Extract invoice data with Google Gemini, Google Sheets, and Telegram

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1. Workflow Overview

Quick overview This workflow accepts invoice PDFs or images from an n8n Form or Telegram, uses Google Gemini to OCR and extract structured invoice fields and line items, appends the results to Goog...

Best for

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

Tools used

n8n-nodes-base.formtrigger, n8n-nodes-base.code, n8n-nodes-base.if, n8n-nodes-base.googlesheets, @n8n/n8n-nodes-langchain.googlegemini, n8n-nodes-base.splitout, n8n-nodes-base.telegramtrigger, 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 Hồ Đình Huy.

Original n8n.io source

1.1 Workflow description

Title: Extract invoice data with Google Gemini, Google Sheets, and Telegram
Workflow name: Extract invoice data with Google Gemini, Google Sheets, and Telegram

Quick overview

This workflow accepts invoice PDFs or images from an n8n Form or Telegram, uses Google Gemini to OCR and extract structured invoice fields and line items, appends the results to Google Sheets, and sends a success or rejection notification via Telegram.

How it works

Receives an invoice file upload either from an n8n Form or from a Telegram bot message.
Validates that the incoming file exists and is a supported PDF or image format, otherwise prepares a rejection message.
Uploads the file to Google Gemini and routes it to Gemini document analysis for PDFs or image analysis for images.
Parses Gemini’s JSON response, normalizes dates and numeric fields, and ensures line items are present as an array.
Splits the extracted line items into rows and appends the invoice data to an Invoices worksheet in Google Sheets.
Builds a processing summary and sends a Telegram notification for success, or sends the prepared rejection message for invalid files.

Setup

Add a Google Gemini (PaLM) API credential and select a Gemini model (for example, models/gemini-2.5-flash) in the Gemini nodes.
Add a Google Sheets OAuth2 credential and replace REPLACE_WITH_GOOGLE_SHEET_ID with your spreadsheet ID, ensuring an Invoices sheet exists.
Add a Telegram bot credential, set REPLACE_WITH_TELEGRAM_CHAT_ID, and (optionally) message your bot once so it can send you notifications.
If using the n8n Form entry point, open the form URL for the “invoice” path and use it as the upload page for PDF/image invoices.

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 - Upload Invoice Form

Type / Role: n8n-nodes-base.formTrigger - formTrigger
Config choices: Version 2.5

Block 2 - Prepare Invoice Input

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

Block 3 - File Is Processable?

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

Block 4 - Build Invalid File Result

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

Block 5 - Append Invoice to Google Sheets

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.7

Block 6 - Upload a media file

Type / Role: @n8n/n8n-nodes-langchain.googleGemini - googleGemini
Config choices: Version 1.2

Block 7 - Analyze document

Type / Role: @n8n/n8n-nodes-langchain.googleGemini - googleGemini
Config choices: Version 1.2

Block 8 - If

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

Block 9 - Analyze an image

Type / Role: @n8n/n8n-nodes-langchain.googleGemini - googleGemini
Config choices: Version 1.2

Block 10 - Normalize and Validate

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

Block 11 - Split Out

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

Block 12 - Telegram Trigger

Type / Role: n8n-nodes-base.telegramTrigger - telegramTrigger
Config choices: Version 1.3

Block 13 - Send Telegram Notification1

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

Block 14 - Send Telegram Rejection1

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

Block 15 - Build Success File

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

Block 16 - README - Workflow Overview

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

Block 17 - SETUP - Credentials and Required Config

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

Block 18 - USAGE - Upload Options

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

Block 19 - REFERENCE - Output Schema

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

Block 20 - TESTING - Creator Checklist

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

3. Summary Table

Workflow	Extract invoice data with Google Gemini, Google Sheets, and Telegram
Complexity	advanced
Nodes	20
Categories	Invoice Processing, AI Summarization
Author	Hồ Đình Huy
Published	25 May 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/15937/15937.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 Extract invoice data with Google Gemini, Google Sheets, and Telegram 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.

Hồ Đình Huy

2 workflows

Nodes

n8n-nodes-base.formtrigger n8n-nodes-base.code n8n-nodes-base.if n8n-nodes-base.googlesheets @n8n/n8n-nodes-langchain.googlegemini n8n-nodes-base.splitout n8n-nodes-base.telegramtrigger n8n-nodes-base.telegram

Complexity

advanced

Published 25 May 2026

Likes 0

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Install path: /data/workflows/15937/15937.json

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Extract invoice data with Google Gemini, Google Sheets, and Telegram

Workflow preview

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Quick overview

How it works

Setup

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Upload Invoice Form

Block 2 - Prepare Invoice Input

Block 3 - File Is Processable?

Block 4 - Build Invalid File Result

Block 5 - Append Invoice to Google Sheets

Block 6 - Upload a media file

Block 7 - Analyze document

Block 8 - If

Block 9 - Analyze an image

Block 10 - Normalize and Validate

Block 11 - Split Out

Block 12 - Telegram Trigger

Block 13 - Send Telegram Notification1

Block 14 - Send Telegram Rejection1

Block 15 - Build Success File

Block 16 - README - Workflow Overview

Block 17 - SETUP - Credentials and Required Config

Block 18 - USAGE - Upload Options

Block 19 - REFERENCE - Output Schema

Block 20 - TESTING - Creator Checklist

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