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ChatPDF is an AI document-reading, research, study, and drafting platform operated by ChatPDF GmbH. Its core experience lets users upload a document, receive a summary, ask follow-up questions, and open page-linked citations beside the original source. It now supports more than PDFs in the consumer app, including Word, PowerPoint, OpenDocument, Markdown, plain text, RTF, HTML, JPEG, and PNG inputs through the live upload interface. Users can create folders for multi-file conversations, compare sources, translate across languages, save chat history after signing in, share a source through a revocable link, and use the service through web, desktop, iOS, or Android routes. The wider product suite adds YouTube chat with timestamp references, AI Research for finding and summarising academic papers, AI Writer for source-linked drafting, AI Flashcards with spaced repetition and study-platform exports, AI Slides with PowerPoint export, and an AI Detector. ChatPDF says the main document chat dynamically routes questions between GPT-4o and GPT-4o-mini. The product is easy to try without an account. The public homepage says the free plan can analyse two documents per day, while signing up adds saved history and multi-document folders. The live application configuration further exposes free limits of 20 chat messages per day, two active chats per day, 120 pages and 10 MB per file, five files per folder, two flashcard decks per week, one AI detection per day, two Writer generations per day, and one slide download per week. Some free counters are feature-specific and can change independently, so the in-product meter is the final authority. ChatPDF Plus is currently offered to a US web visitor at $14.99 per month or $90.99 per year. The US App Store lists $14.99 monthly and $89.99 yearly. Currency, tax, regional pricing, experiments, discounts, and app-store billing can change the checkout amount. Plus is marketed as providing unlimited document analysis, questions, videos, flashcards, and presentations, but the live client still defines fair-use-style ceilings. Current Plus configuration includes 2,000 pages and 150 MB per file, 50 files per folder, 50 files per upload, 2,000 chat messages across up to 1,000 chats per day, 200 flashcard decks per week, 500 AI detections per day, 100 Writer generations per day, and 100 presentation downloads per week. Buyers should understand unlimited as high plan-level access rather than an absence of every technical or abuse-control limit. ChatPDF also offers a backend API for programmatic PDF upload, URL ingestion, question answering, page references, streaming, and source deletion. The API is not the same as the consumer Plus plan. Official API documentation limits each source to 2,000 pages or 32 MB, accepts PDF files, treats each chat request as stateless, allows up to six supplied messages, and ignores older context when the submitted history exceeds 2,500 OpenAI tokens. API or organisational billing is handled separately and does not have complete public self-serve pricing documentation. ChatPDF is strongest for quickly locating, summarising, translating, explaining, comparing, and studying information in readable documents. It is not a substitute for reading decisive source passages, evaluating research methods, checking calculations, confirming legal or clinical meaning, or protecting information under an organisation's formal data-governance rules. Page citations improve traceability but do not prove that an answer is complete, correctly interpreted, or free from hallucination. OCR, complex tables, diagrams, equations, footnotes, unusual layouts, and weak scans should be tested with representative files. Privacy documentation also needs caution. The homepage says files are protected with SSL in transit, encrypted while stored, and held by a SOC 2 Type II certified storage provider, with user-controlled deletion. However, the Privacy Policy, Terms, and Imprint links currently published in ChatPDF's own footer return missing-page errors. The iOS disclosure says identifiers may be used for tracking, some identifiers may be linked to the user, and user content, coarse location, usage, and diagnostics may be collected without being linked. Organisations should obtain current legal terms, retention periods, subprocessors, model-training rules, data residency, deletion behaviour, and contractual safeguards directly from ChatPDF before uploading confidential, personal, student, medical, legal, financial, unpublished, or regulated material. ChatPDF is best for students, researchers, educators, analysts, and professionals who want a low-friction conversational layer over documents and videos. It is less suitable for local-only processing, guaranteed extraction, comprehensive systematic reviews, unsupervised high-stakes decisions, advanced PDF editing, or teams that require current public compliance and procurement documents before evaluation.

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