How to summarise a PDF with AI for free
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Ranked on published features, free-plan limits and beginner ease (checked 14 October 2026). We have not benchmarked these tools hands-on, and commissions don’t affect rankings.
Summarising a long PDF is one of the most useful things AI does, and you can do it for free. The trick is choosing a tool that stays close to the document, then checking the bits that matter.
Decide in 30 seconds
- Need to see where each point came from → NotebookLM
- Very long report → Claude free
- Quick summary and follow-ups → ChatGPT free
- File already in Google Drive → Gemini
- Paper I’m citing in my essay → Jenni AI
Our top picks
Gemini Notebook
Who it’s for: Students and researchers who want answers that point back to the page.
Worth knowing: Source-grounded answers still need checking against the original document.
Claude
Who it’s for: Long reports and dense reading, on the free plan within its limits.
Worth knowing: Free usage is limited; long sessions may need a paid plan.
ChatGPT
Who it’s for: Quick summaries and follow-up questions, plus file analysis.
Worth knowing: Answers can sound confident and still be wrong. Check important facts.
Gemini
Who it’s for: People who already keep their files in Google.
Worth knowing: Connected apps and model access depend on your account, region and plan.
Jenni AI
Who it’s for: Students writing an essay who want to question PDFs and cite them.
Worth knowing: Easy to over-rely on. Write your own ideas first, check every citation and follow your course’s AI rules.
Visit Jenni AI ↗ (opens in new tab) (paid link: we may earn a commission)
Side-by-side comparison
| NotebookLM | Claude | ChatGPT | Gemini | Jenni AI | |
|---|---|---|---|---|---|
| Shows sources | Yes | No | No | No | Citations in your draft |
| Free option | Free with Google account | Free plan | Free plan | Free with Google account | 10 PDF uploads |
| Watch out for | Upload limits | Free usage limits | Usage limits | Plan varies by country | Tight free limits |
Pricing
| Tool | Free | Entry paid |
|---|---|---|
| NotebookLM | Free with a Google account | Google AI Plus: US$4.99/month (US listing) |
| Claude | Free plan | Pro: US$20/month |
| ChatGPT | Free plan | Go: US$8/month |
| Gemini | Free with a Google account | Google AI Plus: US$4.99/month (US listing) |
| Jenni AI | Free: 10 PDF uploads | Plus: US$12/month |
Prices checked on 14 October 2026 from official pricing pages (official pricing pages for Google AI plans, Claude, ChatGPT and Jenni AI). Prices are shown as listed, in US dollars (USD). Australian prices, GST and app-store pricing can differ, and plans change often, so confirm on the provider’s site before you pay.
How to get started
Open NotebookLM (or Claude or ChatGPT) and upload the PDF.
Ask for a one-paragraph overview, then the key points as bullets.
Ask follow-up questions, such as “What evidence supports point 3?”
Open the page each important point came from and check it.
How we chose
We picked tools with free plans that accept PDF uploads, using official product and pricing pages. We haven’t benchmarked summary accuracy.
A prompt that works
“Summarise this PDF for [audience] in: 1) a one-sentence overview, 2) 5–7 key points, 3) any numbers, dates or decisions, 4) anything unclear. Quote the original for anything important.” Our free prompt generator has a “Summary” option too.
NotebookLM: summaries that cite the page
NotebookLM answers from the sources you upload and shows where each answer came from, so it’s easy to check. It can also make study guides, quizzes and audio overviews. Upload limits apply, and higher limits need a Google AI plan.
Claude, ChatGPT and Gemini
Claude is good at reading and summarising long documents, though free usage limits can be reached quickly on long tasks. ChatGPT handles file analysis and follow-up questions. Gemini works well if your files live in Google. All three can make mistakes, so check anything important.
Jenni AI for research papers
Jenni AI (opens in new tab) (paid link: we may earn a commission) lets you upload PDFs and ask questions about them while you write, with citations in many styles. The free plan includes 10 PDF uploads. See how to use Jenni AI.
Privacy
Don’t upload confidential, personal or client documents to a free AI tool unless your organisation allows it.
Who this isn’t for
- Legal, medical or financial decisions based only on an AI summary: read the original or ask a professional.
- Scanned PDFs with poor image quality, which can be read incorrectly.
Our verdict
Start with NotebookLM for checkable summaries, use Claude for very long documents, and choose Jenni AI when the PDF feeds into your own essay. See also free AI research tools for students.
Frequently asked questions
What is the best free AI to summarise a PDF?
NotebookLM is a strong free choice because it shows where each point came from. Claude, ChatGPT and Gemini also summarise uploaded PDFs on their free plans, within usage limits.
Can ChatGPT summarise a PDF for free?
Yes. ChatGPT’s free plan supports file analysis, within usage limits that change over time.
Is NotebookLM free?
Yes, with a Google account. Higher limits come with a Google AI plan.
How accurate are AI PDF summaries?
Usually helpful but not perfect. They can miss nuance or misread tables, so check important points against the original.
Is it safe to upload PDFs to AI?
Avoid uploading confidential or personal documents unless your organisation has approved the tool.
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Prices in US dollars; Australian GST and currency conversion may apply. Confirm the final price at checkout.