How to Summarize a PDF on iPhone: 5 Ways (2026)

You can summarize a PDF on an iPhone in five ways: Apple Intelligence features built into iOS 27, a general AI assistant (ChatGPT, Claude or Gemini), the Gemini Notebook app (formerly NotebookLM), a PDF-specific tool such as ChatPDF or Adobe Acrobat’s AI Assistant, or a summarizer app such as SumAI. The right one depends on your iPhone model, the PDF’s length and what the summary is for.

SumAI is our app, so weigh our view accordingly. Facts about other products come from their makers’ help pages and App Store listings, checked in November 2026. Prices and limits change.

How do the options for summarizing a PDF compare?

Option	What you get	Documented limits
Apple Intelligence	Summary text only	Needs iOS 27 on iPhone 15 Pro, 15 Pro Max, iPhone 16 or later
ChatGPT	Summary and chat	Free plan: 3 file uploads a day
Claude	Summary and chat	PDFs up to 1,000 pages; charts read only up to 100 pages
Gemini	Summary and chat; quizzes and flashcards	10 files per prompt, 100 MB per document
Gemini Notebook	Chat with in-line citations	iPhone app cannot yet make mind maps, notes or reports
ChatPDF	Chat with citations that jump to the passage	Free plan: 2 documents a day
Acrobat AI Assistant	Summaries and cited answers in Acrobat Reader	PDFs under 100 MB, up to 600 pages
SumAI	Five summary styles, Ask AI, mind map, quiz, flashcards	PDF needs selectable text

How do you summarize a PDF with Apple Intelligence?

Apple Intelligence summarizes text on supported iPhones. Apple’s requirements page lists iOS 27 on an iPhone 15 Pro, iPhone 15 Pro Max, iPhone 16 or later, iPhone Air or iPhone Duo, with the device and Siri set to the same supported language. Apple’s iPhone User Guide describes three routes that work with a PDF, and each returns summary text only:

• Writing Tools. Writing Tools works on text you select: tap the Writing Tools button, then Summarize or Key Points. For a PDF, copy the passage in the Preview app, paste it into a note and select it there. This suits a few pages, not a whole report.
• Siri AI (beta). Apple says you can ask Siri about content on your screen, and names a PDF as an example. In the Siri app you can add a file to a conversation with the Add button, then Files. Siri AI is available in English, French, Japanese, Korean, Portuguese and Spanish to start, and not initially in the EU on iOS.
• Accessibility Reader. Accessibility Reader shows the text of any app in a reading view. Turn it on in Settings under Accessibility, then Read & Speak. With the PDF open, start it from Control Center or the share menu and tap Summarize at the top of the content.

Apple does not document a Summarize button inside the Files or Preview apps. Apple’s Preview pages cover opening, searching, annotating and scanning PDFs. That is not proof that none exists, only that Apple does not publish one.

How do you summarize a PDF with ChatGPT, Claude or Gemini?

ChatGPT, Claude and Gemini are general AI assistants with iPhone apps. Attach the PDF to a chat, ask for the summary in the shape you want, then ask follow-up questions. Their documented limits, as of November 2026:

• ChatGPT. OpenAI’s upload guide allows up to 512 MB per file and limits free users to 3 file uploads a day. It says ChatGPT can analyze both the text and the images in a PDF, including charts and diagrams. ChatGPT also has flashcards and a study mode.
• Claude. Anthropic’s upload guide allows PDFs of up to 1,000 pages. Claude reads text and visual elements in PDFs of 100 pages or fewer, and text only from 101 to 1,000 pages.
• Gemini. Google’s upload guide allows up to 10 files per prompt and up to 100 MB per document. Gemini can also create quizzes, flashcards and study guides from files you add.

A general assistant is the flexible choice, because your prompt sets the length and focus of the summary.

How does the Gemini Notebook iPhone app handle a PDF?

