Extract structured data from Gmail attachments to Google Sheets, GPT vision

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1. Workflow Overview

Automatically extract structured information from emails using AI powered document analysis. This workflow processes emails from specified domains, classifies them by type, and extracts structured ...

Best for

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

Tools used

n8n-nodes-base.stickynote, n8n-nodes-base.scheduletrigger, n8n-nodes-base.gmail, n8n-nodes-base.code, n8n-nodes-base.filter, n8n-nodes-base.if, n8n-nodes-base.extractfromfile, n8n-nodes-base.httprequest

Source and attribution

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

Original n8n.io source

1.1 Workflow description

Title: Extract structured data from Gmail attachments to Google Sheets, GPT vision
Workflow name: Extract structured data from Gmail attachments to Google Sheets, GPT vision

Automatically extract structured information from emails using AI-powered document analysis. This workflow processes emails from specified domains, classifies them by type, and extracts structured data from various attachment formats.

Who is this for

Operations teams, coordinators, and business professionals who receive proposals or reports from multiple sources via email and need to consolidate the information into a structured database.

What this workflow does

Monitors Gmail every 30 minutes for emails from specified domains
Classifies emails into three categories based on customizable keywords
Processes attachments intelligently based on file type and email classification
Extracts structured data: dates, times, names, amounts, and other fields
Saves to Google Sheets with full metadata and classification
Labels processed emails in Gmail for tracking

Setup requirements

Gmail OAuth2 credentials
OpenAI API key (GPT-4 Vision)
Google Sheets OAuth2 credentials
AWS S3 bucket for temporary image storage
ConvertAPI account for PPTX/PDF conversion

How to customize

Edit the domain list and classification keywords in the code nodes to adapt for your specific use case.

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 - Workflow Description

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

Block 2 - Email Classification Info

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

Block 3 - Gmail Labels Info

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

Block 4 - File Processing Info

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

Block 5 - ConvertAPI Info

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

Block 6 - Google Sheets Info

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

Block 7 - AWS S3 Info

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

Block 8 - Schedule Trigger

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

Block 9 - Gmail - Get Emails

Type / Role: n8n-nodes-base.gmail - gmail
Config choices: Version 2.1

Block 10 - Domain Filter

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

Block 11 - Filter Valid Emails

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

Block 12 - Gmail - Get Attachments

Type / Role: n8n-nodes-base.gmail - gmail
Config choices: Version 2.1

Block 13 - Detect File Types

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

Block 14 - IF - Has Excel?

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

Block 15 - Extract from Excel

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

Block 16 - Parse Excel Data

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

Block 17 - IF - Has PPTX/PDF?

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

Block 18 - ConvertAPI to PNG

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

Block 19 - Prepare for S3 Upload

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

Block 20 - S3 Upload (PPTX)

Type / Role: n8n-nodes-base.awsS3 - awsS3
Config choices: Version 2

Block 21 - Collect S3 URLs

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

Block 22 - Prepare GPT Request (PPTX)

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

Block 23 - GPT Vision Analysis

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

Block 24 - IF - Has Image?

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

Showing the first 24 of 48 workflow blocks. Download the JSON for the full node graph.

3. Summary Table

Workflow	Extract structured data from Gmail attachments to Google Sheets, GPT vision
Complexity	advanced
Nodes	48
Categories	Document Extraction, AI Summarization
Author	Masaki Go
Published	26 Jan 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/13004/13004.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 structured data from Gmail attachments to Google Sheets, GPT vision 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.

Masaki Go

8 workflows

Nodes

n8n-nodes-base.stickynote n8n-nodes-base.scheduletrigger n8n-nodes-base.gmail n8n-nodes-base.code n8n-nodes-base.filter n8n-nodes-base.if n8n-nodes-base.extractfromfile n8n-nodes-base.httprequest

Complexity

advanced

Published 26 Jan 2026

Likes 0

View on n8n.io Download Workflow

Install path: /data/workflows/13004/13004.json

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Extract structured data from Gmail attachments to Google Sheets, GPT vision

Workflow preview

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Who is this for

What this workflow does

Setup requirements

How to customize

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Workflow Description

Block 2 - Email Classification Info

Block 3 - Gmail Labels Info

Block 4 - File Processing Info

Block 5 - ConvertAPI Info

Block 6 - Google Sheets Info

Block 7 - AWS S3 Info

Block 8 - Schedule Trigger

Block 9 - Gmail - Get Emails

Block 10 - Domain Filter

Block 11 - Filter Valid Emails

Block 12 - Gmail - Get Attachments

Block 13 - Detect File Types

Block 14 - IF - Has Excel?

Block 15 - Extract from Excel

Block 16 - Parse Excel Data

Block 17 - IF - Has PPTX/PDF?

Block 18 - ConvertAPI to PNG

Block 19 - Prepare for S3 Upload

Block 20 - S3 Upload (PPTX)

Block 21 - Collect S3 URLs

Block 22 - Prepare GPT Request (PPTX)

Block 23 - GPT Vision Analysis

Block 24 - IF - Has Image?

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