Extract & structure invoice data with Google Vision OCR, Gemini LLM & Google Sheets

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Important notice

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

1. Workflow Overview

Automated Invoice Collection & Data Extraction Using Vision API and LLM This workflow automates the process of collecting uploaded invoices, extracting text using Google Vision API , and processing...

Best for

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

Tools used

n8n-nodes-base.stickynote, n8n-nodes-base.set, @n8n/n8n-nodes-langchain.chainllm, @n8n/n8n-nodes-langchain.lmchatopenrouter, @n8n/n8n-nodes-langchain.outputparserstructured, n8n-nodes-base.googledrive, n8n-nodes-base.httprequest, n8n-nodes-base.telegram

Source and attribution

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

Original n8n.io source

1.1 Workflow description

Title: Extract & structure invoice data with Google Vision OCR, Gemini LLM & Google Sheets
Workflow name: Extract & structure invoice data with Google Vision OCR, Gemini LLM & Google Sheets

Automated Invoice Collection & Data Extraction Using Vision API and LLM

This workflow automates the process of collecting uploaded invoices, extracting text using Google Vision API, and processing the extracted text with an LLM to produce structured data containing key transaction details such as date, voucher number, transaction detail, vendor, and transaction value.
The final data is saved to Google Sheets and a notification is sent to Telegram in real time.

✨ Key Features

Invoice Upload Form
Users can upload invoice images through a provided form.
Google Drive Integration
Files are stored in a specified Google Drive folder with a shareable preview link.
OCR via Google Vision API
Converts invoice images to text using TEXT_DETECTION.
Data Structuring via LLM
Uses LLM model to parse and structure data.
Structured Output Parser
Ensures consistent output with required columns.
Data Cleaning
Cleans and formats numeric values without currency symbols.
Google Sheets Sync
Appends or updates transaction data in Google Sheets (matched by file ID).
Template: Google Sheets
Telegram Notification
Sends a transaction summary directly to a Telegram chat/group.

🔐 Required Credentials

Google Vision API Key → for OCR processing.
OpenRouter API Key → to access the Gemini Flash LLM.
Google Drive OAuth2 → to upload and download invoice files.
Google Sheets OAuth2 → to write or update spreadsheet data.
Telegram Bot Token → to send notifications to Telegram.
Telegram Chat ID → target chat/group for notifications.

🎁 Benefits

Fully automated from invoice upload to structured reporting.
Time-saving by eliminating manual transaction data entry.
Real-time integration with Google Sheets for reporting and auditing.
Instant notifications via Telegram for quick transaction monitoring.
Duplicate prevention using file ID as a matching key.
Flexible for accounting, finance, or administrative teams.

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 - Sticky Note1

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

Block 2 - Set Vision API

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 3 - Basic LLM Chain

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

Block 4 - OpenRouter Chat Model

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

Block 5 - Structured Output Parser

Type / Role: @n8n/n8n-nodes-langchain.outputParserStructured - outputParserStructured
Config choices: Version 1.3

Block 6 - Download file

Type / Role: n8n-nodes-base.googleDrive - googleDrive
Config choices: Version 3

Block 7 - HTTP Request

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 8 - Send a text message

Type / Role: n8n-nodes-base.telegram - telegram
Config choices: Version 1.2

Block 9 - Upload file

Type / Role: n8n-nodes-base.googleDrive - googleDrive
Config choices: Version 3

Block 10 - Code

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

Block 11 - Code1

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

Block 12 - Append or update row in sheet

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

Block 13 - On form submission

Type / Role: n8n-nodes-base.formTrigger - formTrigger
Config choices: Version 2.2

Block 14 - Sticky Note2

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

Block 15 - Sticky Note

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

Block 16 - Sticky Note3

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

Block 17 - Sticky Note4

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

3. Summary Table

Workflow	Extract & structure invoice data with Google Vision OCR, Gemini LLM & Google Sheets
Complexity	advanced
Nodes	17
Categories	Invoice Processing, Multimodal AI
Author	Budi SJ
Published	12 Aug 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/7302/7302.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 Extract & structure invoice data with Google Vision OCR, Gemini LLM & Google Sheets 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.

Budi SJ

11 workflows

Nodes

n8n-nodes-base.stickynote n8n-nodes-base.set @n8n/n8n-nodes-langchain.chainllm @n8n/n8n-nodes-langchain.lmchatopenrouter @n8n/n8n-nodes-langchain.outputparserstructured n8n-nodes-base.googledrive n8n-nodes-base.httprequest n8n-nodes-base.telegram

Complexity

advanced

Published 12 Aug 2025

Likes 0

View on n8n.io Download Workflow

Install path: /data/workflows/7302/7302.json

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Extract & structure invoice data with Google Vision OCR, Gemini LLM & Google Sheets

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Automated Invoice Collection & Data Extraction Using Vision API and LLM

✨ Key Features

🔐 Required Credentials

🎁 Benefits

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Sticky Note1

Block 2 - Set Vision API

Block 3 - Basic LLM Chain

Block 4 - OpenRouter Chat Model

Block 5 - Structured Output Parser

Block 6 - Download file

Block 7 - HTTP Request

Block 8 - Send a text message

Block 9 - Upload file

Block 10 - Code

Block 11 - Code1

Block 12 - Append or update row in sheet

Block 13 - On form submission

Block 14 - Sticky Note2

Block 15 - Sticky Note

Block 16 - Sticky Note3

Block 17 - Sticky Note4

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