NotebookLM

What it does

NotebookLM takes the PDFs, links and transcripts you upload and treats them as the whole world. Every answer carries a citation back to a passage in your own material, which makes it unusually hard for the model to quietly invent a number.

Useful for supplier dossiers, tender documents and long standards where the question is 'where does it say that'. The audio overview is a nice extra, not the reason to use it.

Standout features

• Answers grounded in uploaded sources
• Inline citations to the original passage
• Cross-document comparison and summaries
• Audio overview of a source set

Main job: turn a closed set of source documents into a searchable, cited question-and-answer workspace.

Best for

Use it when you need to answer questions from a fixed pile of contracts, specs or tender documents without losing track of which file said what.

Getting started

Create a notebook, upload the PDFs or paste the URLs, then ask questions in the chat pane and open the citation chips to check the source. Save the useful answers as notes before adding more files.

Watch out for

Watch out: it will not answer from outside the notebook, so a missing document looks like a confident 'not mentioned'. Check upload permissions first — customer drawings may be covered by an NDA.