# How to chat with a PDF on iPhone Duo, source in view > Chat with a PDF on iPhone Duo with Nimbo: the conversation beside the document, every answer cites its page, and nothing is lost when you fold. Written by the Nimbo team · Published October 28, 2026 Short answer To chat with a PDF on iPhone Duo, unfold the phone, open the document in Nimbo, tap the AI button, then Ask about this PDF, and type your question. Unfolded, the conversation sits beside the PDF: tap a cited source and the document moves to that page, without closing the chat. Ask is part of Nimbo Pro. ## Why two panes change how you ask a PDF An answer is only worth something if you can check it. In Nimbo, every answer quotes the passages it relies on, with their page numbers. On a regular iPhone, checking a citation means leaving the conversation for the document, then coming back. On the inner screen of iPhone Duo, both stay in view: the question on one side, the PDF on the other. Tap a cited passage and the page scrolls into view. You read the exact wording without losing the thread of the conversation. ## Step by step 1. Unfold the phone and open the PDF in Nimbo: a contract, a report, course notes or a scanned letter. 2. Tap the AI button, then Ask about this PDF. The conversation opens beside the document. 3. Type a concrete question, for example: What is the notice period? 4. Read the answer, then the quoted passages under it, each with its page number. 5. Tap a citation: the PDF moves to that page, and the conversation stays open. 6. Ask a follow-up: the conversation keeps the context of the previous questions. Want to read a whole page? The full screen button gives the entire inner screen to the PDF. The same button brings the conversation back. ## Fold without losing the conversation You can fold the phone in the middle of a conversation. Nimbo keeps the Ask conversation, the page you are on and the zoom when you fold or unfold. Folded, Nimbo works like on any iPhone, in one column; unfold again and the conversation is back beside the PDF. ## What to ask a PDF - Facts: What is the deposit amount? When does the contract end? - Lists: Which documents must I provide? What are the exclusions? - Study: Explain the second theorem with the example from the notes. Keep questions concrete and about the document. Ask does not browse the web: it reads the PDF you opened. The [chat with a PDF on iPhone](https://nimbopdf.com/how-to-ask-questions-to-a-pdf-on-iphone/) article has more examples, valid on any iPhone. ## Ask and read on the same screen The unfolded Reader helps between questions too. The page thumbnails sit beside the document, and in landscape two pages show side by side. The [reading PDFs on iPhone Duo](https://nimbopdf.com/blog/reading-pdfs-on-iphone-duo/) article covers every layout, and the [translating on iPhone Duo](https://nimbopdf.com/blog/translate-a-pdf-on-iphone-duo/) article shows the other two-pane AI feature. ## What leaves the phone, and what does not Ask is one of Nimbo's four AI features, the only ones that use a server. Before the first request, the app asks for your permission; you can withdraw it at any time in Settings. The server runs in the European Union and keeps neither your question nor your document. Scanning, signing and compressing never send anything. The [ask guide](https://nimbopdf.com/how-to-ask-questions-to-a-pdf-on-iphone/) and the [how it works](https://nimbopdf.com/how-it-works/) page have the details. ## Frequently asked questions ### Is Ask free on iPhone Duo? No. Ask is part of Nimbo Pro, on iPhone Duo as on any iPhone. The monthly plan starts with a 3-day free trial for new subscribers. Scanning, importing and the Library stay free. ### What happens if I fold the phone during a conversation? The conversation is kept, like the page and the zoom. You find it on the outer screen, then beside the PDF when you unfold. ### Can I ask questions to a scanned document? Yes. Scan the letter or the contract with Nimbo, then ask the resulting PDF. A straight, well-lit capture gives the best results. ## Related tools [PDF reader](https://nimbopdf.com/pdf-reader/)[PDF to Text](https://nimbopdf.com/pdf-to-text/) ## More guides - [How to ask questions to a PDF on iPhone (with the exact source)](https://nimbopdf.com/how-to-ask-questions-to-a-pdf-on-iphone/) - [How to summarize a long PDF on iPhone](https://nimbopdf.com/how-to-summarize-a-pdf-on-iphone/) ## More from the blog - [How to read PDFs on iPhone Duo: fold, unfold, two panes](https://nimbopdf.com/blog/reading-pdfs-on-iphone-duo/) - [How to sign a PDF on iPhone Duo, folded or unfolded](https://nimbopdf.com/blog/sign-a-pdf-on-iphone-duo/) - [How to scan documents on iPhone Duo, folded or unfolded](https://nimbopdf.com/blog/scan-a-document-on-iphone-duo/) Do it now, free [PDF reader](https://nimbopdf.com/pdf-reader/) Runs in your browser. Nothing is uploaded. --- Source: https://nimbopdf.com/blog/chat-with-a-pdf-on-iphone-duo/ · Nimbo (English) · https://nimbopdf.com/llms.txt