How to Save Reddit Threads to NotebookLM (Post + Comments)

TL;DR: Pasting a Reddit URL into NotebookLM usually returns almost nothing — Reddit pages don't load the way NotebookLM expects. Kaptex captures the post and top comments as clean, readable text and sends them to your notebook in one click.

Why Reddit URLs don't work in NotebookLM

You paste a Reddit URL into NotebookLM. It processes, then comes back with almost nothing useful — maybe the post title, rarely the body, and none of the comments.

Reddit loads its content in a way that external tools struggle to read. When NotebookLM fetches a Reddit URL, it doesn't see the same thing you see in your browser — it gets back a near-empty page. The discussion that made the thread worth saving is invisible to it. The manual workaround people use is to export the thread to PDF and upload it, which is slow and still misses most of the comments.

How to save a Reddit thread to NotebookLM

Kaptex fetches the thread properly — post title, body, and top comments — formats it as clean text, and sends it to your notebook. One click while you're on the page.

Step 1: Install Kaptex and select your notebook

Install Kaptex from the Chrome Web Store and open the side panel. Select the NotebookLM notebook you want to save to.

The selection stays as you navigate between tabs, so it's still set when you land on a Reddit thread.

Step 2: Open the Reddit thread you want to save

Go to any Reddit thread. Kaptex injects a floating "Add to notebook" button on the page.

Step 3: Click the button and preview what's being saved

Click "Add to notebook." Kaptex fetches the post and top comments, then shows you a preview of exactly what will be saved before anything is sent. You can see the post title, body, and comments clearly laid out before confirming.

Step 4: Confirm and check your notebook

Confirm the save. The thread appears in NotebookLM as a source — post and comments organized and readable — that NotebookLM can actually reference when you ask it questions.

Wrap-up

Reddit threads are often the most useful signal in a research project — real user opinions, niche comparisons, and first-hand experiences that don't show up in formal articles. Once a thread is in NotebookLM, you can query it alongside your other sources: papers, PDFs, saved AI conversations from Claude or ChatGPT. Useful for market research, competitive analysis, or any work where community knowledge matters as much as official sources.

You can try it free at kaptex.io — 10 saves per day on the free plan.

Frequently Asked Questions

Why does pasting a Reddit URL into NotebookLM return almost nothing?

Reddit loads its content in a way that doesn't work well when fetched directly by external tools. When NotebookLM fetches the URL, it gets back a near-empty page — not the thread you see in your browser. Kaptex fetches the content in a way that actually returns the post and comments.

Which comments does Kaptex capture?

Kaptex captures the top-voted comments. You can preview exactly what's included before confirming the save.

Can I save a thread from the Kaptex side panel instead of using the on-page button?

Yes. You can paste the Reddit URL directly into the side panel's URL field and save from there — useful if you want to save a thread you're not currently browsing.

Does this work for all subreddits?

Kaptex can save any publicly visible Reddit thread. If you can read the thread in your browser, Kaptex can generally capture it.

What about very long threads with hundreds of comments?

Kaptex focuses on the top-voted comments rather than capturing everything. This keeps the source focused on the most relevant content and avoids sending more text than NotebookLM needs to be useful.