NotebookLM
Google's assistant that reads your documents — and turns them into a conversation.
By Thiago Lourenço Martins
A reader that understands everything you throw at it
NotebookLM is a free tool from Google. You upload your files — a PDF, a document, a website link, even a YouTube video — and it answers questions about that content, writes summaries, and turns it all into a podcast with two hosts having a conversation. What sets it apart from a regular chat: it only answers based on what you uploaded — it doesn't make things up, and it shows you which passage each answer came from.
The 60 pages you keep putting off become audio
A 60-page contract. A technical report. A government booklet packed with hard-to-read jargon. You know you need to understand it — but just seeing how long it is wears you out.
Upload the document, ask for the "audio overview," and you get an episode with two hosts walking through the main points, in English. You listen while doing something else — and you finish with the big picture before you've even opened the file.
How people in different fields use it
Found a great but dense article in PDF form. Generate the podcast and play it as an intro to the topic — it engages more than slides.
Before a meeting, upload an 80-page contract and ask about the penalty clauses. Get the answer with the page cited.
Wants to understand a tax rule before talking to the accountant. Upload the official guide and ask in plain language.
From zero to your first podcast
- Go to notebooklm.google.com
Click "Sign in with Google." Any Gmail account works.
- Create a "New notebook"
Give the topic a name.
think of it as a folder for the subject - Add your sources
In the "Sources" panel, click "Add": PDF (up to 200 MB), pasted text, a website link, or a YouTube video link. On the free plan: up to 50 sources per notebook.
- Ask a question in the chat
In plain English: "What are the main risks in this document?"
the answer comes with the passage and page cited - Generate the podcast (Audio Overview)
In the "Studio" panel, pick the output language English, the "Deep Dive" format, and click Generate.
- Listen and download
Hit play, or the download icon to listen offline.
A ready-made request for the chat box
Give me an executive summary of this document in no more than 5 bullet points, in plain language and free of jargon. For each point, indicate the source page or passage. At the end, list the 3 most important questions this document still leaves unanswered.
You get 5 points with a source for each, plus 3 open questions.
Tips & common mistakes
Do this
- Upload several sources in the same notebook — it cross-references them all in its answers.
- Use the Study Guide or the Mind Map in Studio to review in a different way.
- The audio language is independent of the file: upload something in another language and listen in English.
Avoid
- Uploading a scanned PDF (a photo of text). It can't read images — check whether you can select the text.
- Expecting to chat with the hosts in every language — the interactive mode is only available in English.
- Asking about things outside the document. It replies "I couldn't find that in the sources" — that's protection, not a bug.
Try it now with a file of your own
Grab any PDF from your desktop — a contract, a booklet, an article. Upload it to NotebookLM and ask: "What is the most important piece of information in this document that I shouldn't ignore?"
It worked if you get an answer with at least one passage cited, in English, in under 15 seconds.
Our take on NotebookLM
score 4.6 out of 5
Here's how I'd put it: throw a 60-page document you've been putting off at it, and in minutes you get a summary with cited sources plus a podcast to listen to on the go. It's slightly surreal. For studying YOUR OWN documents, this is probably the best free tool out there today — it answers only from what you upload and shows exactly where it got each answer. It's not a do-everything assistant (outside your files it doesn't chat) and the free plan's daily limits are tight for heavy use. But as a study tool, it's rare to find one this good.
Tested and checked against official sources on July 2, 2026.
What's in its favor
- Responds using only YOUR files and shows a clickable citation for every answer.
- The audio summary (the famous 'two-host podcast') works in Portuguese, with dozens of languages and formats supported.
- Generous free plan and no card: 100 notebooks with 50 sources each, and each source up to 500,000 words.
- Accepts nearly everything as a source: PDF, Word, PowerPoint, pasted text, websites, YouTube videos, audio files.
Where it complicates
- Interactive podcast mode (talking to the hosts by voice) only exists in English, and choosing audio length isn't available yet.
- Free-tier daily limits are tight for heavy users: 3 audio summaries and 3 video summaries a day, 50 chat questions.
- There's no standalone NotebookLM subscription: raising limits means subscribing to the whole Google AI package.
- It's not a general-knowledge chat: if the information isn't in your sources, it doesn't answer — and Google itself warns it can still get things wrong.
Who NotebookLM makes sense for
Great fit if you…
- are a student or exam-prep candidate: upload textbooks and PDFs and get summaries, a Portuguese podcast, flashcards and quizzes.
- are a teacher who wants to turn an article or class material into audio, a study guide or a quiz for students, with little effort.
- need to understand contracts, reports, bids and regulations: ask in Portuguese and get an answer with the source cited.
Look elsewhere if you…
- want a general assistant to write text from scratch, brainstorm or chat about anything — try ChatGPT or Gemini instead.
- need answers about current news from the internet without uploading a file — Perplexity is built for that.
- want to automatically record and summarize meetings — NotebookLM doesn't join calls; Fathom and Otter do.
How much NotebookLM costs
The free plan is generous and permanent — 100 notebooks, 50 sources each, with podcast, summary and citations. What the paid tiers buy is higher daily limits, not an essential new feature.
R$ 0 — 100 notebooks, 50 sources per notebook, podcast and summary in Portuguese, citations everywhere. No card.
R$ 24.99/mo — 200 notebooks, more chats and audio per day. Comes bundled with Google AI, not standalone.
R$ 96.99/mo — 500 notebooks, much higher limits. For heavy daily studying.
from R$ 779.90/mo — maximum limits and lots of storage. The top of the line.
Important detail: there is no standalone NotebookLM subscription — raising limits means subscribing to the whole Google AI package. Official prices as of July 2026.
Questions from people just starting
Is NotebookLM really free?
Yes. It has a full, permanent free plan: just sign in at notebooklm.google.com with a Google account.
Do I need a credit card?
No. The free tier doesn't ask for one.
Does it work in Portuguese?
Yes, including the audio summary — the famous two-host podcast is available in Portuguese.
Does it work on mobile?
Yes, in the browser on your phone; the app has been rolling out gradually.
Are my documents safe? Does the AI train on them?
Google states your files and conversations are not used to train the model unless you opt in.
What file types can I upload?
PDF, Word, PowerPoint, pasted text, websites, YouTube videos and audio files (auto-transcribed).
Can it make things up?
It can, though less than a general chatbot, since it answers from your own sources — always check the cited passage.
What happens when my daily limit runs out?
You wait for it to reset the next day, or upgrade to a paid Google AI plan for higher limits.
Other options that may serve better
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