Browser Extensions & Plugins · Spain
Chrome extension to bulk-add sources to NotebookLM from JSON exports, YouTube, and web pages
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A Chrome extension that automates adding sources to NotebookLM in bulk from JSON files, YouTube videos, and web pages, without requiring an account or backend.
source-lm is a Chrome extension that lets you add multiple sources to NotebookLM at once, instead of one at a time. It takes JSON exports like Telegram chats and splits them into Markdown files under a 400,000-word budget, uploads YouTube videos individually or in bulk from watch, playlist and channel pages, and adds web pages and selected text from a right-click menu. Inside NotebookLM it adds filtering, duplicate detection, and batch deletion to the Sources panel.
The extension runs entirely in your browser with no backend, no account, no recurring costs, and no data stored on servers. It is source-available and published unminified so you can read the code. A one-time $29 licence gives unlimited bulk uploads; the free plan includes 5 bulk actions per month and single sources always remain free.
Pricing model: Paid
Free plan: 5 bulk actions per month, single sources always free. Pro licence: $29 one time, unlimited bulk runs.
It automates adding sources to NotebookLM in bulk from three input types: JSON exports like Telegram chats (split into multiple Markdown files), YouTube videos from watch, playlist, and channel pages (individually or multi-select), and web pages or selected text (via right-click menu or a list of URLs). It also adds filtering, duplicate detection, batch deletion, and a broken sources list to NotebookLM's Sources panel.
Yes, in both formats. Telegram Desktop exports as JSON or HTML; Telegram for macOS (version 12.10 and later) also has an Export Chat History feature that writes HTML. Select all messages.html pages at once and the extension orders them automatically. Text only is captured; photos, voice messages, and stickers are not included.
There is no backend and no recurring costs behind the extension, so there is nothing to bill monthly for. You pay once and keep the licence. The extension does rely on an unpublished Google interface that can change without notice, which is another reason not to charge a recurring subscription.
The 5 bulk actions per month is the ceiling on batch uploads and multi-video adds across all input methods. Single sources—one page, one link, or one video—and deleting sources continue to work regardless, and the count resets on the 1st of each month.
Requests go only to NotebookLM's own origin, Google's upload host, and the payment provider's public endpoint for licence checks. There is no author-controlled server, no telemetry, and no analytics. Settings, the licence key, and trial counter live in chrome.storage.sync, which Chrome syncs to your own Google account.
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source-lm has a free listing. The owner can unlock the full profile with a paid launch for $5:
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