Last updated 06-30-2026
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ChatPDF
ChatPDF lets you upload a PDF and ask questions about it in plain language, the way you would with a chat assistant. It maps document content so answers point back to specific pages, which makes it useful when you are working through research papers, contracts, manuals, or long reports.
The product goes beyond a single PDF chat. You can summarize files, compare documents in one conversation, translate content, and work with Word, PowerPoint, Markdown, and text files in addition to PDFs. Built-in citations jump to the source passage, and a side-by-side layout keeps the chat next to the document.
ChatPDF also bundles research, writing, and detection tools on the same platform. AI Research helps you find academic papers, AI Detector checks whether text looks machine-written, and additional tools cover YouTube chats, flashcards, and slides. The service is used widely by students and researchers, with the site citing more than 10 million users.
Ask questions about any uploaded PDF and get answers linked to the exact source page
Summarize full documents or chapters in seconds, including scanned PDFs
Chat across multiple files at once by organizing them into folders
Works with PDF, Word, PowerPoint, Markdown, and plain text uploads
Built-in AI Research finds academic papers and lets you chat with open-access PDFs
Side-by-side view keeps your document open next to the chat for quick verification
Routes queries between GPT-4o and GPT-4o-mini for a balance of speed and quality
Answers include clickable citations that jump to the referenced page in the PDF.
Supports PDF, Word, PowerPoint, Markdown, and text files, including scanned PDFs.
No account is required to start chatting with documents on the free tier.
Multi-file folders let you compare and query several documents in one chat.
Includes AI Research, AI Detector, and API access alongside core PDF chat.
The free plan is limited to 2 documents per day.
Public pricing details for ChatPDF Plus are not listed on the website.
Full paper chat in AI Research is limited to open-access research PDFs.
Is ChatPDF free to use?
Yes. ChatPDF offers a free plan that lets you analyze 2 documents per day without creating an account. A paid ChatPDF Plus plan adds unlimited document analysis and more advanced features.
What file formats does ChatPDF support?
ChatPDF supports PDF, Word (.doc and .docx), PowerPoint (.ppt and .pptx), Markdown (.md), and text files (.txt). It also handles scanned PDFs and lets you paste text or links to start a chat.
Do I need an account to use ChatPDF?
No. You can try ChatPDF without signing up. Creating a free account unlocks extras like saved chat history, multi-document chats, and access across devices.
Does ChatPDF use GPT-4 or other AI models?
ChatPDF routes queries between GPT-4o and GPT-4o-mini, choosing the model that fits the balance of speed, quality, and efficiency for each request.
Can I chat with multiple PDFs at the same time?
Yes. Create a folder, add your files, and ChatPDF can answer questions that draw on multiple documents in one conversation. You can compare content and look for connections across sources.
Is my data secure on ChatPDF?
ChatPDF encrypts files with SSL during transfer and keeps stored documents encrypted. Its storage provider is SOC2 Type II certified, and you can delete your documents at any time.
Does ChatPDF have a mobile or desktop app?
Yes. ChatPDF runs in any web browser and also offers a desktop app and a mobile app. The core chat and summary tools work across desktop, tablet, and phone.