Everything You Want to Know about Google NotebookLM
The Gemini Notebook fetcher (user-agent renamed from Google-NotebookLM to Google-GeminiNotebook in July 2026) requests individual URLs that Gemini Notebook users add as sources for their projects.
Last verified August 15, 2026 against Google's published crawler docs
Why it's crawling your site
A user added your URL as a source in Gemini Notebook (formerly NotebookLM); as a user-triggered fetcher it does not obey robots.txt.
How Google NotebookLM views your website
Google NotebookLM fetches raw page HTML (single-page fetch, user-triggered) — it does not execute JavaScript. Content that only appears after client-side rendering is invisible to it.
Paste a URL for the rendered-vs-crawled diff, blocked resources, and the sections that never reach the bot.
How to block Google NotebookLM
Add the rule below to your site's robots.txt. Most crawlers, including Google NotebookLM, check for changes within 24 hours.
User-agent: Google-GeminiNotebook (formerly Google-NotebookLM, legacy token supported through Aug 2026)
Disallow: /Need the full walkthrough?
Partial blocks, per-directory rules, Cloudflare and server-level options, verification.