Generate AI newsletter drafts from Google Sheets to Notion with GPT-5-mini

How it works:

This template turns rows in a Google Sheet into polished newsletter drafts in Notion using an AI writing agent. You click Execute workflow in n8n. It fetches all rows marked N8n Status = Pending, generates a draft from Newsletter Title and About the Newsletter, creates a Notion page, writes the full draft, then flips the sheet row to Done before moving to the next one.

Before you start (use your own credentials):

• Create and select your credentials in n8n:

  • Google Sheets (OAuth2 or Service Account) with access to the target spreadsheet.
  • Notion (Internal Integration) with access to the target database.
  • OpenAI (API Key) for the Chat Model.

• Replace any placeholders in nodes:

  • Spreadsheet ID/URL and sheet/tab name (e.g., newsletter).
  • Notion Database ID / Parent and any page or block IDs used by HTTP Request nodes.
  • OpenAI model name if you prefer a different model.

• Give the Notion integration access to the database (Share → Invite the integration).

• Do not hard-code secrets in nodes. Store them in n8n Credentials.

Step-by-step:

1. Manual Trigger Start the run with When clicking ‘Execute workflow’.

2. Fetch pending input (Google Sheets → Get row(s) in sheet) Read the newsletter tab and pull only rows where N8n Status = Pending.

3. Iterate (Split In Batches → Loop Over Items) Process one sheet row at a time for stable memory use and pacing.

4. Generate the newsletter (AI Agent + OpenAI Chat Model)

   • AI Agent loads the “System Role Instructions” that define style, sections, and format.
   • Pass Newsletter Title and About the Newsletter to the OpenAI Chat Model to produce the draft.

5. Create a Notion page (Notion → Create Page) Create a page in your Newsletter Automation database with the page title set from Newsletter Title.

6. Prepare long content for Notion (Code) Split the AI output into ~1,800-character chunks and wrap as Notion paragraph blocks to avoid payload limits.

7. Write content blocks to Notion (HTTP Request → UpdateNotionBlock) Send a PATCH request to append all generated blocks so the full draft appears on the page.

8. Mark the sheet row as done (Google Sheets → Update row in sheet) Update N8n Status = Done for the processed Newsletter Title.

9. Continue the loop Return to Split In Batches for the next pending row until none remain.

Tools integration:

• Google Sheets — input queue and status tracking (Pending → Done)
• OpenAI — LLM that writes the draft from provided fields
• Notion — destination database for each draft page
• n8n Code + HTTP Request — chunking and Notion API block updates

Want auto-runs? Add a Cron trigger before step 2 and keep the flow unchanged.