ChatPDF is an AI-powered web application that lets users upload documents (PDF, Word, PowerPoint, Markdown, TXT) and interact with them via a chat-style interface. Core capabilities include extracting summaries, answering questions with direct citations linked to original pages, comparing and searching across multiple documents, translating content and allowing multilingual questions, and organizing files into folders for multi-document conversations. The platform offers a free tier (core features, up to 2 PDF uploads per day without registration) and a paid "ChatPDF Plus" plan described as providing unlimited document analysis and advanced features (saving chats, multi-document conversations). The site references additional platform tools such as AI Writer (academic drafting with citations), AI Detector, AI Scholar, Chat with YouTube, and a backend API with developer docs. Security and privacy statements on the site indicate SSL encryption in transit, encrypted storage using SOC 2 Type II compliant providers (per site wording), user-controlled deletion of files and chats, and secure share links with access control. Items not confirmed on the inspected pages include exact Plus pricing, precise file-size and page limits per plan, any trial/refund/team/enterprise offerings, and full security architecture and retention policy details. Suggested next steps include checking the signup/pricing flow for exact plan pricing and terms, extracting file-size/page limits and detailed privacy wording from FAQ/privacy pages, and fetching/summarizing the backend API docs.