Extract invoice data from Gmail to Airtable with Mistral OCR and GPT-4.1-mini

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1. Workflow Overview

This n8n template demonstrates how to automatically process invoice attachments from email using OCR and AI. When an invoice is received in Gmail, the workflow extracts structured invoice data and ...

Best for

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

Tools used

@n8n/n8n-nodes-langchain.lmchatopenai, @n8n/n8n-nodes-langchain.outputparserstructured, n8n-nodes-base.gmailtrigger, n8n-nodes-base.if, n8n-nodes-base.noop, n8n-nodes-base.httprequest, n8n-nodes-base.mistralai, @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 Safa Khan.

Original n8n.io source

1.1 Workflow description

Title: Extract invoice data from Gmail to Airtable with Mistral OCR and GPT-4.1-mini
Workflow name: Extract invoice data from Gmail to Airtable with Mistral OCR and GPT-4.1-mini

This automation is useful for freelancers, agencies, and finance teams who receive invoices by email and want to maintain a structured invoice database without manual data entry.

Who’s it for

This workflow is designed for:

Freelancers managing client invoices

Agencies handling multiple invoice emails

Finance teams automating invoice intake

Automation consultants building accounting workflows

How it works

When a new email with an attachment arrives in Gmail, the workflow checks whether the subject contains the word “invoice”. The attachment is uploaded to an image-hosting service to generate a public URL.

The invoice file is then processed using OCR to extract text content. An AI agent analyzes the extracted text and converts it into structured invoice fields such as invoice number, sender, recipient, dates, description, and amount.

Before saving, Airtable is searched to ensure the invoice does not already exist. Valid invoices are stored automatically, while invalid data triggers an error notification email.

How to set up

Connect Gmail credentials and enable attachment download.
Connect Airtable credentials and create an invoice table.
Add your imgbb API key in the HTTP Request node.
Connect your OCR provider (Mistral).
Connect your OpenAI API credentials.
Activate the workflow and send a test invoice email.

Requirements

Gmail account
Airtable account
OpenAI API key
Mistral OCR API key
imgbb API key
n8n instance (cloud or self-hosted)

How to customize the workflow

You can customize this workflow by:

Modifying the AI prompt used for invoice extraction

Adding new invoice fields in Airtable

Changing validation rules

Supporting additional invoice formats (PDF, PNG, JPG)

Adding integrations with accounting tools like QuickBooks or Stripe

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 - OpenAI Chat Model

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

Block 2 - Structured Output Parser

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

Block 3 - Gmail Trigger

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

Block 4 - If

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

Block 5 - No Operation, do nothing

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

Block 6 - host image

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

Block 7 - Extract text

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

Block 8 - Download Invoice

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

Block 9 - Analyze Invoices

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 2.2

Block 10 - Search Existing Invoices

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

Block 11 - Check for Duplicates

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

Block 12 - Validate Data

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

Block 13 - Invalid Data Handler

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

Block 14 - Send Error Email

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

Block 15 - No Operation, do nothing1

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

Block 16 - upload invoice & details

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

Block 17 - Sticky Note

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

Block 18 - Sticky Note1

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

Block 19 - Sticky Note2

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

Block 20 - Sticky Note3

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

Block 21 - Sticky Note4

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

Block 22 - Sticky Note5

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

Block 23 - Sticky Note6

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

Block 24 - Sticky Note7

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

Showing the first 24 of 25 workflow blocks. Download the JSON for the full node graph.

3. Summary Table

Workflow	Extract invoice data from Gmail to Airtable with Mistral OCR and GPT-4.1-mini
Complexity	advanced
Nodes	25
Categories	Invoice Processing, AI Summarization
Author	Safa Khan
Published	17 Feb 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/13469/13469.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 from Gmail to Airtable with Mistral OCR and GPT-4.1-mini 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.

Safa Khan

3 workflows

Nodes

@n8n/n8n-nodes-langchain.lmchatopenai @n8n/n8n-nodes-langchain.outputparserstructured n8n-nodes-base.gmailtrigger n8n-nodes-base.if n8n-nodes-base.noop n8n-nodes-base.httprequest n8n-nodes-base.mistralai @n8n/n8n-nodes-langchain.agent

Complexity

advanced

Published 17 Feb 2026

Likes 0

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Install path: /data/workflows/13469/13469.json

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Extract invoice data from Gmail to Airtable with Mistral OCR and GPT-4.1-mini

Workflow preview

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Who’s it for

How it works

How to set up

Requirements

How to customize the workflow

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - OpenAI Chat Model

Block 2 - Structured Output Parser

Block 3 - Gmail Trigger

Block 4 - If

Block 5 - No Operation, do nothing

Block 6 - host image

Block 7 - Extract text

Block 8 - Download Invoice

Block 9 - Analyze Invoices

Block 10 - Search Existing Invoices

Block 11 - Check for Duplicates

Block 12 - Validate Data

Block 13 - Invalid Data Handler

Block 14 - Send Error Email

Block 15 - No Operation, do nothing1

Block 16 - upload invoice & details

Block 17 - Sticky Note

Block 18 - Sticky Note1

Block 19 - Sticky Note2

Block 20 - Sticky Note3

Block 21 - Sticky Note4

Block 22 - Sticky Note5

Block 23 - Sticky Note6

Block 24 - Sticky Note7

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