Log LINE invoice photos to Google Sheets with OCR.space and Gemini AI

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1. Workflow Overview

Who is this for Freelancers, small business owners, and accounting teams in Japan who receive invoices and want to eliminate manual data entry into spreadsheets. What this workflow does Send an inv...

Best for

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

Tools used

@n8n/n8n-nodes-langchain.lmchatgooglegemini, n8n-nodes-base.stickynote, n8n-nodes-base.webhook, n8n-nodes-base.respondtowebhook, n8n-nodes-base.if, n8n-nodes-base.set, n8n-nodes-base.httprequest, n8n-nodes-base.code

Source and attribution

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

Original n8n.io source

1.1 Workflow description

Title: Log LINE invoice photos to Google Sheets with OCR.space and Gemini AI
Workflow name: Log LINE invoice photos to Google Sheets with OCR.space and Gemini AI

Who is this for

Freelancers, small business owners, and accounting teams in Japan who receive invoices and want to eliminate manual data entry into spreadsheets.

What this workflow does

Send an invoice photo to your LINE bot and the rest is automatic. The workflow fetches the image via LINE Messaging API, runs it through OCR.space to extract raw text, then passes that text to a Gemini AI Agent to parse the key fields — invoice number, date, due date, vendor name, subtotal, tax, and total. The result is appended as a new row in your Google Sheets ledger and a confirmation is sent back to LINE. If the image is not an invoice, a friendly error message is returned instead.

How to set up

Create a LINE Messaging API channel and get your Channel Access Token
Get a free OCR.space API key at ocr.space/ocrapi/freekey
Get a free Gemini API key at aistudio.google.com
Set up Google Sheets OAuth2 credentials in n8n
Enter your LINE token, OCR key, and Spreadsheet ID in the Variables node
Set the Webhook URL in LINE Developers to your n8n instance URL
Activate the workflow and send an invoice photo to your LINE bot

Requirements

LINE Messaging API channel and channel access token
OCR.space API key (free tier: 25,000 requests/month)
Google Gemini API key (free tier: 1,500 requests/day)
Google Sheets with OAuth2 credentials configured in n8n

How to customize

Change SHEET_NAME in the Variables node to file invoices by month. Edit the Gemini prompt to capture extra fields like bank details or line items. Swap OCR.space for Google Cloud Vision API if you need better accuracy on complex layouts.

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 - Google Gemini Chat Model

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

Block 2 - Sticky Note

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

Block 3 - Receive LINE Webhook

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

Block 4 - Return 200 OK to LINE

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

Block 5 - Check Image Message

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

Block 6 - Variables (API Key Management)

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

Block 7 - Fetch Image from LINE

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

Block 8 - Convert Image to Base64

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

Block 9 - OCR - Extract Text from Image

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.4

Block 10 - AI Agent - Parse Invoice with Gemini

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 3.1

Block 11 - Parse & Format JSON

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

Block 12 - Error Check

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2.3

Block 13 - Append to Google Sheets

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.4

Block 14 - LINE Reply - Success

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.4

Block 15 - LINE Reply - Error

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.4

Block 16 - LINE Reply - Not an Image

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.4

Block 17 - Sticky Note1

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

Block 18 - Sticky Note2

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

Block 19 - Sticky Note3

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

Block 20 - Sticky Note4

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

Block 21 - Sticky Note5

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

Block 22 - Sticky Note6

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

3. Summary Table

Workflow	Log LINE invoice photos to Google Sheets with OCR.space and Gemini AI
Complexity	advanced
Nodes	22
Categories	Invoice Processing, AI Summarization
Author	Ryo Sayama
Published	21 Mar 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/14210/14210.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 AI Summarization workflows

Frequently asked questions

What does Log LINE invoice photos to Google Sheets with OCR.space and Gemini AI 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, AI Summarization use case.

Ryo Sayama

6 workflows

Nodes

@n8n/n8n-nodes-langchain.lmchatgooglegemini n8n-nodes-base.stickynote n8n-nodes-base.webhook n8n-nodes-base.respondtowebhook n8n-nodes-base.if n8n-nodes-base.set n8n-nodes-base.httprequest n8n-nodes-base.code

Complexity

advanced

Published 21 Mar 2026

Likes 0

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Install path: /data/workflows/14210/14210.json

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Log LINE invoice photos to Google Sheets with OCR.space and Gemini AI

Workflow preview

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Who is this for

What this workflow does

How to set up

Requirements

How to customize

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Google Gemini Chat Model

Block 2 - Sticky Note

Block 3 - Receive LINE Webhook

Block 4 - Return 200 OK to LINE

Block 5 - Check Image Message

Block 6 - Variables (API Key Management)

Block 7 - Fetch Image from LINE

Block 8 - Convert Image to Base64

Block 9 - OCR - Extract Text from Image

Block 10 - AI Agent - Parse Invoice with Gemini

Block 11 - Parse & Format JSON

Block 12 - Error Check

Block 13 - Append to Google Sheets

Block 14 - LINE Reply - Success

Block 15 - LINE Reply - Error

Block 16 - LINE Reply - Not an Image

Block 17 - Sticky Note1

Block 18 - Sticky Note2

Block 19 - Sticky Note3

Block 20 - Sticky Note4

Block 21 - Sticky Note5

Block 22 - Sticky Note6

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