Extract Invoice Data from Email to Google Sheets with GPT-4o

Transform manual invoice processing into an intelligent automation with this n8n workflow. It monitors Gmail for labeled emails with PDF attachments, extracts text, analyzes content via GPT-4o to pull key financial details like invoice numbers, dates, line items, taxes, addresses, and more, then formats data into JSON and generates timestamped Google Sheets.

The workflow features 8 steps: intelligent email polling every minute, attachment filtering for PDFs only, PDF-to-text conversion, AI-powered extraction with specialized prompts handling diverse formats, JSON structuring of 25+ fields, dynamic sheet creation per invoice, data population with organized tables, and optional error handling or notifications to ensure reliability.

Benefits include massive time savings on data entry, reduced errors from manual input, scalability for high-volume invoicing, and integration-ready outputs for accounting software. Ideal for finance teams, small businesses, freelancers, and AP departments processing vendor invoices, expenses, or reimbursements efficiently.