What's NotebookLM's word limit per source?
One sentence: each source can hold up to 500,000 words or 200MB, whichever limit hits first, and that ceiling is identical whether you're on the free plan or the most expensive one.
500,000 words or 200MB per source, whichever comes first. This limit is the same on every plan, free through Ultra; paying more raises how many sources you can add per notebook, not how big a single source can be. There is no page limit for PDFs specifically, only the word count and file size matter.
Why this number does not change with a paid plan
It surprises people that upgrading does not raise the per-source ceiling. What paid tiers actually increase is the number of sources per notebook (50 on free, up to 600 on the top Ultra tier) and your daily usage allowances for chat and generation. A single source's size cap is a fixed technical limit, not a monetized one.
What counts toward the limit
- Word count, roughly 500,000 words, applies to the extracted text content of a document regardless of format.
- File size, 200MB, is the harder wall for image-heavy PDFs, audio files and anything with a lot of non-text content padding out the file.
- PDFs have no separate page limit. A 400-page PDF is fine as long as its word count and file size stay under the caps.
What happens if a document is too big
NotebookLM will not ingest all of an oversized document; either the upload fails outright or the content gets processed incompletely, which is worse than a clean failure because you may not immediately notice the gap. The fix is splitting the document into two or more sources, or trimming it to only the sections you actually need before uploading.
If you're managing many large documents
The per-source generosity (500,000 words is a genuinely large budget, well beyond most single papers or reports) is exactly what makes source consolidation work as a strategy against the 50-source notebook cap. Merging several related, smaller documents into one file well under the per-source limit is often better than treating them as separate sources; the full technique is in beating the source limit, and general source preparation advice is in the sources guide.
People also ask
How many pages can a NotebookLM PDF be?
There is no separate page limit. A PDF can be any number of pages as long as its total word count stays under roughly 500,000 words and its file size stays under 200MB.
Does the word limit apply to YouTube video sources?
The same overall per-source cap applies, but in practice a video transcript rarely comes close to 500,000 words, so this limit almost never affects video sources.
What happens to text beyond the word limit?
NotebookLM either rejects the upload or processes it incompletely, meaning answers based on that source may silently miss content past the cutoff. Split the document instead of risking that gap.
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