Process Telegram invoice OCR with OCR.space, OpenAI, Sheets and Drive

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1. Workflow Overview

Quick overview This workflow accepts invoice files via a Telegram bot, extracts text with OCR.space, uses OpenAI to turn the OCR output into structured invoice fields, appends the data to Google Sh...

Best for

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

Tools used

n8n-nodes-base.stickynote, n8n-nodes-base.set, n8n-nodes-base.telegramtrigger, n8n-nodes-base.telegram, n8n-nodes-base.code, n8n-nodes-base.switch, n8n-nodes-base.httprequest, @n8n/n8n-nodes-langchain.agent

Source and attribution

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

Original n8n.io source

1.1 Workflow description

Title: Process Telegram invoice OCR with OCR.space, OpenAI, Sheets and Drive
Workflow name: Process Telegram invoice OCR with OCR.space, OpenAI, Sheets and Drive

Quick overview

This workflow accepts invoice files via a Telegram bot, extracts text with OCR.space, uses OpenAI to turn the OCR output into structured invoice fields, appends the data to Google Sheets, archives the original file in Google Drive, and sends a confirmation message back to Telegram.

How it works

Triggers when a user sends an invoice image (JPG/PNG) or PDF to your Telegram bot.
Downloads the file from Telegram, detects its MIME type, and continues only for JPG, PNG, or PDF invoices.
Sends the invoice file to OCR.space to extract the raw text content.
Uses OpenAI to convert the OCR text into structured invoice JSON and validates the output against a predefined schema.
Formats item lines into newline-separated fields and appends the invoice details to a Google Sheets worksheet.
Uploads the original invoice file to a specified Google Drive folder and generates a short confirmation message with key details and your database link.
Sends the confirmation message back to the same Telegram chat.

Setup

Create a Telegram bot, add the Telegram credentials in n8n, and start a chat with the bot so it can receive messages.
Add an OCR.space API key using HTTP Header Auth credentials and connect it to the OCR request step.
Add OpenAI API credentials for the model used to extract structured invoice data and write the confirmation message.
Connect Google Sheets and Google Drive OAuth credentials, then set the Google Sheet ID and Drive folder ID in the workflow variables.
Create a Google Sheet (for example, “Sheet1”) with the required column headers used by the append step and update the sheet name if different.
Set the invoice database link in the workflow variables so it can be included in the Telegram confirmation.

Requirements

Telegram Bot (created via BotFather)
OpenAI API key
OCR.space API key (free tier available at ocr.space)
Google Sheets OAuth2 credentials
Google Drive OAuth2 credentials

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 Note 8c54e987

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

Block 2 - Sticky Note e29290ec

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

Block 3 - Configure Workflow Variables

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

Block 4 - Receive Invoice in Telegram

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

Block 5 - Download Telegram Invoice File

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

Block 6 - Detect File Type

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

Block 7 - Route Supported File Types

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

Block 8 - Extract Invoice Text with OCR.space

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

Block 9 - Extract Structured Invoice Data

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

Block 10 - OpenAI Chat Model

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

Block 11 - Validate Invoice JSON Output

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

Block 12 - Format Invoice Fields for Sheets

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

Block 13 - Save Invoice Data to Google Sheets

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

Block 14 - Merge Invoice Data with Original File

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

Block 15 - Upload Original Invoice to Google Drive

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

Block 16 - Prepare Confirmation Message Data

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

Block 17 - Write Telegram Confirmation Message

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

Block 18 - Send Confirmation to Telegram

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

Block 19 - Sticky Note

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

Block 20 - Sticky Note1

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

Block 21 - Sticky Note2

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

Block 22 - Sticky Note3

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

3. Summary Table

Workflow	Process Telegram invoice OCR with OCR.space, OpenAI, Sheets and Drive
Complexity	advanced
Nodes	22
Categories	Invoice Processing, AI Summarization
Author	ayo.o
Published	14 Jun 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/16350/16350.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 Process Telegram invoice OCR with OCR.space, OpenAI, Sheets and Drive 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.

ayo.o

3 workflows

Nodes

n8n-nodes-base.stickynote n8n-nodes-base.set n8n-nodes-base.telegramtrigger n8n-nodes-base.telegram n8n-nodes-base.code n8n-nodes-base.switch n8n-nodes-base.httprequest @n8n/n8n-nodes-langchain.agent

Complexity

advanced

Published 14 Jun 2026

Likes 0

View on n8n.io Download Workflow

Install path: /data/workflows/16350/16350.json

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Process Telegram invoice OCR with OCR.space, OpenAI, Sheets and Drive

Workflow preview

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Quick overview

How it works

Setup

Requirements

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Sticky Note 8c54e987

Block 2 - Sticky Note e29290ec

Block 3 - Configure Workflow Variables

Block 4 - Receive Invoice in Telegram

Block 5 - Download Telegram Invoice File

Block 6 - Detect File Type

Block 7 - Route Supported File Types

Block 8 - Extract Invoice Text with OCR.space

Block 9 - Extract Structured Invoice Data

Block 10 - OpenAI Chat Model

Block 11 - Validate Invoice JSON Output

Block 12 - Format Invoice Fields for Sheets

Block 13 - Save Invoice Data to Google Sheets

Block 14 - Merge Invoice Data with Original File

Block 15 - Upload Original Invoice to Google Drive

Block 16 - Prepare Confirmation Message Data

Block 17 - Write Telegram Confirmation Message

Block 18 - Send Confirmation to Telegram

Block 19 - Sticky Note

Block 20 - Sticky Note1

Block 21 - Sticky Note2

Block 22 - Sticky Note3

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