Google expands NotebookLM with Deep Research and new file types

Google is rolling out a major upgrade to NotebookLM, introducing Deep Research and support for new file types to all users. This update positions the tool as a broader research engine capable of processing web sources and a wider range of user documents. The release is being deployed to accounts over the course of a week, with image uploads to follow later.

Deep Research functions as a long-running mode that builds a research plan, reviews large sets of online materials, and produces a structured report with cited sources. Users can monitor progress in the source panel and import results directly into their notebook. A faster, lightweight option is also available for shorter queries.

NotebookLM now accepts Google Sheets, Google Drive links, PDFs from Drive, and Word files. The system parses structured tables, multi-page documents, and linked repositories without requiring manual uploads. Drive URLs can be added in batches, enabling larger research collections to be assembled quickly.

These changes broaden the tool’s applicability for students, analysts, founders, and teams relying on mixed document formats. The expanded file support also aligns NotebookLM with workflows inside Google Workspace, where teams maintain data in Sheets and drafts in Docs before moving to NotebookLM for synthesis.

Google positions this upgrade as part of its effort to make NotebookLM a central hub for long-form research across personal and professional contexts, particularly for users who track large sets of sources and need consolidated analysis in one place.

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