NotebookLM Adds Deep Research (blog.google)

Google’s NotebookLM is adding “Deep Research” agents and wider file-type support to streamline complex research workflows. Deep Research can be launched from the web source panel in two modes—Fast Research for quick scans and Deep Research for full briefings—and it autonomously builds a research plan, browses and refines searches across hundreds of sites, then produces an organized, source-grounded report. You can import the report and its citations directly into your notebook, keep adding sources while the agent runs in the background, and immediately apply NotebookLM features like audio/video overviews to synthesize or transform findings. For AI/ML practitioners this speeds literature reviews, dataset discovery, and synthesis of heterogeneous inputs into a single, queryable knowledge base. NotebookLM also adds native support for Google Sheets (structured-data queries/summaries), Drive files via URLs, image uploads (including photos of handwritten notes), PDFs from Drive, and .docx — all rolling out to users over the next week, with images following in the coming weeks. Technically, the update emphasizes iterative, source-grounded retrieval and in-notebook integration, which reduces manual aggregation, improves traceability of sources, and makes it easier to extract tabular or unstructured content for downstream experiments or model documentation.