Question: I need a search engine that can handle multiple file formats, including PDF, Word, and Excel - do you know of any?

FileGPT is an AI-powered information retrieval system that can index PDFs, DOCs, audio, video and web pages. It has cross-source queries so you can select sources and ask questions, and it comes in several pricing levels depending on your needs. It's useful for people who have to wrestle with different content formats and who want to automate their workflow and get more done.

Another good option is Three Sigma, an AI-powered research tool that can quickly find answers in documents in multiple formats like PDF, Word, PowerPoint and Excel. It shows its work by revealing the steps it takes to come up with an answer, and it integrates with existing ChatGPT accounts. It has a tiered pricing system starting with a free level, so it's good for professionals who need to dig through lots of documents.

ChatDox is another powerful option, an AI-powered system that can extract information from a wide range of documents and multimedia files. It can index PDF, DOCX, TXT, CSV, YouTube videos and more, and it has options for custom categories, multiple languages and live support through a Discord server. It's good for students, researchers and others who have to deal with a variety of content.

For a broader utility, ChatDOC offers immediate answers to questions and more detailed AI analysis of a variety of document types, including PDF, DOC, EPUB and more. It can analyze images, have multi-document conversations and analyze math formulas, for example. It's good for students, professionals and businesses. A browser extension lets you upload PDFs easily, and it encrypts data to protect privacy.