Stay free if you only need basic features. Upgrade if you need advanced features. Most solo builders can start free.
Yes. ChatPDF offers a free tier that allows up to 120 pages per PDF, 10MB file size, and 50 questions per day with full Q&A capability and no account required. For heavier use, ChatPDF Plus is available at $19.99/month or $119.99/year with expanded limits and premium model access.
No. You can upload a document and start chatting immediately without any registration. Creating a free account unlocks additional features like saved chat history, multi-document folders, and the prompt library, but it is not required to use the core document Q&A functionality.
ChatPDF supports PDF (.pdf), Word (.doc, .docx), PowerPoint (.ppt, .pptx), Markdown (.md), and text files (.txt).
ChatPDF uses SSL encryption for data transfer and stores documents on SOC2 Type II certified infrastructure with encryption at rest. Documents are private by default, sharing is opt-in via secure links, and users can delete their documents at any time. ChatPDF does not train on user-uploaded documents without consent.
ChatPDF uses dynamic routing between GPT-4o and GPT-4o-mini, automatically selecting the best model for each query to balance quality and speed. Free-tier users primarily access GPT-4o-mini, while Plus subscribers get full GPT-4o access for complex analytical questions.
Yes. Create a folder, add your documents, and ChatPDF will understand relationships across all files. You can ask questions that span multiple documents, enabling comparative analysis, cross-referencing, and synthesis across up to 50 PDFs in a single folder.
Yes. ChatPDF supports documents in any language and allows cross-language interaction — upload a document in one language and ask questions in another. The AI handles translation and contextual interpretation seamlessly, making it suitable for multilingual research and international document workflows.
Yes. ChatPDF offers a REST API that allows developers to programmatically upload documents, submit questions, and retrieve AI-generated answers. Authentication uses API keys, and the API supports document management operations including upload via URL or file, question submission, and document deletion.
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Last verified March 2026