What are the limitations of Google NotebookLM?

Key limitations to know before relying on NotebookLM:

• No internet access — works only with sources you upload, no real-time information
• 50 source limit per notebook — large research projects need multiple notebooks
• No video file support — only YouTube URLs with captions; no MP4, MOV uploads
• No calculations — reads spreadsheet data as text but cannot run formulas or analysis
• No content export — notebook outputs cannot be exported as PDF or DOCX directly
• No real-time collaboration — notebooks are single-account; no live co-editing
• Source capture friction — adding sources one at a time is slow during heavy research sessions; tools like Kaptex speed this up with bulk import and one-click capture
• Paywalled pages fail — URLs behind login or paywalls import as empty sources