If you need a tool to quickly summarize and analyze lots of PDF files, ChatPDF is a good option. It uses AI to summarize and ask questions of PDFs, letting you upload groups of hundreds of files and pose natural language questions. The service works with multiple languages and protects data, so it's good for students, researchers and professionals.
Last, Coral AI is a general-purpose tool that can extract information from PDFs in more than 90 languages. It can summarize documents, answer questions, translate documents and even generate citations. It's designed to help you work faster and be more productive, so it's good for academic and professional use.