AI tools to summarize long PDFs
AI tools for long PDFs and documents, ranked by fit: summaries, question answering with page citations, and working across many files at once.
Summarising a PDF is easy to demo and easy to get wrong. The tools worth using show where in the document an answer came from, so you can check it, and handle long files without silently dropping the middle.
A general assistant with file upload covers the occasional document. If you work through reports, contracts or papers every week, a dedicated tool that keeps a library and cites pages will save more time.
Top 8 tools for this
ChatPDF
Upload a PDF and chat with its contents: ask questions, get summaries and locate specific passages.
Built for working through PDFs and documents and summarising long content.
Pricing information is currently unavailable. · Free plan · Checked October 4, 2026
Humata
AI document Q&A that works across multiple uploaded files and returns answers with references to the source text.
Built for working through PDFs and documents and summarising long content.
From $9.99/month · Free plan · Checked October 4, 2026
NotebookLM
Google's AI notebook that grounds every answer in your uploaded documents, PDFs and audio files with source citations.
Built for working through PDFs and documents and summarising long content.
From $9.99/month · Free plan · Not yet verified by our editors. Confirm on the official site.
Elicit
An AI research assistant for literature reviews that searches academic papers and extracts key findings into structured tables.
Built for working through PDFs and documents and summarising long content.
From $49/month, billed annually · Free plan · Checked October 4, 2026
Julius AI
An AI data analyst that accepts uploaded spreadsheets and lets you ask questions, generate charts and run statistical analysis in plain language.
Built for working through PDFs and documents and summarising long content.
From $20/month · Free plan · Checked October 4, 2026
Perplexity
An AI search assistant that answers questions with cited web sources and supports multi-step deep research reports.
Built for working through PDFs and documents and summarising long content.
Pricing information is currently unavailable. · Free plan · Not yet verified by our editors. Confirm on the official site.
SciSpace
An AI tool for reading research papers with inline concept explanations, full-paper Q&A and related literature discovery.
Built for working through PDFs and documents and summarising long content.
Pricing information is currently unavailable. · No free plan on record · Not yet verified by our editors. Confirm on the official site.
ChatGPT
OpenAI's AI assistant for questions, writing, coding and research, with a free tier and paid plans for more capable models.
Built for working through PDFs and documents; also covers summarising long content, though it is not its main job.
From $8/month · Free plan · Checked October 4, 2026
How these are ranked: Tools are ordered by the advisor's match score for this use case alone: no budget, skill level or other preference is assumed. Tell the advisor yours to get a personal top three.
What to check before you choose
- Page or passage citations on every answer
- File size, page and upload limits on the plan you would buy
- Whether scanned PDFs are read (OCR)
- How your documents are stored, and whether they are used for training