Skip the Invoice Data Entry: AI Invoice Automation, PDF to Email
Katya Dominguez
The problem
In bookkeeping, someone logs each invoice in a spreadsheet by hand and then writes the email to the client who owes it.
What I built
A new invoice PDF lands in a Google Drive folder, and the n8n workflow starts.
n8n reads the text, and Gemini pulls out the invoice details.
n8n adds a row to Google Sheets.
OpenAI writes the email to the client who owes the invoice, and Gmail sends it.
Tools
n8n, Gemini, OpenAI, Google Sheets and Gmail.
The result
Each invoice lands in Sheets and the client gets the email, with nobody retyping a line.
My role
I built the workflow and set up the extraction step.
Next step
A workflow like this fits the AI Automation Sprint. Start with the Free AI Systems Fit Call and bring 3 sample invoices.
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Posted Oct 3, 2026
Drop an invoice PDF in Google Drive. n8n reads it, logs it in Google Sheets, and OpenAI writes the email to the client who owes it.
