Classify & Auto-Sort Invoices in Google Drive with GPT-4o — n8n Workflow

Medium complexity⚡ Trigger11 nodes🏷️ Invoice Processingby Rahul Joshi

Overview

Description:

Automatically classify invoices by industry (Retail, Manufacturing, or EdTech) using GPT-4o-powered AI parsing in this intelligent n8n automation template. Designed for teams managing high-volume billing data, this workflow fetches invoices from Google Drive, extracts PDF text, classifies each document using AI, and automatically moves files to the correct folder based on the predicted industry.

This smart auto-sorting system turns your invoice processing into a zero-touch AI work

Nodes used

Google DriveAI AgentAzure OpenAI Chat Model

Workflow Preview

Search files and folders (Google Drive)
Type: Google Drive node
Operation: Search for files and folders
What it does:
Searches for files in a specific Google Drive folder (I
Re
Download File (Google Drive)
Type: Google Drive node
Operation: Download
What it does:
Downloads each file found by the previous node
Uses the file ID from the search results (={{ $json.id
Extract from File (Extract from File)
Type: Extract from File node
Operation: PDF extraction
What it does:
Extracts text content from PDF files
Converts the downloaded PDF invoices into readable tex
Loop Over Items (Split in Batches)
Type: Split in Batches node
What it does:
Processes multiple files one by one in a loop
Ensures each invoice is processed individually
Manages batch processing of
AI Agent (LangChain Agent)
Type: LangChain AI Agent
What it does:
Analyzes the extracted text content from invoices
Uses a system prompt that instructs it to classify invo
Azure OpenAI Chat Model (Language Model)
Type: Azure OpenAI Chat Model
Model: GPT-4o-mini
What it does:
Provides the AI language model for the AI Agent
Connected to the AI Agent to power the classif
Switch (Conditional Logic)
Type: Switch node
What it does:
Routes the workflow based on AI classification results
Has three conditional branches:
If output equals "Retail" → Route to Retail folder
model
Download File
⚡
W
When clicking ‘Execute w…
AI Agent
Azure OpenAI Chat Model
L
Loop Over Items
E
Extract from File
S
Switch
Search files and folders
Manufacturing
Retail
EdTech
11 nodes13 edges

How it Works

  1. 1

    Trigger

    The workflow starts with a trigger trigger.

  2. 2

    Process

    Data flows through 11 nodes, connecting agent, extractfromfile, googledrive.

  3. 3

    Output

    The workflow completes its automation and delivers the result to the configured destination.

Node Details (11)

GO

Google Drive

googleDrive

#1
AI

AI Agent

n8n-nodes-langchain.agent

#2
AZ

Azure OpenAI Chat Model

n8n-nodes-langchain.lmChatAzureOpenAi

#3

How to Import This Workflow

  1. 1Click Download JSON button on the right to save the workflow file.
  2. 2Open your n8n instance. Go to Workflows → New → Import from file.
  3. 3Select the downloaded classify-auto-sort-invoices-in-google-drive-with-gpt-4o file and click Import.
  4. 4Set up credentials for each service node (API keys, OAuth, etc.).
  5. 5Click Test Workflow to verify everything works, then activate it.

Or paste directly in n8n → Import from JSON:

{ "name": "Classify & Auto-Sort Invoices in Google Drive with GPT-4o", "nodes": [...], ...}

Integrations

agentextractfromfilegoogledrivelmchatazureopenaimanualtriggersplitinbatchesswitch

Get This Workflow

Download and import in one click

Download JSONView on n8n.io
Nodes11
Complexitymedium
Triggertrigger
CategoryInvoice Processing

Created by

Rahul Joshi

Rahul Joshi

@rahul08

Tags

agentextractfromfilegoogledrivelmchatazureopenaimanualtriggersplitinbatchesswitch
⚡

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