5 Best Chrome Extensions for NotebookLM in 2026

TL;DR The best Chrome extension for NotebookLM depends on your workflow. For AI power users who save Claude, ChatGPT, or Perplexity conversations: Kaptex (Best Overall). For simple URL and YouTube capture: NotebookLM Web Importer (200,000+ installs). For full platform features and teams: Kortex. For interface organisation: NLM Tools. For free YouTube-only capture: YouTube to NotebookLM.

You find valuable things constantly while browsing — AI conversations, Reddit threads, articles, YouTube videos. The problem isn't finding them. It's getting them into NotebookLM before the next tab opens and the moment is gone.

Most resources end up in one of two places: an open tab you'll close without reading, or Apple Notes where they quietly disappear. I've tested every extension in this category firsthand — while building my own. Here's what each one actually does, where it stops, and which type of user gets the most from it.

Best NotebookLM Chrome Extensions: Quick Comparison (2026)

• Kaptex — Best Overall — the only extension that captures AI conversation text, Reddit threads, files, and browser tabs
• NotebookLM Web Importer — Best for URL and YouTube capture (200,000+ installs)
• Kortex for NotebookLM — Best for full knowledge workflow and teams
• NLM Tools — Best for organising inside NotebookLM
• YouTube to NotebookLM — Best free single-purpose option

1. Kaptex — Best Overall NotebookLM Extension (2026)

I built Kaptex because I had this exact problem. I use NotebookLM every day — for product research, synthesising long YouTube rabbit holes, and making sense of Reddit threads before writing anything. Every session started the same way: stop what I'm doing, open a new tab, navigate to NotebookLM, find the right notebook, paste the source. Repeat. When I realised none of the existing extensions captured what I actually needed — AI conversations — I built it myself.

Disclosure: I'm the founder of Kaptex. I've tested every competitor firsthand while building this. Judge the specifics yourself.

Kaptex is a Chrome extension that adds a one-click "Save to NotebookLM" button on Claude, ChatGPT, Perplexity, YouTube, and Reddit — letting you capture sources without leaving your current tab. When you click it on an AI chat, it extracts the full conversation text (not a URL that would expire) and sends it directly to your selected notebook.

The persistent side panel is the key differentiator. Unlike popup extensions that close every time you navigate, Kaptex's panel stays open as you move between tabs. Your selected notebook travels with you.

What it does

• One-click capture on Claude, ChatGPT, Perplexity, YouTube, and Reddit
• Saves full AI conversation text — not URLs that expire and can't be fetched
• Reddit thread capture: structured post + top comments as Markdown
• File uploads: .txt, .md, .csv, .html, .json
• Bulk URL import — paste multiple URLs at once
• Tab sweep: import all open browser tabs into a notebook in one click
• Persistent side panel with notebook browsing and creation

Why it's our top pick: Most people searching for a NotebookLM extension in 2026 already use Claude, ChatGPT, or Perplexity. That's exactly the workflow gap Kaptex fills that no other extension touches. It also has the lowest price in the category for its feature set — $49 lifetime vs $99 for the next closest competitor. The persistent side panel alone — staying open as you move between tabs — makes everything else feel like a workaround.

Pricing

• Free: 10 saves/day per source type
• Pro: $3/month ($36/year)
• Lifetime: $49 one-time

Who it's for

Researchers, students, and knowledge workers who use Claude, ChatGPT, or Perplexity daily alongside NotebookLM. Also power users who batch-import URLs, sweep open tabs at the end of a research session, or save Reddit threads as structured sources. If you use NotebookLM for serious research and want to stop losing insights to open tabs, this is your tool.

What's on the roadmap

A few things are still being built: YouTube playlist import, RSS/podcast feed support, and Firefox and Edge support are all planned. Kaptex is Chrome-only today. Team and enterprise plans are not on the near-term roadmap — it's built for individual researchers and knowledge workers.

-> Install Kaptex free — 30 seconds, no credit card required.

2. NotebookLM Web Importer

NotebookLM Web Importer is a well known tool among NotebookLM users. For simple use cases — articles and YouTube videos — it earns that position. It's reliable, well-tested, and does what it says on the label.

What it does

• One-click web page import
• YouTube video and playlist bulk import
• Bulk URL paste
• RSS feed and podcast sync
• Audio file downloads

Pricing

Freemium — pricing not publicly listed on their website.

Who it's for

Users whose sources are mostly articles and YouTube videos. The 200K install base means it's been stress-tested across many workflows. If you need YouTube playlist import or RSS feed syncing right now — features Kaptex has on its roadmap — this is the better short-term choice for those specific needs.

What it lacks

No capture from AI sites (Claude, ChatGPT, Perplexity). No Reddit thread formatting. No file uploads. No tab sweep. If your research workflow involves AI tools alongside NotebookLM, this extension stops short of what you need.

3. Kortex for NotebookLM

Kortex is the most feature-complete option in the category. It's not just a capture tool — it's a knowledge workbench built on top of NotebookLM, with source annotation, automation pipelines, and team collaboration.

What it does

• Source annotation, highlighting, and editing within the workbench
• Automation pipelines with custom triggers and actions
• Cross-project search and global context
• Nested folders, tags, and reusable prompt library
• Google Drive sync, CSV import, RSS feeds
• Teams (3+ seats) and Enterprise plans

Pricing

• Free: 5 daily imports (heavily restricted)
• Pro: $3.75/month ($45/year)
• Lifetime: $99 one-time
• Teams: $12/seat/month

Who it's for

Power users who need annotation, automation, LinkedIn or Twitter capture, or shared team workflows on top of NotebookLM. If you need the full platform experience and the price isn't a blocker, Kortex delivers it.

