NotebookLM gets Deep Research and finally supports Word and Sheets

Until now, the most tedious part of using NotebookLM was playing research assistant to your own notebook. You had to Google the papers, download the PDFs, and drag them into the app yourself before the AI could do anything useful.

Google rolled out a major upgrade that flips that workflow on its head: an autonomous Deep Research agent and long-awaited support for standard work formats like Word docs and spreadsheets.

A personal researcher that runs in the background

Deep Research essentially gives you a tireless research assistant inside NotebookLM. Instead of waiting for you to feed it documents, you can now head over to the source panel, select Web, and choose your research style.

If you just need quick links, Fast Research rapidly scans the web so you can import sources on the fly. But Deep Research is where things get interesting. It takes your prompt, maps out a research plan, browses hundreds of web pages in the background, and sharpens its search queries as it learns.

After a few minutes, you get an organized, source-grounded briefing. What makes this different from ordinary AI search is that the generated report does not just sit in a chat box. You can instantly add the whole report and its underlying web sources straight into your notebook, and then turn them into Audio or Video overviews.

Finally, spreadsheets and Word docs make the cut

Alongside web agents, Google is fixing NotebookLM's annoying file limitations. Real work lives in spreadsheets and drafts, not just clean PDFs.

You can now upload Microsoft Word (.docx) files and Google Sheets directly, allowing the AI to summarize spreadsheets and pull key statistics without third-party converters. Adding files from Google Drive is also much smoother: instead of downloading and re-uploading, you can just paste Drive URLs directly into the source bar, separated by commas.

Google also announced image support for handwritten notes and brochures, which will roll out over the next few weeks, while the other features arrive over the coming week.

Since its debut in late 2023, NotebookLM has steadily evolved from an experimental lab demo into a core productivity suite. Earlier this year it added Video Overviews on top of its viral Audio podcast generator, and in May it launched native mobile apps on Android and iOS.

Why it matters

We think this update turns NotebookLM from a smart document reader into a full-cycle research engine.

For analysts, students, and writers, this saves hours of grunt work. Most AI search tools stop at giving you an answer; NotebookLM treats the web search as merely the starting ingredient for your ongoing project. Gathering, synthesizing, and turning dense information into audio briefs all happen in a single, continuous workflow.

It also poses a serious threat to standalone AI research and note-taking apps. By integrating multi-step autonomous browsing with Drive, Word, and Sheets, Google is eliminating the friction that kept users switching between tabs.

One caveat worth keeping in mind: autonomous web synthesizers can still misinterpret nuance or rely on SEO-heavy sources, so checking the linked citations remains essential. But as far as free research upgrades go, this is easily one of the most practical tools Google has shipped this year.