Source LM

Get sources into NotebookLM in bulk Source LM is a Chrome extension that gets material into a NotebookLM or Gemini Notebook notebook in bulk, without downloading anything to disk. Three inputs JSON datasets — a JSON export (e.g. a Telegram chat export) is split into Markdown files word-budgeted under NotebookLM’s 500,000-word per-source cap. Records are never split across files, and re-running uploads only the new records. YouTube — “Add to notebook” buttons injected into YouTube’s own UI add the current video, a playlist, or a channel’s latest N videos as one source per video, with optional top comment threads. Links and pages — a pasted URL list, the current page, or a right-click on selected text. Source management extras Batch source deletion Duplicate-source finder Broken-source listing with manual replace Source filter box No backend, no account, no telemetry: the extension talks only to the notebook page’s own origin. Source-available under the PolyForm Noncommercial License 1.0.0, shipped unminified. Pricing: free plan is 5 bulk actions per month, single sources always free. Pro is $29 one-time, not a subscription.