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QUESTIONS · SOURCES AND LIMITS

What file types does NotebookLM support as sources?

Verified · NotebookLM / Gemini Notebook·Markdown

Short answer

NotebookLM accepts PDF, text and Markdown files, Word documents, Google Docs and Slides, web page links, YouTube links, audio files, images and pasted text. Google adds formats over time, so its help page has the current list. Formats it does not take, such as EPUB, need converting first.

What to know

  • Scanned PDFs work only if the text can be recognised.
  • Each source has a size limit of 500,000 words or 200 MB.
  • NotebookLM Ultra Exporter Pro converts an EPUB into one text source per chapter and splits oversized PDFs.

Google changes these menus often. The item's own menu in your notebook shows what is built in today.

Frequently asked questions

Can I upload a folder?

Not in NotebookLM itself. The extension import center accepts a whole folder and sends Markdown and text files as text sources and other files through the official upload.

Related guides

Bulk upload files and folders to NotebookLM

To add many files at once, drop them, or a whole folder, into the NotebookLM Ultra Exporter import center.

Import an EPUB book into NotebookLM by chapter

To study a book in NotebookLM, use the book import in NotebookLM Ultra Exporter Pro. It parses the EPUB, previews it by chapter, and imports each selected.

Split a large PDF into parts for NotebookLM

When a PDF is too large for one NotebookLM source, the book import in NotebookLM Ultra Exporter Pro splits it into smaller PDFs that keep their layout, by.

How do I upload a PDF that is too large for NotebookLM?

A PDF over 200 MB or 500,000 words is rejected by NotebookLM. Split it into parts and upload each part as its own source.

Can NotebookLM update sources automatically?

Mostly no. A web or file source is a copy taken when you added it; only Google Docs and Slides sources can be re-synced by hand.

What is the NotebookLM source limit?

Google documents a limit of 50 sources per notebook on the free tier, with each source limited to 500,000 words or 200 MB.

How do I work around the NotebookLM source limit?

You cannot raise the limit, but you can fit more into it. Merge related sources into one text source, combine small text files before importing, and split.

How do I add multiple URLs to NotebookLM at once?

NotebookLM accepts website links through its add-source dialog, a few at a time. To import a long list, paste the URLs, one per line or mixed into text, into.