PDFFree plan
NotebookLM
Research notebook for source-grounded summaries and document-based answers.
Official siteCategory
AI PDF Tools
AI PDF tools help users summarize, search, question, and organize document-heavy workflows.
Start here: NotebookLM for PDF research (2026 workflow) — retrieval-first reading with verified sources.
PDFFree plan
ChatPDF
Tool for asking questions about PDF files and extracting quick summaries.
Official site