PDF GPT is an AI-powered tool that can summarize, answer questions, translate, generate citations, search and generate study questions for PDFs. It works with more than 90 languages and a variety of documents. With a free version and a Pro version costing $6 a month, it's designed to help you free up time with a big productivity boost.
Another option is ChatPDF, which uses GPT-4 technology to quickly summarize and ask questions of PDFs. It can handle batch uploads and natural language queries, making it good for students, researchers and other professionals. The service offers several pricing tiers, including a 30-day money-back guarantee and strong data security protections.