NotebookLM (Gemini Notebook) for teachers: a class notebook

A class notebook is one notebook that holds one course: every recorded lecture, the syllabus, the reading list. Once it exists, everything NotebookLM generates — study guide, flashcards, quiz, Audio Overview — comes from the whole term rather than from whichever PDF was to hand.

NotebookLM is now Gemini Notebook — Google renamed it on July 16, 2026, same product (announcement). Google’s numbers below were checked against the linked pages on the date shown.

Step 1: the corpus

The recorded lectures. If they are on YouTube, NotebookLM takes public URLs and imports the caption text, nothing else. Google’s sources page (checked 2026-08-21): “Only public YouTube videos with captions … Only the text transcript of the video is imported.” A video uploaded under 72 hours ago may not import yet; one later deleted or made private is removed from notebooks within 30 days.

Google’s page says “public” and never mentions unlisted videos, so treat an unlisted lecture as unsupported until you have tried it: make it public, or upload the recording as an audio file instead.

The syllabus and handouts go in natively through NotebookLM’s own Add source: PDF, Docs, Slides (up to 100 slides), Sheets (100k tokens), Word, text, Markdown, CSV, PowerPoint, ePub, images and audio, per the same page. source-lm does not touch PDFs or Docs — NotebookLM takes them already. Drive sources “are auto-updated and will sync every few minutes”, so a syllabus in Docs stays current.

The web readings. Web URLs are accepted, but only the text of that one HTML page is scraped, and paywalled pages are unsupported.

Step 2: build it once

One notebook per course, not per lecture and not per week: the point is a question that can range over the term.

The wall is the source cap: 50 sources per notebook on the free tier, and each YouTube video is one source (plan table, checked 2026-08-21). A 12-week course with two lectures a week is 24 sources before a reading goes in — that fits. A 40-lecture course plus readings does not, and the options are the usual three: keep the newest N lectures, split across two notebooks (the free tier allows 100), or pay Google — Plus 100 sources per notebook, Pro 300.

The tedium is in the adding: Add source takes one link at a time. source-lm puts an Add to notebook button into YouTube’s own interface — channel header, playlist page, playlist panel — so one click adds the playlist, or the channel’s newest N videos (50 by default, you set the number). The walkthrough is add a YouTube channel or playlist; the reading list has a matching shortcut, the extension’s Link tab taking a list of URLs one per line. Product detail: the YouTube page; the student’s side of the same workflow: the students page.

Step 3: generate for the class, from the whole course

All of this is NotebookLM’s own Studio panel, generated only from the notebook’s sources (Google’s list, checked 2026-08-21):

• Reports — the study guide format, or FAQ, or briefing document.
• Flashcards and Quizzes — difficulty easy/medium/hard, quantity fewer/standard/more.
• Audio Overviews — a discussion between AI hosts, in the formats Deep Dive, The Brief, The Critique and The Debate, 80+ languages. A revision podcast for exam week.
• Mind Maps, Video Overviews, Slide Decks, Infographics, Data Tables.

Quotas matter more for a teacher: you generate for thirty people. Since September 2, 2026 there are no fixed per-day counts. Chat and every Studio output draw on one AI usage budget that refreshes every 5 hours up to a weekly limit, and Google says the features you use affect how much each request costs. Plus doubles the free budget, Pro quadruples it (usage limits, checked 2026-09-28). Google gives no per-output cost, so check the usage panel before a batch of thirty; if you hit the limit, “Generate later” on the web queues Studio outputs to run once it refreshes.

One setting worth flipping before students arrive: chat settings offer a conversational style, and “Learning Guide” is described by Google as “best for educational content, helping you grasp new concepts and skills efficiently” (chat page, checked 2026-09-10). Set once, it shapes every answer the class gets.

This is where building the corpus first pays: a study guide from a notebook of three lectures is a confident summary of three lectures. Chat answers cite the passage they came from, so a quiz question you doubt can be checked against the lectures with one question in chat.

