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Open a PDF. Ask anything. A full PDF reader with an AI that searches your document in real time — no file upload, free trial. Open a PDF. Ask anything. QPaper gives you a complete PDF reader and an AI that uses your document as a knowledge base — retrieving relevant content in real time to answer your questions. No file uploads. A free trial is available. Your PDFs stay in your browser. Whether you're working through research papers, legal documents, study materials, or technical reports — QPaper keeps up. ── THE READER ── 📄 A full PDF viewer, nothing stripped out Zoom, table of contents, full-text search, and presentation mode. Everything you expect, exactly where you expect it. 🖊️ Annotation tools that go beyond the default viewer Highlight, draw, leave sticky notes — choose colors, adjust brush size, and pin notes to specific pages. Everything is baked into standard PDF format, visible in any PDF viewer. ── THE COMPANION ── 🤖 An AI that was there from page one The AI knows your current page and uses your whole document as a knowledge base to answer in real time. You don't need to explain what the document is — it's already there. 🔗 Click any page citation to preview it When the AI references a specific page, click the citation to open a floating preview — without losing your place. 📝 Markdown notebook A cross-document, auto-saving note space. Save any AI response with one click — and when you ask follow-up questions, relevant notes are automatically included. 📚 Ask across a whole folder of PDFs Group multiple documents together. Your companion reads across all of them, draws connections between papers, and answers questions that span sources — ideal for literature reviews, research, and multi-source studying. ── PLANS ── Try it free. Free — basic monthly quota, Fast models Basic — Standard quota, Fast + Balanced models Pro — Larger quota, all model tiers Unlimited — No usage cap, all models including Advanced Full details and pricing at qpaperapp.com/pricing. QPaper does not collect your browsing history. Page content is only sent to AI providers when you explicitly send a message.