Stay free if you only need chat with pdfs without an account and up to 2 pdfs per day (120 pages max, 10 mb limit). Upgrade if you need unlimited pdfs, pages, and file sizes and unlimited daily questions. Most solo builders can start free.
Why it matters: Restrictive free tier with only 2 PDFs per day and 50 questions — power users hit limits quickly
Available from: Plus
Why it matters: 120-page per-document limit excludes many business contracts, research papers, and technical manuals
Available from: Plus
Why it matters: No multi-document analysis or cross-document comparison capabilities
Available from: Plus
Why it matters: Text-only responses without visual citations showing where in the PDF answers originate
Available from: Plus
Why it matters: Cannot process scanned PDFs — no OCR functionality for image-based documents
Available from: Plus
Yes, ChatPDF offers a free tier that requires no signup or account creation. You can upload up to 2 PDFs per day (max 120 pages each, 10 MB size limit) and ask up to 50 questions daily. For unlimited access, the Plus plan costs $5/month.
Google NotebookLM is free with no upload limits, supports up to 50 sources per notebook, provides inline citations, and enables multi-document synthesis. ChatPDF's advantage is zero-signup access and a simpler interface, but NotebookLM offers significantly more capability at no cost. The main reason to choose ChatPDF over NotebookLM is speed and simplicity for single-document queries where you do not need cross-source analysis.
No. ChatPDF requires machine-readable text within the PDF. Scanned documents that are essentially images of text will not work unless they have been processed with OCR (optical character recognition) software first. Tools like Adobe Acrobat or online OCR services can convert scanned PDFs to searchable text before uploading to ChatPDF.
The free tier supports PDFs up to 120 pages and 10 MB in file size. The Plus plan ($5/month) removes these restrictions, supporting larger files and longer documents. However, users report that accuracy tends to decline on very long documents (100+ pages), regardless of tier.
ChatPDF processes documents on cloud servers, so uploaded content is transmitted over the internet. As a German company, ChatPDF GmbH operates under GDPR regulations. However, for highly sensitive legal, medical, or financial documents, consider whether cloud-based processing meets your organization's security and compliance requirements before uploading. ChatPDF does not publish detailed SOC 2 or ISO 27001 certifications.
No. ChatPDF only supports single-document conversations. You cannot upload multiple PDFs for cross-document analysis or comparison. For multi-document research, Google NotebookLM (free, up to 50 sources) or Claude (paid, multi-file uploads) are better alternatives.
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Last verified March 2026