Last updated 08-31-2026
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ChatPDF
Upload a PDF and ask questions in plain language; ChatPDF maps every answer back to the page where it found the evidence. You can also paste YouTube links, website URLs, or plain text to start a chat without uploading a file. Supported uploads include PDF, Word, PowerPoint, Markdown, and plain text.
Unlike standalone PDF chat apps, ChatPDF bundles document chat with AI Research, AI Writer, AI Detector, YouTube chat, flashcards, and slides under one account. The side-by-side layout keeps your source open next to the chat, and citations jump straight to the referenced passage. General chatbots can summarize pasted text, but they do not map answers back to page numbers across multiple files in a folder.
Students use it to study for exams, summarize lecture notes, and work through homework faster. Researchers run literature reviews, chat with open-access papers in AI Research, and draft cite-ready text in AI Writer. Professionals turn to it for contracts, manuals, financial reports, and training materials.
The site cites more than 10 million users and over one million questions answered daily. ChatPDF routes queries between GPT-4o and GPT-4o-mini, and the free tier covers two documents per day with no account required.
Free tier analyzes up to 2 documents per day with no account required
Supports PDF, Word (.doc/.docx), PowerPoint (.ppt/.pptx), Markdown, and .txt uploads
Answers include clickable citations that jump to the exact page in your document
Multi-file folders let you query and compare several documents in one conversation
Routes queries between GPT-4o and GPT-4o-mini for speed and answer quality
AI Research searches academic papers and chats with open-access PDFs
YouTube chat returns answers with timestamp links to relevant video moments
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.
Bundles PDF chat with AI Research, AI Writer, AI Detector, and YouTube chat in one platform.
Side-by-side layout keeps the document open next to the chat for quick verification.
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.
YouTube chat on the free plan has daily video and message limits.
Is ChatPDF free to use?
Yes. ChatPDF includes a free tier with 2 documents per day. You can start chatting immediately, and signing up unlocks saved history and multi-document folders. ChatPDF Plus adds unlimited document analysis for power users.
What file formats does ChatPDF support?
ChatPDF supports PDF (.pdf), Word (.doc and .docx), PowerPoint (.ppt and .pptx), Markdown (.md), and text files (.txt). You can also paste text, website links, or YouTube URLs to start a chat without uploading a file.
Do I need an account to use ChatPDF?
No. ChatPDF lets you try core features without signing up. Creating a free account unlocks saved chat history, multi-document folders, 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.
Can ChatPDF chat with YouTube videos?
Yes. ChatPDF's YouTube chat accepts a video URL, analyzes the transcript, and returns answers with clickable timestamps. The free plan includes daily limits, and ChatPDF Plus unlocks unlimited videos and messages.