Google's new Notebooks feature connects Gemini and NotebookLM, but the privacy model splits in ways that matter for professional users.
Your documents are safe. Your conversations might not be. Here's how to tell the difference.
Google Just Merged Gemini and NotebookLM. Here’s What That Means for Your Firm.
TL;DR: Google launched “Notebooks” in Gemini this week, connecting it directly with NotebookLM. Think of it as Google’s answer to Projects in ChatGPT and Claude. It’s a dedicated workspace where you can organize sources, files, and conversations around a single topic. The sync between the two apps is genuinely useful. But the privacy picture is more complicated than Google is advertising, and it hasn’t rolled out to Workspace (business) accounts yet. If you’re advising clients or handling sensitive material, you need to understand what changed before you start using it.
I Was Standing in Front of 40 Attorneys When This Dropped
I was presenting to a group of attorneys earlier this week, walking them through just how powerful NotebookLM can be. Upload your deal documents, your case files, your regulatory filings. Ask questions. Get answers grounded in your actual sources, with citations. No hallucinated case law. No wandering off into the internet.
It’s one of the tools I recommend most to my legal and PE clients. I’ve been using it since it launched, and I’ve watched dozens of firms build it into their daily work.
And then, mid-presentation prep, Google announced they’re merging NotebookLM directly into Gemini.
My first reaction: this is great. My second reaction: wait, what happens to the privacy model?
Both reactions turned out to be right.
What Google Actually Built
Google introduced a feature called “Notebooks” inside the Gemini app. The naming is a little confusing since NotebookLM already has notebooks. But here’s the simple version.
You can now create a dedicated workspace inside Gemini, attach files to it (PDFs, Google Docs, website URLs, YouTube videos, pasted text), set custom instructions, and have all your conversations within that workspace stay organized in one place. Those notebooks sync automatically with NotebookLM. Add a source in Gemini, it shows up in NotebookLM. Update your custom instructions in NotebookLM, it syncs to Gemini.
Google’s own language is telling. They’re calling notebooks “personal knowledge bases shared across Google products.” That’s not a minor label. They’re positioning this as a persistent layer of context that follows you across their entire product suite, starting with these two apps.
If you’ve used Projects in ChatGPT or Claude, you’ll recognize the concept immediately. A contained space. Dedicated context. No information bleeding across workspaces. Every one of my clients cares about that separation, especially when they’re handling client matters or confidential deal information.
Why the Two-App Model Is Actually Smart
Here’s what makes Google’s approach different from what OpenAI and Anthropic have done with Projects.
NotebookLM and Gemini are good at different things. NotebookLM is a research tool. It stays grounded exclusively in your uploaded sources. It won’t go to the web. It won’t hallucinate from training data. When it answers a question, it pulls from what you gave it and shows you exactly where.
Gemini is a general-purpose assistant. It can search the web, write drafts, reason across topics, and use Google’s full model capabilities. But until this week, Gemini had no dedicated project workspaces. You could reference past chats and add NotebookLM as a source, but there was no persistent, organized container for all your project materials in one place.
Now they talk to each other. You can upload your source documents in NotebookLM, generate an Audio Overview or a slide deck from them, and then jump into Gemini to ask follow-up questions about those same documents while also pulling in live web data. No exporting. No re-uploading. No copying files between apps.
Custom instructions sync across both. Sources sync across both. It’s genuinely useful for anyone running multi-week projects.
The Privacy Problem Nobody’s Talking About
Here’s where it gets complicated. And this is the part that matters most if you’re a law firm, a PE shop, or any business handling confidential information.
NotebookLM has always had a clean privacy story. Your uploaded sources stay private. Your chats are not used to train Google’s models. Period. That hasn’t changed.
But the moment you start chatting with your notebook through Gemini’s consumer app, different rules apply. Google’s own support page spells it out: chats in Gemini are governed by your “Keep Activity” settings and the Gemini Apps Privacy Hub. Translation: if you haven’t disabled activity tracking in the consumer version of Gemini, your inputs and outputs can be used for model training.
Let me say that more plainly. Your documents in the notebook? Not trained on. Your chats about those documents in NotebookLM? Not trained on. Your chats about those same documents in Gemini? Potentially trained on, unless you’ve changed your settings.
