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NotebookLM is a free AI research tool provided by Google.
When you upload materials such as PDFs or web pages, the AI analyzes the content and can answer questions or generate summaries for you.
Think of it as a brilliant research assistant that reads through your documents and explains them to you.
NotebookLM's standout feature is a function called Audio Overview.
This feature takes the content of your uploaded materials and converts it into a natural, podcast-style conversation between two AI hosts.
You can listen to and learn from complex documents during your commute or while doing household chores.
As of April 2026, NotebookLM supports more than 50 languages, including Japanese.
It is completely free to use, and commercial use (using it for business purposes) is generally unrestricted.
Anyone with a Google account can get started right away.
NotebookLM offers a wide range of useful features to make learning and work more efficient. Here are five of the main features.
You can load various types of materials, including PDF files, Google Docs, web pages, and YouTube videos.
Ask the AI questions about the loaded content — such as "Explain this section simply" or "What are the key points?" — and it will provide accurate answers based on the material.
The difference from ChatGPT is that it only references the documents you have uploaded.
The tool automatically generates audio in which two AI hosts have a conversation to explain the content of your materials.
The result is natural-sounding audio, as if professional podcasters were walking you through your documents in an easy-to-understand way.
The Japanese pronunciation and intonation are remarkably natural — you'd hardly believe it's AI speaking.
You can make the most of time when you can't look at a screen, such as during your commute or while exercising.
An update in February 2026 added the ability to automatically generate presentation slides from your document content.
The generated slides can be downloaded in PowerPoint format (PPTX).
This can dramatically reduce the time you spend preparing for meetings or classes.
You can also request adjustments via prompts (instruction text), making fine-tuning easy.
The tool automatically creates study flashcards (memorization cards) and quizzes from your document content.
A March 2026 update added the ability to resume from where you left off and to record correct and incorrect answers.
This is ideal for exam preparation or studying for certifications.
A card shuffle feature is also available, so you don't have to worry about memorizing content just by its order.
The tool automatically generates infographics — visual representations of information using charts and illustrations — from your document content.
It is powered by Google's latest image generation model, "Nano Banana Pro," which can accurately render large amounts of Japanese text into visual diagrams.
Complex data and processes are transformed into easy-to-understand visuals at a glance.
NotebookLM can be set up in just three steps, even for beginners. Here's a guide to the basics.
First, go to the official NotebookLM website (https://notebooklm.google/?hl=ja).
Log in with your Google account and you can get started immediately.
You don't need to create a new account.
Your existing Gmail account is all you need.
After logging in, you'll see a list of your notebooks (the units used to organize your materials).
Click the "Create new notebook" button and give your notebook a descriptive name (e.g., "Marketing Materials" or "English Paper Summary").
Next, upload your materials.
PDFs and text files can be added simply by dragging and dropping them onto the screen.
Google Docs and Google Slides can be selected directly from Google Drive.
The free version allows you to load up to 50 documents into a single notebook.
Once your materials are uploaded, a chat box will appear at the bottom of the screen.
Type questions in Japanese such as "Give me three key points from this document" or "Explain [topic] in detail," and the AI will respond based on the content of your materials.
You can also click the "Studio" button to generate various types of content, including Audio Overviews, slides, and more.
Audio is generated within a few minutes and can be downloaded as well.
NotebookLM has both convenient features and aspects to be aware of. Before you start using it, here's what you should know.
NotebookLM is perfect for people who handle large volumes of materials for study or work. Specifically, it's recommended for:
On the other hand, NotebookLM is not suitable for people who want AI to write creative content from scratch, or who want real-time access to the latest news.
That's because NotebookLM is a tool for understanding materials that already exist.
If you want to generate new content, ChatGPT or Gemini would be a better fit.
NotebookLM is a free AI research tool provided by Google that can dramatically streamline how you understand documents and learn. Here's a summary of the key points in this article, including the latest features as of April 2026.
NotebookLM is an exceptionally powerful tool, especially for students and professionals who need to read through large volumes of materials, people who want to make the most of their commute time, and those looking to streamline preparation for classes or meetings.
Since it's fully functional for free, why not visit the official website (https://notebooklm.google/?hl=ja) and try uploading some of your own materials?
Experience what it's like to have AI support your learning and work firsthand.
This article is a cross-post from AI Friends.