What it lacks

Price is the main friction point — Pro is $45/year vs Kaptex's $36, and Lifetime is $99 vs $49. The free tier is also more restrictive (5 daily imports vs 10). The feature density can overwhelm users who just want fast, frictionless capture without managing a platform.

4. NLM Tools

NLM Tools solves a different problem than every other extension on this list. It doesn't capture content from external sites — it enhances the NotebookLM interface itself. Think of it as the UI layer that adds what Google never shipped.

What it does

• Source folders (up to 50 per notebook)
• Saved AI prompts with slash commands
• Cross-notebook search
• Studio generation: quizzes, flashcards, slides, mind maps from notebook content
• Dark mode
• 80+ output language support
• Local data storage — nothing leaves your device

Pricing

• Free: all core features
• Pro: $29/year or $59 lifetime

Who it's for

Users who already have their sources sorted but want better organisation and generation inside NotebookLM. Students generating quizzes and flashcards from lecture materials. Privacy-conscious users (all data stored locally, no cloud sync). Notable: multi-browser support — Chrome, Firefox, Edge, Brave, Arc, and Opera.

What it lacks

It's not a capture tool. If you want to pull content from Claude, Reddit, or a tab stack into NotebookLM faster — NLM Tools doesn't do that. Use it alongside a capture extension, not instead of one.

NLM Tools and Kaptex are complementary, not competing. NLM Tools organises what Kaptex captures.

5. YouTube to NotebookLM

The simplest option on the list: one feature, one use case, free. If you only need to save YouTube videos to NotebookLM and nothing else, this handles it with zero overhead and no account required.

What it does

• YouTube video capture to NotebookLM

Pricing

Free.

What it lacks

Everything else. URLs, Reddit, AI conversations, file uploads, tab sweep, notebook management. Single-purpose by design — and that's the point.

Which NotebookLM Chrome Extension Is Best for You?

For most people reading this: Kaptex.

If you use NotebookLM, you probably already use at least one AI tool — Claude, ChatGPT, Perplexity. Kaptex is the only extension that captures those conversations, covers Reddit threads, handles file uploads, and lets you sweep all open tabs into a notebook at once. It costs less than every full-featured alternative. That combination covers the full research workflow for the majority of NotebookLM users today.

The exceptions — when to choose something else

• You need YouTube playlist import or RSS feeds right now -> NotebookLM Web Importer (Kaptex has both on the roadmap)
• You want better organisation, flashcard generation, or dark mode inside NotebookLM -> NLM Tools (use alongside Kaptex — they don't overlap)
• You only ever save YouTube videos and want it completely free -> YouTube to NotebookLM

Most power users end up running two extensions: Kaptex for capture, NLM Tools for interface organisation. They solve different problems and don't interfere with each other.

Can You Save ChatGPT or Claude Conversations to NotebookLM?

Yes — but only with Kaptex. This is the workflow gap that every other extension misses: you're mid-conversation with Claude or ChatGPT, you've just worked through something valuable — a research synthesis, a framework, a competitive breakdown — and you want to save it to NotebookLM before you lose the thread.

The conversation lives only in that tab. If you navigate away, it's effectively gone. If you try to paste the URL into NotebookLM, it won't work — AI chat URLs are private, session-bound, and can't be fetched by any external service.

Kaptex solves this by extracting the full conversation text directly from the page and sending it as a raw text source. NotebookLM processes it correctly. No other extension on this list does this — Web Importer, Kortex, NLM Tools, and YouTube to NotebookLM all treat sources as URLs or uploaded files, not extracted conversation content.

Frequently Asked Questions

Is there a free Chrome extension for NotebookLM?

Yes. Kaptex has a free tier with 10 saves/day per source type — no credit card required. NLM Tools is free for all core features. YouTube to NotebookLM is entirely free. NotebookLM Web Importer is freemium with undisclosed pricing.

What is the best NotebookLM extension for saving YouTube videos?

Kaptex is the best choice for YouTube video import.

What is the difference between Kaptex and Kortex for NotebookLM?

Kortex is a full knowledge platform with source annotation, automation pipelines, and team plans — Pro is $45/year ($99 lifetime). Kaptex is a focused capture tool — Pro is $36/year ($49 lifetime). Kaptex is built for individuals who want fast, frictionless capture. Kortex is built for teams and users who need annotation, automation, or LinkedIn/Twitter capture.

Can NotebookLM extensions see my browsing history?

Kaptex only reads content on sites where you explicitly click the capture button — no background scraping, no browsing history. Only notebook metadata and daily usage counts are stored. Privacy policy at kaptex.io/privacy-policy.

Conclusion

The NotebookLM extension category is still early. "Notebooklm chrome extension" search volume grew 700% year-over-year as of early 2026 — the user base is scaling faster than the tools built for it.

Each extension on this list solves a real problem. Web Importer is the safe default if your sources are URLs and YouTube. Kortex is the right call for teams and automation. NLM Tools adds what Google never shipped inside the interface. And Kaptex fills the gap that matters most for AI-first researchers: capturing Claude and ChatGPT conversations into NotebookLM without switching tabs.

Kaptex is free to install from the Chrome Web Store — 10 saves/day on the free plan, no credit card, no account setup required. If you use Claude, ChatGPT, or Perplexity alongside NotebookLM, you'll save your first conversation in under a minute.

The Pro plan is $3/month ($36/year) or $49 lifetime — the lowest price in the category for the feature set it covers.