NotebookLM

NotebookLM is Google's research notebook: you upload your own documents and it answers questions, writes summaries and builds study material grounded in those sources, with citations back to them.

It suits researchers, students, analysts and consultants who need to understand a set of documents quickly, and it can turn sources into formats such as audio overviews. A free version is available to most Google account holders.

Higher limits and extra features have been reported as part of Google's paid AI subscription, so check current availability for your account. Outputs still need checking against the original sources.