NotebookLM Gains Powerful New Source-Finding and File Support Features

Overview of the Upgrade

Google announced a substantial update to NotebookLM, its AI‑driven notetaking and research assistant built on the Gemini model. The enhancement focuses on simplifying how users discover and incorporate sources into their notebooks, a core functionality that underpins the platform’s utility. The announcement came on a Thursday, positioning the new capabilities alongside recent improvements to the mobile application and a more robust chat experience.

Enhanced Source Discovery

NotebookLM now provides a streamlined workflow for adding web‑based sources. Users can select “web” as a new source and then choose between two research styles: “Fast” research for quick searches and “Deep” research for comprehensive briefings. Fast research delivers rapid results, while Deep research generates an in‑depth analysis and a curated list of relevant sources, although it requires more processing time. Both modes present a briefing of findings and allow users to import a series of suggested sources directly into their notebooks.

Preferred Source Integration

The update introduces the ability to add CNET as a preferred Google source within Chrome, giving users quick access to a trusted technology news outlet when gathering material.

Expanded File Type Support

In response to user requests, NotebookLM now accepts a broader range of file formats as source material. Users can add Google Sheets and Microsoft Word documents (DOCX) directly to notebooks. Additionally, PDFs and other files stored in Google Drive can be incorporated via their URLs or by selecting them from Drive, eliminating the need to download and re‑upload files. This flexibility streamlines the workflow for students, researchers, and professionals who rely on diverse document types.

Implications for Users

While NotebookLM is marketed primarily toward school and study contexts, the new features expand its applicability to workplace and personal projects. By automating source discovery and supporting varied file formats, the platform reduces manual effort and enhances the quality of research outputs. The combination of Fast and Deep research modes offers users the choice between speed and depth, catering to different project timelines and objectives.

Future Outlook

The upgrade reinforces NotebookLM’s position as a competitive AI research assistant in a growing market of educational and productivity tools. Continued integration with Google services and the expansion of source handling capabilities suggest that Google will keep evolving the product to meet the needs of a broader user base.