Chrome extension · NotebookLM & Gemini Notebook
A NotebookLM Chrome extension for adding sources in bulk
source-lm is a third-party Chrome and Edge extension that adds sources to NotebookLM (Gemini Notebook) in bulk: a YouTube playlist or channel, a Telegram or Discord chat export or any JSON dataset split into sources, a Notion page with its subpages, ChatGPT, Claude, Gemini and Perplexity conversations as transcripts, and web pages or whole link lists. Single sources and 5 bulk actions a month are free; $29 once unlocks unlimited bulk actions, with no subscription. It runs inside the NotebookLM session you are already signed into — no account of ours, no server of ours.
Google publishes no extension of its own, and NotebookLM takes one source at a time: paste, wait, paste again.
Also on Edge Add-ons. $29 once for unlimited bulk actions — no subscription. Source-available and shipped unminified — read the code.
Three inputs, one click each
01
YouTube, from YouTube
“Add to notebook” buttons on the watch page, the playlist panel, the playlist page and the channel header. A playlist goes in with one click, each video its own source; on a channel you set how many of the newest videos to take, 50 by default. The four buttons.
02
A JSON export, split into sources
A Telegram chat export, a ticket dump, any array of records: the popup splits it into Markdown files packed to a word budget under NotebookLM's per-source limit, shows the exact files first, and re-running later uploads only what is new. The Telegram walkthrough.
03
Pages, links and selections
The active tab, a pasted link, or a list of links, one per line; selected text on any page from the right-click menu. A Notion page goes in from a button in Notion’s own top bar, with one level of its subpages if you want them. Nothing is written to disk — the files are built in memory and pushed into the open notebook. Notion, page and subpages.
source-lm vs other NotebookLM extensions
The five extensions named most often next to source-lm, read off each product's own site or store listing on 2026-09-29 (ExtendLM's inputs on 2026-08-21). Prices change; check the linked page before paying. "—" means the product does not publish it. None of them, source-lm included, lifts NotebookLM's own cap of 50 sources per notebook on the free plan, 100 on Plus, 300 on Pro and 500 or 600 on Ultra, or 500,000 words per source — see NotebookLM limits per plan.
| Extension | Source types | Bulk | Price model |
|---|---|---|---|
| source-lm | YouTube video, playlist, channel (latest N); Telegram, Discord (DiscordChatExporter) or any JSON export, split into Markdown files; Notion page + subpages; ChatGPT, Claude, Gemini, Perplexity transcripts; page, link list, selection | Playlists, channels, JSON exports, link lists; 5 bulk actions a month free | Free (single sources unmetered) · $29 once |
| NotebookLM Web Importer | Page, link lists, all links on a page, open tabs, YouTube videos and playlists, RSS, podcast feed sync | Premium only; free tier is 20 page imports a day | Free · $19/yr · $39 once |
| NotebookLM Tools | URL lists, playlists, RSS or sitemap, open tabs, Drive, files; exports sources to JSON or Markdown | Yes, on the free tier — every feature is free | Free · $7 for 30 days · $29/yr · $59 once, all one-time |
| YouTube to NotebookLM | YouTube videos from playlists, channels and upload pages | Limited imports a month free; unlimited on paid plans | Free · $4.99/mo · $19.99/yr · $29.99 once |
| ExtendLM | Page (incl. PDF), YouTube channels and playlists, tab audio, AI chats, Reddit and X, PubMed and arXiv papers | Channels and playlists | Listing calls it free; paid tiers — |
| Kortex | ChatGPT, Claude, Gemini, Perplexity and other chats; X, Reddit, LinkedIn, YouTube; Google Docs; pages; CSV, RSS, tab crawler; exports to PDF, Markdown, ZIP | Free tier 10 imports a day; unlimited on Pro | Free · $9.99/mo · $59/yr · $129 per 3 years; own cloud |
When to pick something else
- Pages, open tabs and RSS feeds, cheaply: NotebookLM Web Importer at $19 a year — the most-installed extension in this category, with inputs we do not have.
- Everything free, plus export and folders: NotebookLM Tools. Bulk import is on its free tier; source-lm meters bulk at 5 a month.
- Chat archiving across many AI sites, sync between devices and exports: Kortex — a cloud service on a subscription, with no lifetime plan.
- Papers from PubMed and arXiv, or tab audio: ExtendLM.
- Only YouTube, paid monthly or yearly: YouTube to NotebookLM.
Pick source-lm for volume from one place — a playlist, a channel, a chat export split under the per-source word cap, re-runs that add only what is new — with no account and no cloud in the loop. It has no RSS, no open-tabs import, no PDF upload, no folders and no export out of a notebook. The full roundup, sorted by job: Best NotebookLM Chrome extensions in 2026.
Start here
What the extension does, and what NotebookLM itself does — grouped by the job you came for.
The extension
- YouTube to NotebookLM in bulk
Every button the extension adds inside YouTube, what NotebookLM keeps from a video, and what counts as one bulk action.
- Telegram export to NotebookLM
JSON from Telegram Desktop or HTML from the macOS app, split into Markdown sources with a cursor so a later export adds only new messages.
- Notion page and subpages to NotebookLM
The button in Notion’s top bar, what it does on your own workspace versus a public notion.site, and how far down the page tree it reaches.
- NotebookLM for studying
The lecture playlist in one notebook, what the source cap means for a 60-lecture course, and questions worth asking a course notebook.
Guides
- NotebookLM MCP + Claude Code: setup and feeding it sources
Set up the NotebookLM (Gemini Notebook) MCP server in Claude Code in three commands, then fill its notebooks from YouTube, Notion and Telegram.
