How to Organize NotebookLM Sources with Folders

If you've ever worked on a large research project in NotebookLM, you know the pain: dozens of sources stacked in a single flat list with no way to group, categorize, or visually separate them. Finding the right document means scrolling and scanning every time.

NotebookLM source folders solve this problem by letting you organize sources into named groups — directly inside NotebookLM, with simple drag-and-drop interaction.

In this guide, I'll show you how source folders work, how to create and manage them, and share workflow tips that make a real difference for researchers handling complex projects.

The Problem with Flat Source Lists

NotebookLM's default source panel is a flat list. Every source you add — whether it's a PDF, a web page, a YouTube video, or a Google Doc — appears in the same undifferentiated stream.

This is fine when you have five or ten sources. But research projects grow quickly. A literature review might involve 30+ papers. A market analysis could include competitor websites, industry reports, news articles, and internal documents. A course notebook might contain lecture notes, textbook chapters, and supplementary readings.

Without organization, you face these problems:

• Slow navigation — scrolling through dozens of sources to find what you need
• Lost context — forgetting which sources relate to which subtopic
• Cognitive overhead — your brain has to mentally categorize sources every time you look at the list
• Messy collaboration — if you share a notebook, others have no way to understand your source structure

Source folders address all of these by adding a layer of visual and structural organization that NotebookLM itself doesn't provide.

How Source Folders Work

Source folders are provided by the NotebookLM Tools extension. Once installed, you'll see folder management options in the source panel.

Creating Folders

To create a new folder, click the folder icon in the source panel toolbar. Give it a descriptive name — something that reflects the category of sources it will contain.

You can create up to 50 folders per notebook, which is more than enough for even the most complex research projects. Each folder can hold any number of sources.

Drag and Drop Organization

Once your folders exist, organizing is as simple as dragging a source and dropping it into a folder. The interaction feels natural — exactly like moving files into folders on your desktop.

You can also:

• Move sources between folders by dragging them
• Remove a source from a folder back to the root level
• Collapse and expand folders to reduce visual clutter
• Rename folders as your project evolves

Folder Structure Examples

Here are a few ways researchers typically organize their folders:

By topic or theme:

• Background Research
• Methodology
• Case Studies
• Competing Approaches

By source type:

• Academic Papers
• Web Articles
• YouTube Videos
• Internal Documents

By project phase:

• Phase 1 — Discovery
• Phase 2 — Analysis
• Phase 3 — Synthesis

By priority:

• Primary Sources
• Supporting Evidence
• Reference Material

The right structure depends on your project. The key is that folders let you impose whatever organization makes sense for how you think about the material.

Step-by-Step: Setting Up Source Folders

Step 1: Install NotebookLM Tools

If you haven't already, install NotebookLM Tools from the Chrome Web Store. It works on Chrome, Edge, Brave, and other Chromium-based browsers.

Step 2: Open Your Notebook

Navigate to NotebookLM and open the notebook you want to organize. Your existing sources will appear in the source panel as usual.

Step 3: Create Your Folder Structure

Before dragging sources, think about the categories that make sense for your project. Create 3-5 folders to start — you can always add more later.

Step 4: Sort Sources into Folders

Drag each source into the appropriate folder. If a source could belong to multiple categories, pick the most relevant one — you can always move it later.

Step 5: Collapse for Clarity

Once organized, collapse the folders you're not actively working with. This dramatically reduces visual noise and lets you focus on the sources that matter right now.

Workflow Tips for Researchers

Create folders before you start importing. If you know the general structure of your research project, set up folders first. Then as you import sources, drop them directly into the right folder. This prevents the "pile of unsorted sources" problem from ever forming.

Use a naming convention. Prefix folder names with numbers (01, 02, 03) to control their display order, or use emoji-free descriptive names that make sense at a glance.

Combine folders with right-click import. When you right-click to add web pages during a browsing session, follow up by organizing the new sources into folders before they pile up.

Reorganize as your understanding evolves. Research projects shift as you learn more. Don't be afraid to rename folders, merge categories, or create new ones. The drag-and-drop system makes reorganization fast.

Use folders to scope your AI conversations. When you select sources in NotebookLM to include in a chat, folders help you quickly identify and select the right subset. Instead of scanning a long list, expand the relevant folder and select the sources within it.

Frequently Asked Questions

How many folders can I create?

You can create up to 50 folders per notebook. Each folder can contain any number of sources.

Can I nest folders inside other folders?

Currently, folders are a single level — you cannot create subfolders. For most research projects, one level of organization is sufficient. If you need more granularity, consider using descriptive folder names that encode hierarchy (e.g., "Research > Methods" or "Ch1 - Introduction").

Do folders affect how NotebookLM's AI works?

No. Folders are purely organizational. They don't change how NotebookLM indexes, searches, or generates responses from your sources. The AI still has access to all sources regardless of which folder they're in.

Can I move sources between folders?

Yes. Simply drag a source from one folder to another. You can also drag it back to the root level if you want to unfolder it entirely.

Bring Structure to Your Research

Flat source lists work for simple projects, but serious research demands organization. Source folders give you a fast, visual way to structure your materials so you can spend less time managing and more time thinking.

Install NotebookLM Tools to start organizing your sources today, and explore the full set of features designed to make NotebookLM work the way research actually happens.

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Related articles:

• Keep Your NotebookLM Sources Up to Date — Detect stale sources and sync them with one click.
• NotebookLM Tips #1: Organizing Notebooks — Foundational tips for notebook-level organization.
• NotebookLM Tips #3: All the Ways to Import Sources — Every method for getting sources into NotebookLM.