Step 4: share it with the class

Share sits at the top of the notebook. Google’s notebook page (checked 2026-09-10) gives two roles by email address: a viewer “has read-only access to all the source documents and notes”, an editor “can view, add, or remove sources and notes … as well as share it further”. There is a plain link, a “Copy link to chat view” link that hides the sources for “a focused experience” (Google’s own caveat: it “does not completely revoke a viewer’s underlying access”), and a public setting for “anyone with a Google account”. Everyone has to be signed in. For a class, students are viewers: they chat against the course, they cannot change it.

Through Google Classroom the sharing is done for you. A teacher on a Workspace for Education account can create a notebook, or attach an existing one, to a Classroom post; it is shared with the class automatically, and an edit to the notebook “automatically applies to all classes” it is attached to. Students get read-only sources, “can use the chat functionality and interact with studio items” but “can’t generate studio items” — so the study guide and the quiz are yours to generate, theirs to use. Condition on the same page: “Your admin must enable access to Gemini Notebook” (Classroom help, checked 2026-09-10).

Two account facts decide which side you are on. In Workspace for Education, Gemini Notebook is “included in all Google Workspace for Education editions free of charge”, “Available to users of all ages” (admin quickstart, checked 2026-08-21). On a personal account the free tier is “available in browser to all users above the age of consent” (overview, checked 2026-08-21) — which is why a class notebook for school-age students belongs on school accounts.

Admins hold the switch: Classroom’s “your admin must enable access” above, and the Workspace privacy hub’s per-organisational-unit control. The same hub answers what teachers get asked: for Workspace and Education accounts, uploads, queries and responses “will not be reviewed by human reviewers, and will not otherwise be used to train generative AI models” (privacy hub, checked 2026-08-21). Consumer wording: is NotebookLM private.

Step 5: next term, only the new lectures

Re-running the channel or playlist button on the same notebook adds only what is not there: source-lm reads the notebook’s existing source URLs first and skips any video already present, reporting them in the toast as skipped N. That is a skip, not a sync: nothing is removed or updated to match YouTube, and a lecture re-recorded under a new URL arrives as a second source.

When a course ends, the extension adds a delete control to the Sources panel that removes every checked source at once, plus a Select duplicate sources helper. Deleting sources is free and unmetered.

What it is not

Not an LMS. No roster, no submissions, no gradebook. A Quiz in Studio is an interactive study aid the student runs in their own browser; nothing comes back to you, so it is not an assessment you collect. And it answers only from the notebook’s sources, so a question whose answer was never in a lecture gets no answer.

FAQ

Is NotebookLM free for educators?

In Google Workspace for Education, yes — the quote and link are in Step 4 — once the admin has enabled it. The tier depends on the edition: Education Fundamentals and Standard sit on the Standard tier, while Education Plus, the Teaching and Learning add-on and Google AI Pro for Education raise it (Workspace tiers, checked 2026-08-21). A personal account has a free tier too — 100 notebooks, 50 sources each.

What can NotebookLM do for teachers?

Answer questions about your course material with a citation back to the lecture or page it came from, and generate a study guide, FAQ, briefing, Flashcards, a Quiz, a Mind Map, an Audio or Video Overview from one notebook’s sources. That is the list, and it covers the two jobs that eat evenings: revision material, and “where did we cover this”.

Which free AI is best for teachers?

Narrow answer, since we sell an extension for one product: NotebookLM is good at one thing — being grounded in a corpus you chose, with citations. For anything not grounded in your own material it is the wrong tool (NotebookLM vs the Gemini app).

Limits

Every Google figure was copied from the linked page on the date shown, and these caps have changed before. The ceiling that bites is 50 sources per notebook, not the 500,000 words per source (NotebookLM limits). On the extension’s free tier, a click adding more than one video or link is one bulk action, 5 a calendar month; single videos, links and deletions are free. Unlimited is $29, once.

Not affiliated with Google. NotebookLM and Gemini are Google trademarks; this is an independent extension that automates a signed-in session.