- NotebookLM Web Importer: what it does and what it costs
A checked look at the NotebookLM Web Importer extension — who makes it, its free tier and $19/yr price, what it imports, and where it stops.
- How to use NotebookLM (Gemini Notebook): sources-first guide
How to use NotebookLM (Gemini Notebook): what counts as a source, the ways material gets in, the limits that bite, what to ask, what Studio makes.
- NotebookLM vs Gemini Notebook: same product, renamed in 2026
Gemini Notebook is NotebookLM renamed on July 16, 2026. What changed, what did not, and how it differs from the Gemini chat app — with Google's pages linked.
- Best NotebookLM Chrome extensions in 2026
Google makes no NotebookLM extension. A checked list of third-party Chrome extensions that import, export and organise Gemini Notebook sources, with prices.
- Is NotebookLM private? What Google actually says
What Google states about training, human review, retention and HIPAA for NotebookLM, dated and linked — and what a browser extension adds to that surface.
- NotebookLM limits in 2026: sources, words, size
NotebookLM limits per plan: notebooks, sources per notebook, 500,000 words or 200 MB per source, the 5-hour usage budget with its weekly cap, and Enterprise.
Getting sources in
- How to save a ChatGPT conversation to NotebookLM
Save a ChatGPT conversation to NotebookLM (Gemini Notebook) in one click, as a labelled Markdown transcript. The same for Claude, Gemini and Perplexity.
- How to import Notion pages into NotebookLM, with subpages
NotebookLM has no Notion connector, and a pasted Notion link imports empty. Two ways that work: Notion's own Markdown export, or one click with source-lm.
- Turn a Telegram channel into a NotebookLM knowledge base
Export a Telegram channel in Telegram Desktop and load the archive into NotebookLM as sources — a knowledge base you can question, private channels included.
- Export a Telegram chat to NotebookLM: JSON or HTML
Export Telegram chat history on a Mac (macOS app 12.10+) or in Telegram Desktop — JSON or HTML — and load it all into NotebookLM (Gemini Notebook).
- Add a YouTube channel or playlist to NotebookLM
Add a whole YouTube channel or playlist to NotebookLM in one click — what NotebookLM keeps from a video, a real run, and the limits.
Research & study
- NotebookLM (Gemini Notebook) for teachers: a class notebook
One NotebookLM (Gemini Notebook) notebook per course: lectures, syllabus and readings in, study guide and quiz out of the whole term, re-run next year.
- NotebookLM (Gemini Notebook) use cases for many sources
Seven NotebookLM use cases where the corpus is many items: a lecture playlist, a years-long chat, 200 papers, a ticket export — and how each gets in.
- NotebookLM for a literature review: 200 papers
Export Zotero as CSL JSON, push 200 titles and abstracts into NotebookLM as a handful of sources with source-lm, then add only the PDFs you actually read.
01What is the best NotebookLM Chrome extension in 2026?
It depends on the input. For single pages, tabs and RSS, NotebookLM Web Importer or the free tier of NotebookLM Tools; for export and folders, NotebookLM Tools or Kortex; for a whole YouTube channel, a Telegram, Discord or JSON export, a Notion page tree or AI chat transcripts in bulk with no account and no cloud, source-lm — 5 bulk actions a month free, $29 once for unlimited. The full roundup, with prices.
02What is a good Kortex alternative for bulk import into NotebookLM?
If what you need is volume into a notebook rather than a chat archive, source-lm: a YouTube channel or playlist in one click, a chat export split into sources, $29 once instead of $59 a year, and no backend holding your data. Kortex still wins on breadth — more chat sites, CSV and RSS import, exports, and sync across devices.
03Is there an alternative to NotebookLM Web Importer that imports in bulk for free?
Web Importer's free tier is 20 page imports a day; playlists, tabs and RSS need Premium at $19 a year or $39 once. NotebookLM Tools puts bulk import on its free tier. source-lm gives 5 bulk actions a month free and adds what Web Importer does not advertise: JSON and Telegram exports and whole YouTube channels. Web Importer, checked.
04How do I add more than 50 sources to NotebookLM?
Not in one notebook on the free plan: NotebookLM caps it at 50 sources, 100 on Plus, 300 on Pro and 500 or 600 on Ultra, and no extension lifts that. What an extension changes is how many clicks it takes to fill the cap, and how much fits in each source — a JSON export packed into files of up to 400,000 words each, under the 500,000-word per-source limit. NotebookLM limits per plan.
05Does it still work now that NotebookLM is Gemini Notebook?
Yes. Google renamed NotebookLM to Gemini Notebook on July 16, 2026 — same product, same notebooks, new name. The extension works in it, and both names appear on this site because both are still in use. Google's announcement.
06What is free, and what costs money?
Single sources — one page, one link, one video, one selection — are free and unmetered, and so is deleting sources. Bulk actions, meaning one click that adds more than one source, are capped at 5 a calendar month on the free tier and reset on the 1st. $29 once lifts the cap for good; there is no subscription.
07Where do the requests go?
To the notebook's own Google origin, the upload host it hands back, and the payment provider's public licence endpoint — nothing else. There is no author-controlled server, no proxy, no analytics. Settings, the licence key and the free-tier counter live in chrome.storage.sync. What Google says about privacy.
08Does it need an account?
No. There is no sign-up and no sign-in: the extension works inside the Google session you are already signed into, and a paid licence is a key you paste into the popup. Open NotebookLM once after installing so the notebook list is cached — a YouTube page cannot reach the notebook on its own.
09Does it work in Microsoft Edge?
Yes — it is published on Edge Add-ons as well as the Chrome Web Store, and the same build runs in any Chromium browser that takes Manifest V3 extensions. The Edge listing.
One click per archive, not one per source.
Install source-lm5 bulk actions a month, free. Single sources always free.