Extract purchase order data to Excel via Telegram using OCR and Google Gemini

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1. Workflow Overview

Quick Overview This workflow accepts purchase order PDFs or images via Telegram, extracts text using PDF parsing or Tesseract OCR, uses Google Gemini to convert the text into structured JSON, valid...

Best for

Document Extraction automation workflows
AI Summarization automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.telegramtrigger, n8n-nodes-base.code, n8n-nodes-base.telegram, n8n-nodes-base.set, n8n-nodes-base.switch, n8n-nodes-base.extractfromfile, n8n-nodes-tesseractjs.tesseractnode, n8n-nodes-base.if

Source and attribution

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

Original n8n.io source

1.1 Workflow description

Title: Extract purchase order data to Excel via Telegram using OCR and Google Gemini
Workflow name: Extract purchase order data to Excel via Telegram using OCR and Google Gemini

Quick Overview

This workflow accepts purchase order PDFs or images via Telegram, extracts text using PDF parsing or Tesseract OCR, uses Google Gemini to convert the text into structured JSON, validates key fields, and appends the results to a Microsoft Excel table in OneDrive, then notifies the sender.

How it works

Triggers when a new Telegram message arrives with a document or photo attachment.
Detects whether the attachment is a PDF or an image and immediately replies in Telegram that processing has started (or sends an invalid-file message if unsupported).
Downloads the file from Telegram and extracts text using built-in PDF text extraction for PDFs or Tesseract OCR for images.
Cleans the extracted text and sends it to Google Gemini with instructions to return purchase order fields and line items as valid JSON.
Parses the Gemini response into JSON and validates that the PO number exists and the total amount is numeric.
If valid, formats the data for a Microsoft Excel table, appends it to the selected workbook/table in OneDrive, and sends a success message in Telegram.
If invalid, sends a Telegram message listing the validation errors.

Setup

Connect your Telegram Bot credential and start a chat with the bot so it can receive PDFs/images and reply to your chat.
Add a Google Gemini (PaLM) API credential and ensure the model ID in the prompt node matches an available Gemini model in your account.
Connect Microsoft Excel OAuth2 credentials, then select the target OneDrive workbook, worksheet, and table where rows should be appended.
(Optional) Adjust the Gemini prompt fields, validation rules, and the Excel column mappings to match your purchase order format and table schema.

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 - Telegram Trigger

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

Block 2 - Detect File Type

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

Block 3 - Notifikasi file invalid

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

Block 4 - Mapping PDF

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

Block 5 - Mapping Image

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

Block 6 - Get Image

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

Block 7 - Get PDF

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

Block 8 - Notifikasi file sedang diproses

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

Block 9 - Clean PDF Text

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

Block 10 - Clean OCR Text

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

Block 11 - Route by File Type

Type / Role: n8n-nodes-base.switch - switch
Config choices: Version 3.3

Block 12 - Extract PDF Text

Type / Role: n8n-nodes-base.extractFromFile - extractFromFile
Config choices: Version 1.1

Block 13 - Prepare PDF Data

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

Block 14 - Extract Text from Image (OCR)

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

Block 15 - Prepare Image Data

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

Block 16 - Parse AI Response

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

Block 17 - Validate Extracted Data

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

Block 18 - Check Data Validity

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

Block 19 - Format Data for Excel

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

Block 20 - Save Data to Excel

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

Block 21 - Send Success Notification

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

Block 22 - Send Invalid Data Notification

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

Block 23 - Extract Structured Data (AI)

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

Block 24 - Sticky Note

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

Showing the first 24 of 31 workflow blocks. Download the JSON for the full node graph.

3. Summary Table

Workflow	Extract purchase order data to Excel via Telegram using OCR and Google Gemini
Complexity	advanced
Nodes	31
Categories	Document Extraction, AI Summarization
Author	Ramdoni
Published	08 Jun 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/16172/16172.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 Document Extraction workflows AI Summarization workflows

Frequently asked questions

What does Extract purchase order data to Excel via Telegram using OCR and Google Gemini 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 Document Extraction, AI Summarization use case.

Ramdoni

8 workflows

Nodes

n8n-nodes-base.telegramtrigger n8n-nodes-base.code n8n-nodes-base.telegram n8n-nodes-base.set n8n-nodes-base.switch n8n-nodes-base.extractfromfile n8n-nodes-tesseractjs.tesseractnode n8n-nodes-base.if

Complexity

advanced

Published 08 Jun 2026

Likes 0

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Install path: /data/workflows/16172/16172.json

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Extract purchase order data to Excel via Telegram using OCR and Google Gemini

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 - Telegram Trigger

Block 2 - Detect File Type

Block 3 - Notifikasi file invalid

Block 4 - Mapping PDF

Block 5 - Mapping Image

Block 6 - Get Image

Block 7 - Get PDF

Block 8 - Notifikasi file sedang diproses

Block 9 - Clean PDF Text

Block 10 - Clean OCR Text

Block 11 - Route by File Type

Block 12 - Extract PDF Text

Block 13 - Prepare PDF Data

Block 14 - Extract Text from Image (OCR)

Block 15 - Prepare Image Data

Block 16 - Parse AI Response

Block 17 - Validate Extracted Data

Block 18 - Check Data Validity

Block 19 - Format Data for Excel

Block 20 - Save Data to Excel

Block 21 - Send Success Notification

Block 22 - Send Invalid Data Notification

Block 23 - Extract Structured Data (AI)

Block 24 - Sticky Note

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