That’s a meaningful distinction. And it’s one that most users won’t notice.
I spent some time chatting with Gemini 3.1 Pro about this to confirm. The notebooks themselves, just because they’re connected to Gemini, aren’t being trained on. But the conversation layer in Gemini operates under Gemini’s privacy rules, not NotebookLM’s.
There’s another wrinkle worth knowing. Your NotebookLM chats don’t appear over in Gemini. But your Gemini chats do appear in NotebookLM, as read-only context in your sources panel. And if you’ve opted in to “shared context,” collaborators on a shared notebook can see those Gemini chats too.
The Deletion Quirk You Need to Know
One more thing that tripped me up. When you delete a notebook, it destroys the container, the source documents, and the NotebookLM artifacts. But it does not delete your Gemini chat history. Those conversations get ejected from the notebook and returned to your main Gemini chat list.
For anyone managing client matters with retention policies, that’s a detail you can’t ignore. Deleting the project doesn’t mean deleting the conversation trail in Gemini.
A Few Things I Discovered Poking Around
Shared notebooks don’t show up in Gemini. At all. I have several shared notebooks, some that colleagues created and shared with me, others that I created with public link sharing enabled. None of them appeared in my Gemini notebook list. When I turned off the public link on one of my notebooks, it immediately showed up.
Only notebooks that are truly yours, unshared, private, appear in Gemini. That’s actually a reasonable privacy choice by Google, but it’s not documented anywhere obvious.
Also worth noting: Gemini can’t generate NotebookLM Studio artifacts. No Audio Overviews, no Video Overviews, no Infographics from within Gemini. You still need to go to NotebookLM for those. The sync is for sources and context, not for the full feature set.
The Big Gap: Workspace Users
Here’s the thing that will matter most to my readers. This feature is currently rolling out to consumer accounts only. Google AI Ultra, Pro, and Plus subscribers on the web. Google’s own footnotes confirm that Notebooks in Gemini are not available for Workspace or Education accounts yet.
That’s the gap. The businesses that would benefit most from this, law firms, consulting shops, financial services, are exactly the ones who can’t use it yet.
Google Workspace accounts already have strong privacy protections. Content isn’t used for model training. Human reviewers don’t see your data. Enterprise-grade security is baked in. If Google brings this same Notebook integration to Workspace with those protections intact, it could be a significant differentiator.
But we don’t know when that’s coming, and we don’t know if the privacy model will carry over cleanly. I truly hope it does. Because right now, Workspace users who need project-style workspaces are still better served by Claude Projects or ChatGPT Projects, both of which are available today with business-grade privacy.
What to Do Next
If you’re a consumer Gemini user, check your Keep Activity settings right now. Go to myactivity.google.com and review what Gemini is tracking. Decide whether you’re comfortable with that before you start chatting with notebooks in Gemini.
If you’re already using NotebookLM, your existing notebooks will appear in Gemini automatically. Test the integration, but be deliberate about which conversations you have in Gemini vs. NotebookLM.
If you’re advising clients on AI tools, update your guidance to reflect the split privacy model. NotebookLM chats and Gemini chats about the same notebook operate under different rules.
If you’re on a Workspace account, sit tight. This hasn’t rolled out to business accounts yet. Keep using NotebookLM directly, and watch for announcements about Workspace integration.
The Bottom Line
Google built something genuinely useful here. Connecting a grounded research tool with a general-purpose AI assistant, sharing context across both, syncing sources and instructions automatically. That’s the right architecture.
But the privacy story is messier than it should be. Two apps, one notebook, two different sets of rules for what happens to your conversations. For professionals handling sensitive information, that’s not a detail. That’s the whole ballgame.
I’ll be watching the Workspace rollout closely. That’s where this feature either becomes essential or stays a consumer curiosity.
If you read this far, you’re not someone who saw “Google update” and moved on. You’re the person at your firm who has to decide whether this is safe to use before everyone else starts using it on their own.
That’s the conversation I have every day with managing partners, GCs, and ops leaders who are trying to stay ahead of exactly this kind of problem. If you’re working through how to evaluate AI tools when the privacy story keeps shifting underneath you, send me a note at steve@intelligencebyintent.com. Tell me what you’re sorting out. I’ll tell you what I’m seeing and where I think the real risks are, straight.