If you want a service where you can upload files and ask unlimited questions and get short answers, Humata is a good option. This AI-powered information retrieval service lets you upload unlimited files with no file size limits, ask unlimited questions, and get answers with highlighted citations that link to the original source files. It has strong security options like private clouds, 256-bit SHA encryption and role-based access control. Humata also offers a range of pricing options, including a free tier and a student tier, so you can find a plan that fits your needs.
Another option is ChatPDF, which is geared for people who want to understand PDFs better by extracting information and answering questions. It lets you have multi-file chats so you can organize files into folders and have a conversation with a group of PDFs. It's good for students, researchers, professionals and anyone else who wants to get answers out of documents. It also cites sources, adding references to the original documents in its answers, so you can check the information.
PDF GPT offers similar abilities with summarization, question answering, translation, citation and search. You can upload PDFs and get answers, summaries and citations in a few seconds. It supports more than 90 languages, and a Pro version costing $6 per month offers unlimited file uploads and chats. It can be a huge time saver, with many users reporting they save 10-15 hours a week.
If you want to analyze a larger document, ChatDOC will give you answers to questions, multi-document chat and a detailed AI analysis of text, tables and images. It can handle a variety of file formats, including PDF, DOC and EPUB, and lets you create custom models to fine-tune answers. Its Pro plan has no file size or page limits per file, so it's good for students, professionals and businesses.