source-lm

About source-lm

A Chrome extension that bulk-uploads sources to Google NotebookLM without manual entry. It accepts JSON exports, Telegram chat dumps, support-ticket files or lists of URLs and converts them into Markdown files within NotebookLM’s 500,000-word source cap. Each file is capped at 400,000 words to maintain a margin under the limit. A second run uploads only new records by reading the notebook’s existing source names, avoiding duplicates. The extension also supports bulk YouTube uploads via injected buttons on watch, playlist and channel pages, including comment threads as separate sources. Users can right-click highlighted text on any page to add it directly to a notebook as a new source. The tool tracks broken sources—pages NotebookLM failed to fetch—and allows replacing them with the current page text. All processing happens in memory; no files are written to disk and no backend is used. The extension communicates only with NotebookLM’s origin, Google’s upload host and the payment provider’s public endpoint for license checks.

Key features

• ✓Bulk upload from JSON, Telegram chats, support tickets or URL lists
• ✓Right-click to add selected text as a new source
• ✓YouTube bulk uploads with comment threads as separate sources
• ✓Broken source replacement with current page text
• ✓Preview of files and word counts before upload
• ✓Duplicate detection and batch deletion in NotebookLM’s Sources panel
• ✓No local files created; all processing in memory
• ✓Source-available code under a noncommercial license

Use cases

• ✓Migrating large datasets like chat logs or ticket dumps into NotebookLM
• ✓Archiving YouTube channels or playlists with comments as sources
• ✓Replacing broken or inaccessible sources with current page content

source-lm videos

Frequently asked questions about source-lm