NotebookLM Highlight to Explain

Explain, summarize, or create examples from highlighted NotebookLM text and insert the prompt into chat. NotebookLM Highlight to Explain helps you move from reading sources to asking better questions in Google NotebookLM. Highlight text inside NotebookLM, press Cmd+E (macOS) or Ctrl+E (Windows/Linux/ChromeOS), then choose Explain, Example, or Summarize. The extension inserts a ready-to-send prompt into the NotebookLM chat panel. If the highlight comes from a source, it includes the source title when it can detect one. Useful for students, teachers, researchers, and anyone using NotebookLM to study documents, lecture notes, reports, or PDFs. Features:

• Highlight NotebookLM text and open a focused prompt popup.
• Add explain, example, or summarize prompts to NotebookLM chat.
• Include the selected source title when the highlight comes from a source.
• Keep the prompt editable before sending.
• Works only on https://notebooklm.google.com/*.

This is an independent tool and is not affiliated with Google or NotebookLM.

--- What's new in v0.2.0:

• Customizable Prompts: You can now edit the default prompt templates for Explain, Example, and Summarize.
• Settings Page: Accessible via the new gear icon in the popup, where you can modify templates using {source} and {selection} placeholders.
• Account Syncing: Custom prompt templates automatically save and sync across all your devices using Chrome Storage Sync.
• Improved International Support: Enhanced chat box detection for non-English UI settings (supporting Turkish, Spanish, German, French, Italian, and Portuguese).
• Selection Bug Fixes: Corrected source title extraction issues when highlighting text inside bulleted lists.