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Read mixed-format invoice files with OCR before AI field extraction

At a glance

An English n8n tutorial uses Google Vision OCR for PDF and image invoices, an LLM for structured fields, and Google Sheets for storage, making the OCR-to-extraction sequence explicit. This workflow is listed under builder, n8n, ocr, invoice-extraction, multimodal-input.

Agents / tools
n8n, Google Vision OCR, Google Drive, Google Sheets, LLM

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Prompt excerpt

Rebuild the video workflow with a test Google Drive folder. Add sample PDF, JPG, and PNG invoices, run them through Google Vision OCR, and have the LLM return a fixed vendor/date/tax/total schema. Map those fields to a test Sheet and compare the extracted amounts against each original file.
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docsbuilder

Detect duplicate invoices and pause risky approvals in n8n

This n8n template extracts invoice PDFs with GPT-4o, checks invoice numbers and totals, assesses category and risk, and uses a wait-and-resume approval path before recording the final status.

n8nOpenAI GPT-4oGoogle Sheets+1
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