Why does NotebookLM start prompting too many sources and too large content even though it hasn't stuffed much information yet? This is not an illusion, Google has set a clear upper limit for NotebookLM. In Add or discover new sources for your notebook and Upgrade NotebookLM , Google states that the regular version of a notebook has a maximum of 50 sources, and each source has a size boundary, and the common caliber is a maximum of 500,000 words. and affected by file size limitations.
Why do many people hit the wall so quickly?
Because NotebookLM's source is not just a PDF. Web pages, Google Docs, YouTube links, and copied text are all considered sources. You think it's just "adding a little information", but if there are web pages, documents, and videos in a topic, 50 sources are actually consumed quickly. In addition, some documents are large, and although the number of sources is not exceeded, a single source may also touch the word number or file size limit first.
More stable usage
- Don't stack all the information into a notebook, it's more stable to split it by topic.
- Prioritize retaining sources that will be cited repeatedly, and do not stuff all the "potentially useful" sources.
- Split large and miscellaneous documents first, or organize them into more focused data before importing.
So NotebookLM prompts the source limit, usually not because it suddenly bugs, but because you are already using it as an "infinite repository". It is more suitable for making a thematic knowledge book rather than pouring the entire database into it at once.
