ChatPDF vs DeepPDF

ChatPDF lets users summarize documents and ask questions about their contents using conversational AI. Answers include citations that point to references in a PDF, and users can organize files in folders or discuss multiple PDFs in one conversation. It accepts PDFs in any language and supports conversations in any language; listed file types also include Word, PowerPoint, Markdown and text. Sharing links can be created, with access permissions managed or revoked. ChatPDF says documents are encrypted during transfer and storage and can be deleted by the user. Queries are routed dynamically between GPT-4o and GPT-4o-mini. The service works in a browser on any device and is listed for Android, iOS, Linux, macOS and Windows. Its backend API accepts uploaded PDFs or public URLs and lets users query them to build custom PDF chatbots. The API documentation limits each PDF to 2,000 pages or 32 MB and describes the chat API as stateless. The Free plan costs nothing and allows two documents per day.

DeepPDF is a web PDF assistant, also offered as an extension, with free plans listed. Users can chat with PDFs, create summaries, compare translations, explain terms, and analyze images or formulas. OCR makes scanned, image-based PDFs searchable. Translation provides a side-by-side bilingual view in more than 100 languages. Conversion tools handle PDF to Word, Excel, PowerPoint, and other formats, plus Word to PDF. Utilities include compression, merging, splitting, page deletion, watermarks, signing, and online text editing. Google Scholar access supports academic-paper searches and recommendations. The browser upload area states a 200 MB maximum PDF size. The Free plan is free, billed forever, with 10 PDFs up to 5 MB each and limited AI and features. Pro is free during beta for 200 PDFs up to 50 MB, while Max is free during beta for 1,000 PDFs up to 200 MB; both list unlimited AI and features. Email support and a Discord community are available.