Help Center

What is Kaptex?

Kaptex is a Chrome extension that lets you save content to NotebookLM from any tab in one click.

How do I install Kaptex?

Install the Chrome extension from the Chrome Web Store in seconds — no account required to get started.

Which sites does Kaptex support?

Kaptex works on Claude, ChatGPT, Perplexity, YouTube, Reddit, and any URL — plus file uploads.

Can I save my Claude, ChatGPT, or Perplexity conversations to NotebookLM?

Yes. Kaptex injects a one-click button on Claude, ChatGPT, and Perplexity that captures the full conversation as a text source — not a URL.

Can Kaptex save Reddit threads to NotebookLM?

Yes — and Kaptex formats the post and top comments into clean Markdown so NotebookLM actually processes it correctly, unlike saving the URL directly.

Can I add multiple URLs to NotebookLM at once?

Yes. Paste a list of URLs one per line and Kaptex adds them all in sequence. Or sweep all open browser tabs into a notebook at once.

Is Kaptex safe? What data does it access?

Kaptex only reads content when you explicitly click the capture button. No background scraping, no browsing history collected.

Why does Chrome say the extension is "not trusted by Enhanced Safe Browsing"?

Kaptex is safe. This warning appears automatically for newly published extensions that haven't yet built up a user history in Chrome's system.

How is Kaptex different from NotebookLM Web Importer?

Web Importer handles URLs and YouTube well. Kaptex adds one-click capture on Claude, ChatGPT, and Perplexity, structured Reddit threads, file uploads, and browser tab sweep.

Will Google just add these features to NotebookLM natively?

Maybe, over time. But some of what Kaptex does — like capturing private Claude and ChatGPT conversations — Google can't build natively. And the friction you're experiencing today is real.

Can I use NotebookLM for YouTube videos?

Yes. Paste any public YouTube URL with captions as a source and NotebookLM extracts the transcript so you can query, summarize, and cite the video.

How does NotebookLM YouTube video summary work?

Add a YouTube URL as a source, then ask NotebookLM to summarize it. Every summary is grounded in the transcript and includes citations.

Can NotebookLM analyze videos?

Yes, but only YouTube videos with existing captions. NotebookLM reads transcripts, not raw video or audio files.

Can NotebookLM transcribe video?

No. NotebookLM uses existing transcripts — it does not generate transcriptions itself. Transcribe externally, then upload the result as a source.

Can you upload mp4 videos to NotebookLM?

No. NotebookLM does not support MP4 or other video file formats. Use a YouTube URL instead, or transcribe the video externally and upload the transcript.

How to add YouTube video to NotebookLM

Open your notebook, click "Add Source," paste the YouTube URL, and click Insert. NotebookLM fetches the transcript automatically.

How do I fix the NotebookLM "error uploading source" message?

Usually means the content is private, paywalled, or blocked. Copy-paste the content manually as a text source to work around it.

What does "NotebookLM Invalid URL" mean?

NotebookLM cannot parse the link format. Use the full, clean direct URL — avoid shortened links, redirects, and playlist URLs.

Why is NotebookLM not working?

Most issues are source errors, browser glitches, or temporary outages. A hard refresh, cache clear, or re-signing in resolves most cases.

Why does NotebookLM say "Source is empty"?

The page was fetched but no readable text was found — usually a JavaScript-rendered page, image-only PDF, or a YouTube video without captions.

Can NotebookLM analyze spreadsheets?

Partially. It reads Google Sheets and CSV files as text, but cannot run calculations or generate charts. Best for finding patterns, not crunching formulas.

Can NotebookLM do data analysis?

Not in the traditional sense. It reads documents and finds patterns in text — it cannot run calculations, generate charts, or execute code.

How to use NotebookLM for studying

Upload your course materials as sources, use Notebook Guide for a study guide, then quiz yourself in the chat using your own notes.

How to use NotebookLM to study for an exam

Upload all exam materials, generate a study guide, then use the chat to create practice questions grounded in your specific course content.

How to use NotebookLM for research

Load your papers and sources, then ask cross-document questions. NotebookLM reads across all sources simultaneously and cites every answer.

What are the best uses for NotebookLM?

Research synthesis, exam prep, meeting prep, content research, and long-document review. It excels when you have multiple dense sources to understand together.

Is NotebookLM free?

Yes. The base version is free at notebooklm.google.com. NotebookLM Plus is available through Google One AI Premium or Workspace plans for higher limits.

How to use NotebookLM for presentation

Add your research sources, ask for an outline and key talking points, then copy the evidence-backed content into your slide tool. NotebookLM cannot create slides directly.

