PDFGPT.IO is an AI tool that allows users to interact with PDF documents through a chat interface. It offers a unique way to navigate and extract information from PDFs, making it quick and easy to find answers. The tool also offers a subscription-based pricing model, with different plans that provide varying limits on the number of PDF pages that can be consumed each month. The tool allows users to upload PDFs of any size, without a limit on the number of pages per PDF. PDFGPT.IO has potential applications in various fields that require working with PDF documents, such as research, education, and business.