# What is the NotebookLM source limit?

Source: https://nlmexporter.com/guides/questions/what-is-the-notebooklm-source-limit  
Section: Questions  
Last verified: November 2026

Google documents a limit of 50 sources per notebook on the free tier, with each source limited to 500,000 words or 200 MB. Paid Google plans raise the number of sources per notebook. The limits are set by Google; no extension can raise them.

## What to know

- Every web page, file, video and pasted text counts as one source.
- Daily limits on chat and on Audio and Video Overviews also depend on your Google plan.
- Google changes these numbers; its help page for NotebookLM is the authority.

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

## Frequently asked questions

### What happens when I reach the limit?

NotebookLM refuses new sources for that notebook. Remove sources, merge several into one, or start another notebook.

### Does Ultra Exporter Pro raise the limit?

No. Pro removes the extension import quota only. Google limits still apply.

## Related guides

- [How do I work around the NotebookLM source limit?](https://nlmexporter.com/guides/questions/how-to-get-around-the-notebooklm-source-limit)
- [Merge NotebookLM sources into one to free source slots](https://nlmexporter.com/guides/import/merge-sources-to-notebooklm)
- [How do I add multiple URLs to NotebookLM at once?](https://nlmexporter.com/guides/questions/how-to-add-multiple-urls-to-notebooklm)
- [How do I add a YouTube playlist to NotebookLM?](https://nlmexporter.com/guides/questions/how-to-add-a-youtube-playlist-to-notebooklm)
- [Why can NotebookLM not import my website link?](https://nlmexporter.com/guides/questions/why-cant-notebooklm-import-my-website)
- [How do I add a ChatGPT conversation to NotebookLM?](https://nlmexporter.com/guides/questions/how-to-add-a-chatgpt-conversation-to-notebooklm)