NotebookLM source limits: 50 per notebook, 500 thousand words per source, and how to work around them

Symptoms

• The add source button goes inactive after 50 files
• A large PDF is rejected
• You cannot ask any more questions today

Causes and fixes

1. The free plan allows up to 50 sources per notebook and up to 100 notebooks

What to do: Merge small documents into one PDF per topic or split materials across several notebooks; Google AI Pro gives five times more

2. A source exceeds 500 thousand words or 200 MB

What to do: Split the document into volumes by section

3. The daily question limit on the free plan

What to do: Ask questions with a list of sub-questions in one request or move to Google AI Pro

4. A shared notebook with many sources answers slowly

What to do: Keep only current documents in the notebook and delete old versions

Common problems and fixes

• NotebookLM not working: four causes and what to do
• NotebookLM will not read a PDF or retells it with errors: scans, tables and protection

About NotebookLM

Answers only from your own documents, with citations to the exact paragraph and nothing invented from the web. Paid plans from $14/mo. Free plan available.

NotebookLM · Alternatives to NotebookLM