Gemini Notebook, which Google renamed from NotebookLM in July 2026, is organized around notebooks: you add sources, then chat with them. According to Google’s help page for the mobile app, the iPhone app accepts PDFs, and you can send one to an existing notebook from the iOS share sheet. The Chat panel shows a generated summary of your sources, and the app can make flashcards and quizzes. The App Store listing says answers cite your sources in-line.

Google says generating notes, mind maps, reports and data tables is not yet available in the mobile app. Each source is capped at 500,000 words or 200 MB, with no page limit.

Gemini Notebook can be used free with a Google Account, and it is the stronger choice when you work across many documents on one topic. See SumAI vs Gemini Notebook.

When is a PDF-specific tool the better choice?

PDF-specific tools are built around the document view, so their strength is showing where an answer came from.

• ChatPDF is a web tool with an official iPhone app from ChatPDF GmbH. ChatPDF’s site says answers carry clickable citations that scroll to the source passage, and that the free plan covers 2 documents a day. One caution: the App Store listing shows the iPhone app was last updated in May 2025. The pages we read do not state page or file-size limits for the free plan.
• Adobe Acrobat AI Assistant runs inside the Acrobat Reader app. Adobe’s requirements page limits it to PDFs under 100 MB and up to 600 pages with no password protection. The App Store listing calls AI Assistant a paid feature that is free for a limited time. We could not confirm one current price for the add-on, because Adobe’s own pages showed different figures by region.

How do you summarize a PDF with SumAI?

SumAI is an AI summarizer app for iPhone and iPad. It requires iOS 16.0 or later, so it also runs on iPhones that cannot use Apple Intelligence. You pick a PDF, choose one of five summary styles (TL;DR, Standard, Detailed, Study Guide or Chapters) and a language from more than 60, and SumAI writes the summary from the text of the document.

The summary comes with more than text:

• Ask AI answers questions from the text of the document. See how to chat with a PDF on iPhone.
• A mind map shows the main idea and its subtopics.
• A multiple-choice quiz and flashcards are generated from the summary.
• Listen reads the summary aloud.

SumAI’s PDF summarizer needs a PDF with selectable text, and information that exists only in a chart or image is not part of the text it reads. There is no Android app, web app or browser extension. SumAI is free to download, with an optional Premium subscription at $2.99 a week or $29.99 a year in the US as of November 2026.

What if the PDF is a scan?

A scanned PDF stores each page as a picture, so a tool that reads the document’s text finds nothing to read. That includes SumAI.

Apple publishes no official test for a scanned PDF. In practice, open the PDF and touch and hold a word to select it, or search for a word you can see on the page. If you cannot select or search any words, the PDF is a scan.

The reverse does not hold. Since iOS 16, Apple’s PDF framework can recognize text in a scanned page on demand with Live Text, as Apple told developers in 2022. A scan can therefore look selectable on an iPhone while the file still contains only images.

So a failed selection is a reliable sign of a scan. A successful one is a good sign, not proof of a text layer.

To summarize a scan, first run it through an OCR (optical character recognition) tool that saves a searchable PDF. ChatPDF’s summary page says it supports scanned PDFs. We could not confirm whether Gemini Notebook or Acrobat’s AI Assistant read image-only PDFs. For a page or two of paper, Scan Text in the Notes app inserts the recognized words into a note as real text.

Apple’s pages do not say that a PDF made with Scan Documents in Notes or Files contains a selectable text layer, so do not count on it.

Which method should you choose?

• You have a supported iPhone and want the gist: Accessibility Reader’s Summarize, or Siri AI.
• Charts and figures carry the meaning: ChatGPT, or Claude for PDFs of 100 pages or fewer.
• The PDF is very long: Claude (up to 1,000 pages) or Gemini Notebook (no page limit).
• You need to see the source of each claim: ChatPDF, Acrobat’s AI Assistant or Gemini Notebook.
• You are studying the material: SumAI’s Study Guide style with the quiz and flashcards. ChatGPT, Gemini and Gemini Notebook also make flashcards and quizzes.

Whichever tool you use, an AI summary can miss nuance or get a detail wrong. Check any number, name or quotation against the PDF before you rely on it. To try the SumAI route, download SumAI.