Parse invoices & documents with Gemini AI, OCR, and Google Sheets integration

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Important notice

This workflow is provided as-is. Please review and test before using in production.

1. Workflow Overview

Smart Document Parser for Invoices, Logs or Sensor Reports (PDF/Image to Google Sheets) This n8n workflow automatically parses documents such as invoices, sensor logs or structured PDFs/images (inc...

Best for

Invoice Processing automation workflows
Multimodal AI automation workflows
intermediate n8n builders looking for reusable templates

Tools used

n8n-nodes-base.switch, n8n-nodes-base.googlesheets, n8n-nodes-base.code, @n8n/n8n-nodes-langchain.lmchatgooglegemini, @n8n/n8n-nodes-langchain.chainllm, n8n-nodes-base.webhook, n8n-nodes-base.extractfromfile, n8n-nodes-tesseractjs.tesseractnode

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by WeblineIndia.

Original n8n.io source

1.1 Workflow description

Title: Parse invoices & documents with Gemini AI, OCR, and Google Sheets integration
Workflow name: Parse invoices & documents with Gemini AI, OCR, and Google Sheets integration

Smart Document Parser for Invoices, Logs or Sensor Reports (PDF/Image to Google Sheets)

This n8n workflow automatically parses documents such as invoices, sensor logs or structured PDFs/images (including scanned docs or CSVs), extracts key fields like totals, dates and customer/vendor info using OCR and AI, and writes the structured output into Google Sheets.

Who’s it for

Finance or Ops teams automating invoice processing.
SaaS platforms parsing uploaded reports or documents.
Anyone needing a no-code backend for PDF/image/CSV document parsing.
AI-powered data capture pipelines.

How it works

Webhook Trigger receives file uploads (/uploadDoc)
Switch Node checks the file type:
- If image → Use Tesseract OCR
- If PDF → Use PDF parser
- If CSV → Extract as-is
Extracted text is passed to:
- Google Gemini or Gemini Flash AI model
- Prompt extracts fields like invoice_id, total, customer_name, etc.
JSON string is parsed and cleaned
Data is appended to Google Sheets using appendOrUpdate

How to set up

Create a Google Sheet with columns like:

invoice_id, invoice_date, due_date, customer_name, vendor_name, subtotal, tax_total, total, currency

Connect:
- Google Sheets OAuth
- Google Gemini (PaLM API key) for LLM parsing
Deploy the webhook endpoint: /uploadDoc
Upload sample files (PDFs, images, CSVs) to test
Review and map sheet columns in the Invoice Data node

Requirements

Tool	Purpose
n8n	Automation framework
Google Sheets	To store structured output
Tesseract OCR	For scanned image text extraction
Google Gemini	For natural language parsing

How to customize

Add extraction for line items using structured prompts.
Change prompt to extract sensor readings, log types, or custom keys.
Add support for other file types (e.g., XLSX, DOCX).
Add Slack/Email notifications on success/failure.
Swap Gemini with OpenAI or Hugging Face if preferred.

Add‑ons

Save uploaded files to Google Drive or S3
Add auth for secure uploads
Use charting/dashboard nodes to visualize extracted data
Integrate with billing/accounting software

Use Case Examples

Scenario	What Happens
Invoice Upload (PDF)	Extracts totals, customer, tax data into a Google Sheet
Scanned Receipt (Image)	OCR + LLM extracts structured data
Log File (CSV)	Parses and logs entries into Sheets

Common troubleshooting

Issue	Possible Cause	Solution
`Webhook not triggered`	URL or method mismatch	Use correct POST URL `/uploadDoc`
`Text is blank`	OCR failed	Check image quality or Tesseract config
`Gemini model not returning JSON`	Prompt formatting issue	Ensure prompt ends with valid JSON schema
`Sheet not updated`	Invalid Sheet ID or tab	Double-check sheet credentials and tab name

Need Help?

Need help fine-tuning the Gemini prompt for better field accuracy?
Want to extract full tables, multi-page invoices or convert PDFs to JSON lines?

Our automation team at WeblineIndia can help you extend this into a full-blown document automation pipeline.

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - Check file type

Type / Role: n8n-nodes-base.switch - switch
Config choices: Version 3.2

Block 2 - Invoice data

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.6

Block 3 - Invoice Data

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.6

Block 4 - Transfrom data

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 5 - Google Gemini Chat Model

Type / Role: @n8n/n8n-nodes-langchain.lmChatGoogleGemini - lmChatGoogleGemini
Config choices: Version 1

Block 6 - Format data from text

Type / Role: @n8n/n8n-nodes-langchain.chainLlm - chainLlm
Config choices: Version 1.7

Block 7 - Webhook Invoice upload

Type / Role: n8n-nodes-base.webhook - webhook
Config choices: Version 2

Block 8 - PDF to Text

Type / Role: n8n-nodes-base.extractFromFile - extractFromFile
Config choices: Version 1

Block 9 - Image to Text

Type / Role: n8n-nodes-tesseractjs.tesseractNode - tesseractNode
Config choices: Version 1

Block 10 - CSV to JSON

Type / Role: n8n-nodes-base.extractFromFile - extractFromFile
Config choices: Version 1

Block 11 - Sticky Note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 12 - Sticky Note1

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

3. Summary Table

Workflow	Parse invoices & documents with Gemini AI, OCR, and Google Sheets integration
Complexity	intermediate
Nodes	12
Categories	Invoice Processing, Multimodal AI
Author	WeblineIndia
Published	11 Aug 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/7239/7239.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source Invoice Processing workflows Multimodal AI workflows

Frequently asked questions

What does Parse invoices & documents with Gemini AI, OCR, and Google Sheets integration do?

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your Invoice Processing, Multimodal AI use case.

WeblineIndia

216 workflows

Nodes

n8n-nodes-base.switch n8n-nodes-base.googlesheets n8n-nodes-base.code @n8n/n8n-nodes-langchain.lmchatgooglegemini @n8n/n8n-nodes-langchain.chainllm n8n-nodes-base.webhook n8n-nodes-base.extractfromfile n8n-nodes-tesseractjs.tesseractnode

Complexity

intermediate

Published 11 Aug 2025

Likes 0

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Install path: /data/workflows/7239/7239.json

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Parse invoices & documents with Gemini AI, OCR, and Google Sheets integration

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Smart Document Parser for Invoices, Logs or Sensor Reports (PDF/Image to Google Sheets)

Who’s it for

How it works

How to set up

Requirements

How to customize

Add‑ons

Use Case Examples

Common troubleshooting

Need Help?

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Check file type

Block 2 - Invoice data

Block 3 - Invoice Data

Block 4 - Transfrom data

Block 5 - Google Gemini Chat Model

Block 6 - Format data from text

Block 7 - Webhook Invoice upload

Block 8 - PDF to Text

Block 9 - Image to Text

Block 10 - CSV to JSON

Block 11 - Sticky Note

Block 12 - Sticky Note1

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions