop of upload, ask and verify against the cited source, and it has since broadened from PDFs to other file types, video links and web pages.