What Is NotebookLM? How to Use Google's Free AI Tool and What It Can Do [Latest 2026]
機械翻訳 / Machine-translated
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機械翻訳 / Machine-translated
@aifriends
AI Friends(https://aifriends.jp)のクロスポスト公式アカウント。AIツールの紹介・使い方・できることを、中学生でもわかるやさしい日本語で届けます。
What you'll learn in this article
Are you struggling with how long it takes to read through documents?
NotebookLM is a free AI-powered note-taking tool developed by Google.
Simply upload a PDF or document, and the AI will read and summarize it for you.
It can even explain content in a podcast-style audio format, so you can keep learning on the go.
In this article, we'll walk you through how to use NotebookLM and what it can do — explained simply enough for anyone to understand.
NotebookLM is an AI-powered note-taking tool developed by Google.
It uses an LLM (Large Language Model) — an AI that understands and responds to text the way a human would.
Its biggest feature is what's called a "source-grounded design."
This means the AI only uses the documents you upload to generate its answers.
As a result, it significantly reduces "hallucinations" — instances where AI fabricates false information on its own.
NotebookLM officially launched in Japanese in June 2024 and now supports more than 50 languages.
Anyone with a Google account can start using it for free.
It's used for a wide range of purposes, from student studying to organizing business documents.
NotebookLM offers a variety of useful features for making the most of your documents.
Here are 5 particularly valuable features worth knowing about.
Upload a lengthy PDF or academic paper, and the AI will condense it into just the key points.
Even a 100-page document can be summarized in just a few minutes.
Two AI hosts explain the content of your documents in a podcast-style conversation.
You can learn by listening during your commute or while doing household chores.
An April 2025 update added support for more than 80 languages, including Japanese.
You can also download the audio and take it with you.
You can ask any question about the documents you've uploaded.
Just ask things like "What's the conclusion of this document?" or "Summarize the key points of Chapter 3."
The AI searches through your documents and explains the answers in an easy-to-understand way.
This is a new feature added in a 2026 update.
It automatically creates a mind map — a visual diagram of information — that organizes the structure of your documents.
Even complex content becomes easy to grasp at a glance.
Based on your chat conversations, the tool can automatically generate a neatly formatted report document.
It's useful for meeting minutes and research summaries.
You can also combine multiple documents into a single report.
You can get started with NotebookLM in just 4 steps.
It works the same way on both computers and smartphones.
Search for "notebooklm.google" in your browser, or go there directly.
Log in with your Google account (free).
Click the "New Notebook" or "Create" button.
You can organize your documents by project within separate notebooks.
Click the "Add Source" button to upload your documents.
Supported file types include:
With the free version, you can upload up to 50 sources per notebook.
Once your upload is complete, you're ready to go.
Type a question in the chat box, or click the "Audio Overview" button.
Audio Overview takes a few minutes to generate, but the finished result is typically 10–20 minutes of audio.
A 2026 update also added an "interactive mode" that lets you join the conversation.
You can even speak up and say things like "Tell me more about that."
Every tool has its strengths and things to watch out for.
Here's what to keep in mind before using NotebookLM.
If you need to handle sensitive business documents, the paid NotebookLM Enterprise version is recommended.
NotebookLM is especially recommended for people like these:
It's especially perfect for anyone who thinks, "I want to read the material, but I just don't have the time."
With AI support available 24 hours a day, you can learn at your own pace.
In this article, we covered how to use NotebookLM and what it can do.
Here's a quick recap of the key points:
Using NotebookLM can dramatically cut down the time you spend reading documents.
We recommend trying the free version first — and if you find it useful, consider upgrading to the paid plan.
Why not start using NotebookLM today for more efficient studying and work?
This article is a cross-post from AI Friends.