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AI assistant · requirements recordVerified 2026-10-05

NotebookLM upload limit: 200 MB · 500,000 words

Sources per notebook. Per source. On 2026-10-05 the NotebookLM help URL redirected to a help center titled "Gemini Notebook Help"; the limits below are from that page.

The record

3 sourced fields · 1 source page
File size
200 MB or 500,000 words per source
In their words“Each source can contain up to 500,000 words or up to 200MB for uploaded files.”
support.google.com/notebooklm/answer/16215270 · checked 2026-10-05 · re-check every 30 days
Also
50 sources (free)
In their words“You can include up to 50 sources (for Free users).”
support.google.com/notebooklm/answer/16215270 · checked 2026-10-05 · re-check every 30 days
Formats
PDF, DOCX, TXT, MD, CSV, PPTX
In their words“Microsoft Word (docx), Text (txt), Markdown (md), PDF files (pdf), CSV (csv), and PowerPoint (pptx) files”
support.google.com/notebooklm/answer/16215270 · checked 2026-10-05 · re-check every 30 days

Related limits

AI ASSISTANTClaude500 MB · 1,000 pageschecked 2026-10-05 AI ASSISTANTGemini100 MBchecked 2026-10-05 EMAILGmail25 MBchecked 2026-10-05 COURTU.S. District Court, N.D. Cal.Under 50 MBchecked 2026-10-05

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