ChatPDF is an AI tool that enables users to interact with PDF documents in a conversational format. It creates a semantic index for every paragraph in the PDF file before answering the user's questions. This tool is useful for quickly extracting information from large PDF files, saving time writing notes or summaries. It can comprehend financial and sales reports, project and business proposals, training manuals, legal contracts, textbooks, handouts, and presentations. ChatPDF utilizes a text-generation AI model comparable to ChatGPT to understand the content of the PDF file and provide relevant responses. However, it may not be able to understand images within the PDFs, and it might struggle with questions that require understanding more than a few paragraphs simultaneously. The user's data is securely stored in the cloud and deleted after 7 days, ensuring data privacy. ChatPDF contributes to the AI revolution by making documents intelligent and enabling users to interact with them in unprecedented ways.