What are the best NotebookLM prompts for studying?

Specific, targeted prompts get the best results. Ask for practice questions, concept explanations, comparisons, and summaries grounded in your own materials.

What are good prompts for NotebookLM Audio Overview?

Use the customization field to direct tone, audience, and focus before generating. One or two short, directive sentences work better than long instructions.

Is there a YouTube to NotebookLM extension?

Yes. Browser extensions like Kaptex let you add any YouTube video to NotebookLM in one click without leaving the tab.

What are the best NotebookLM prompts? (Awesome list)

A curated list of the most effective NotebookLM prompts for research, studying, writing, and Audio Overview — organized by use case.

Can I use NotebookLM with Google Sheets?

Yes. Link a Google Sheet as a source and NotebookLM reads the cell data as text. It cannot run formulas or calculations, but you can ask questions about the data.

Can I use NotebookLM with Excel files?

Not directly — Excel (.xlsx) is not a supported file type. Export to CSV or copy the data as text, then upload it as a source.

Can I upload a CSV file to NotebookLM?

Yes. Upload your CSV as a text source and NotebookLM reads the data as plain text, letting you ask questions and find patterns.

What does "The system was unable to generate a guide for this source" mean in NotebookLM?

NotebookLM imported the source but could not generate a study guide from it — usually because the content is too short, too sparse, or in a format it cannot interpret well.

Why is NotebookLM not loading?

Usually a browser issue, a Google account conflict, or a temporary outage. Hard refresh, try incognito, or check Google's service status.

How to use NotebookLM for teaching

Upload course materials, generate lesson plans and discussion questions, and use Audio Overview to give students a podcast-style introduction to any topic.

What is NotebookLM used for?

NotebookLM is a free AI research assistant that lets you query, summarize, and cross-reference your own uploaded documents — PDFs, YouTube videos, Google Docs, and more.

Does NotebookLM train on your data?

No. Google has confirmed that NotebookLM does not use your uploaded sources or conversations to train its AI models.

Is NotebookLM really private?

Your sources are not used to train AI models and are not visible to other users. However, content passes through Google's servers — treat it like any Google Docs file.

Can NotebookLM search the internet?

No. NotebookLM does not browse the internet. It only works with sources you explicitly upload or link — every answer comes from your documents, not the web.

Can NotebookLM make flash cards?

Yes. The Notebook Guide generates flashcards automatically. You can also request custom sets in the chat: "Create 20 flashcards from this chapter."

What is the difference between NotebookLM and Perplexity?

NotebookLM works only with sources you upload. Perplexity searches the internet in real time. They complement each other — use Perplexity to find sources, then NotebookLM to analyze them.

Is NotebookLM the same as ChatGPT?

No. ChatGPT draws on broad training data to answer anything. NotebookLM only answers from sources you provide — and cites every claim back to them.

What is a good alternative to NotebookLM?

It depends on the use case. For web search with citations: Perplexity. For general AI: ChatGPT or Claude. For academic papers: Elicit. For note-taking AI: Notion AI.

What are the limitations of Google NotebookLM?

No internet access, 50-source limit per notebook, no video file uploads, no calculations, no export, and source capture can be slow for large research sessions.

Is NotebookLM allowed in university?

Usually yes for studying and research comprehension — but using it to write assessed work without disclosure likely violates academic integrity policies.

Is NotebookLM free for students?

Yes. NotebookLM is free for anyone with a Google account, including students. No student plan needed — the free tier covers all core features.

Can I use NotebookLM on my phone?

Yes, via the mobile browser — there is no dedicated app. Open notebooklm.google.com in Chrome or Safari on your phone and it works.

How do I remove the NotebookLM watermark?

The fastest method is the free Kaptex NotebookLM Watermark Remover — upload your PDF, PPTX, or PNG and get a clean download in seconds. No signup, nothing uploaded to any server, all in your browser.

How to remove the NotebookLM watermark from slides

Upload your PPTX or PDF export to the free Kaptex watermark remover — it strips the watermark from all slides at once in your browser, no signup needed.

How to remove the NotebookLM watermark from a PDF

Upload the exported PDF to the free Kaptex watermark remover — it cleans every page in one step without any signup or server upload.

How to remove the NotebookLM watermark from a video

NotebookLM does not export video files — the watermark appears on exported slides (PDF, PPTX, PNG). Remove it from your slides before recording, or use a video editor to crop or cover it afterward.

Is there a NotebookLM watermark remover?

Yes. Kaptex offers a free in-browser tool that removes the NotebookLM watermark from PDF, PPTX, and PNG files — no signup, no server upload required.