NotebookLM Deduper

Instantly scan your Google NotebookLM notebooks and safely remove duplicate sources with one click.

What's New in Version 1.8.1: 🔍 Complete Notebook Deep Scan Have a notebook with dozens or hundreds of sources? NotebookLM Deduper now automatically scrolls through long, virtualized lists to catch duplicates hiding far below the fold. 🛡️ Smarter, Safer Matching • No More False Alarms: Completely eliminated self-duplication bugs—only genuine duplicates are flagged. • Intelligent Copy Detection: Automatically catches downloaded duplicates like "Notes (copy)" or "Report (1)". • Numbered Series Protection: Documents like "Chapter 1" vs "Chapter 2" or "Option A" vs "Option B" are strictly protected and will never be confused for duplicates. ⚡ Smooth, Transparent Deletion • Step-by-Step Progress: Watch items delete one by one in real-time with a live progress indicator. • Instant Stop Button: Need to pause or change your mind? Hit "Stop" at any point during a batch removal. • One-Click Selection: Added convenient "Select all" and "Select none" controls to speed up your review. 🌍 Multilingual Support NotebookLM Deduper now speaks your language! Fully compatible with NotebookLM in English, Spanish, French, German, Portuguese, Italian, and Japanese. ♿ Accessibility & UI Polish Added full keyboard navigation support (visible focus indicators) and screen-reader compatibility for a smoother experience for everyone. Declutter your NotebookLM workspaces in seconds! Google NotebookLM is an incredible tool for AI-assisted research, but it currently lacks a native way to handle duplicate sources. If you've ever accidentally uploaded the same PDF, website, or document twice, you know how frustrating it is to manually hunt them down and delete them one by one to free up your source limit. NotebookLM Deduper solves this problem entirely. ✨ Features: Instant Scanning: Click the extension icon to instantly scan your active notebook for any duplicate source titles. Visual Checklist: Review all found duplicates in a sleek, modern interface. Uncheck any sources you want to keep. 1-Click Deletion: Click "Remove Selected" to automatically process and delete the duplicates from your notebook. Failsafe Security: Built with robust safety checks. The extension actively reads Google's confirmation modals to guarantee it never deletes the wrong file. 🛡️ Privacy & Security: No Data Collection: This extension runs entirely locally on your machine. It does not collect, store, or transmit your NotebookLM data, sources, or any personal information. Safe Automation: The script simply mimics human clicks within your browser, ensuring your NotebookLM workspace remains completely stable. Note: This extension is an independent tool and is not affiliated with, endorsed by, or sponsored by Google or NotebookLM. ⚠️ DISCLAIMER & LIMITATION OF LIABILITY This extension is provided "as is" and without warranty of any kind. By installing and using this extension, you agree that the developer is not responsible for any accidental data loss, deletion of sources, or damages resulting from the use of this software. Always review the highlighted duplicate sources carefully before clicking the delete button.