ChatPDF vs pdfAssistant.ai

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.

pdfAssistant.ai is a web-based, no-code PDF platform that turns natural-language requests into reusable workflows for batch processing. It provides more than 40 operations, including compression, merging, extraction, redaction, conversion, and watermarking. Saved workflows can run on uploaded folders containing hundreds or thousands of documents. AI Studio handles one-off analysis, summaries, key-term extraction, and PDF creation from descriptions. The service supports multiple PDFs per chat and scanned PDFs, with exports including PDF, DOCX, XLSX, PPTX, Markdown, PDF/A, PDF/X, PNG, JPEG, TIFF, GIF, BMP, FDF, XFDF, XML, XDP, and XFD. MCP integrations are listed for ChatGPT, Claude, and Codex, but require a paid plan. Adobe Express add-ons export PDF/X, PDF/A, or custom images. Starter is free with preview mode; full downloads require payment. The maker says transfers use TLS 1.3, stored files use AES-256, and files are deleted within 24 hours.