The best AI PDF readers
Updated
“AI PDF reader” covers three kinds of tool: full PDF editors with an assistant added, chat tools you upload a document to, and readers built around an assistant. The right pick depends on which job you have.
A note on bias: we make Plum, and it is on this list. We’ve tried to be fair to every tool, listed Plum’s downsides alongside the others’, and checked each product’s claims against its official pages. Prices are left out because they change often; follow the links for current plans.
Quick picks
- Plum: reading and understanding research papers on a Mac.
- Adobe Acrobat with AI Assistant: people who need a complete PDF toolkit with AI on top.
- UPDF: an affordable all-in-one editor across every device.
- PDF Expert: a polished native Mac and iPad editor with AI included.
- ChatPDF: asking quick questions about a PDF with no setup.
- NotebookLM (Gemini Notebook): research Q&A across many sources at once.
- ChatGPT: analyzing, rewriting, or combining PDFs with other work.
1. Best for reading and understanding research papers on a Mac
Plum
A native, keyboard-first PDF reader whose assistant works inside the reader: ask a question and it jumps to the passage and highlights the exact lines it used. Papers are processed on your Mac, and you can bring your own AI key or connect an agent like Claude.
- Platforms
- Mac (macOS 15 or later)
- Pricing
- Pro subscription with a 7-day free trial; covers the reader, local processing, the assistant, and your own AI
Strengths
- The assistant drives the reader: it turns to the page and highlights only text it actually found
- Semantic, exact, and LaTeX math search within a paper
- PDFs are processed on your Mac; only the passages the assistant reads go to the AI
- Bring your own key for any OpenAI-compatible provider, or connect Claude Code or Claude Desktop over MCP
- Equations copy as LaTeX; citations preview on hover
Downsides
- Mac only, and still in early access
- A reader, not an editor: no editing, form filling, or signing
- Newer and smaller than the established tools
2. Best for people who need a complete PDF toolkit with AI on top
Adobe Acrobat with AI Assistant
The reference PDF suite, with an AI Assistant that summarizes, answers questions, and links its citations to the source in your documents.
- Platforms
- Mac, Windows, web, iOS, Android
- Pricing
- Subscription; AI Assistant is included in some plans and a paid add-on in others
Strengths
- The most complete PDF toolset: editing, forms, signing, OCR, and conversion
- Citations that link back to the source in your documents
- Adobe states your content is never used to train its AI models
Downsides
- AI Assistant costs extra on some plans
- Built around editing and business documents rather than reading research
- No option to use your own AI provider
Visit Adobe Acrobat with AI Assistant · Plum vs Adobe Acrobat with AI Assistant
3. Best for an affordable all-in-one editor across every device
UPDF
An all-in-one PDF editor with an AI assistant for chat, summaries, translation, and mind maps, on every major platform.
- Platforms
- Mac, Windows, iOS, Android, web
- Pricing
- Yearly or lifetime license; UPDF AI is a separate subscription
Strengths
- One license across Mac, Windows, iPhone, and Android, with a lifetime option
- AI chat across many PDFs at once, plus translation and mind maps
- Full editing, annotation, OCR, and conversion
Downsides
- AI is a separate subscription from the editor
- Online AI features mean uploading your documents
- No option to use your own AI provider
4. Best for a polished native Mac and iPad editor with AI included
PDF Expert
Readdle’s native PDF editor for Apple devices, with PDF Copilot for questions, summaries, and key points included in every plan.
- Platforms
- Mac, iPhone, iPad
- Pricing
- Yearly plans or a Mac lifetime license; AI included
Strengths
- Polished native app for Mac, iPhone, and iPad
- Editing, forms, signatures, OCR, and conversion
- AI included in the price, with answers that point to locations in the PDF
Downsides
- AI works one document at a time
- AI requests are capped by a quota
- No option to use your own AI provider
5. Best for asking quick questions about a PDF with no setup
ChatPDF
Upload a PDF and chat with it. Answers come with citations that jump to the original text, and folders let you chat across several files.
- Platforms
- Web, with desktop and mobile apps
- Pricing
- Free tier with a daily limit; Plus subscription
Strengths
- Nothing to install and no account needed to start
- Citations that jump to the original passage
- Accepts Word, PowerPoint, and text files as well as PDFs
Downsides
- Your documents are uploaded to ChatPDF
- A chat window beside a document, not a reader built for long papers
- The free tier limits how many documents you can use each day
6. Best for research Q&A across many sources at once
NotebookLM (Gemini Notebook)
Google’s research notebook, renamed Gemini Notebook in July 2026. Add many sources and ask questions grounded in them, with inline citations and Audio Overviews.
- Platforms
- Web
- Pricing
- Free tier; higher limits with Google AI plans
Strengths
- Strong grounded answers across many sources, with inline citations
- Audio Overviews and other study formats
- Generous free tier
Downsides
- Web only, with no native Mac app
- Your documents are uploaded to Google
- A workspace for sources, not a PDF reader
Visit NotebookLM (Gemini Notebook) · Plum vs NotebookLM (Gemini Notebook)
7. Best for analyzing, rewriting, or combining PDFs with other work
ChatGPT
Upload PDFs to a chat or a Project and ask anything: summaries, comparisons, table extraction, rewriting. Works alongside Preview or any reader.
- Platforms
- Mac, Windows, web, iOS, Android
- Pricing
- Free tier; paid plans
Strengths
- The strongest general reasoning and writing of the group
- Handles large files, many formats, and multi-file Projects
- Native Mac app
Downsides
- Your documents are uploaded to OpenAI
- No PDF viewer: answers can’t turn to the page in your reader
- You switch between the chat and your PDF reader
How to choose
- You edit, sign, or fill PDFs: Adobe Acrobat, UPDF, or PDF Expert.
- You need Windows or Android: Adobe Acrobat or UPDF, or ChatGPT and NotebookLM in a browser.
- You want a quick answer from one document: ChatPDF or ChatGPT.
- You synthesize across many sources: NotebookLM.
- You read research papers closely on a Mac: Plum, which answers on the page and lets you use your own AI.
For a comparison by category rather than by product, see how Plum compares.