Extract & Classify Invoices & Receipts with Gmail, OpenAI and Google Drive — n8n Workflow

High complexity🔗 Webhook18 nodes🏷️ Invoice Processing👁 6,645 viewsby Tom

Overview

Who is it for? Anyone who wants to automatically aggregate their invoices or receipts. Main beneficiaries: small business owners and freelancers.

How it works Creates a folder in Google Drive for uploading invoices and receipts. Responds (Webhook response) with URL to the created folder. Gets all emails with attachments from a Gmail mailbox. (Optional) Filters emails, e.g. exclude emails sent to specific address. Filters only PDF attachments. Classifies all PDF attachment contents with an AI mo

Nodes used

Google DriveGmailCodeOpenAI

Workflow Preview

Gmail PDF Invoice/Receipt Classifier & Google
_DISCLAIMER: AI classification isn't perfect. Always do
Parameters
* `maxTokenSize` (Number)
* Limits PDF text length (estimated input tokens)
*
OpenAI
C
Configure
Iterate over email attac…
N
Not a PDF
I
Is text within token lim…
M
Merge
I
Is matched
Upload file to folder
⚡
W
Webhook
⚡
R
Respond to Webhook
Create folder
Aggregate attachments
S
Send email with invoices?
Send to my accountant
Get emails with attachme…
R
Read PDF email attachments
I
Is attachment a PDF?
O
Optional filter for emails
18 nodes18 edges

How it Works

  1. 1

    Trigger

    The workflow starts with a webhook trigger.

  2. 2

    Process

    Data flows through 18 nodes, connecting code, filter, gmail.

  3. 3

    Output

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

Node Details (18)

GO

Google Drive

googleDrive

#1
GM

Gmail

gmail

#2
CO

Code

code

#3
OP

OpenAI

n8n-nodes-langchain.openAi

#4

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 extract-classify-invoices-receipts-with-gmail-openai-and-google-drive 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": "Extract & Classify Invoices & Receipts with Gmail, OpenAI and Google Drive", "nodes": [...], ...}

Integrations

codefiltergmailgoogledriveifmergeopenaireadpdfrespondtowebhooksetwebhook

Get This Workflow

Download and import in one click

Download JSONView on n8n.io
Nodes18
Complexityhigh
Triggerwebhook
Views6,645
CategoryInvoice Processing

Created by

Tom

Tom

@devpeer-tom

Tags

codefiltergmailgoogledriveifmergeopenaireadpdfrespondtowebhookset
⚡

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Automate Custom QuickBooks Invoice PDFs & Email with n8n

Standard accounting templates often fail to reflect a premium brand identity. This sophisticated n8n workflow bridges the gap between financial record-keeping and professional client presentation. By moving beyond the native limitations of QuickBooks Online, this automation enables businesses to generate high-end, multi-page PDF invoices that align perfectly with their corporate styling. The process begins the moment a new invoice is generated in QuickBooks, triggering a webhook that captures real-time billing data. The workflow then utilizes advanced HTML-to-File conversion and custom Code nodes to structure data into a polished, branded layout. It handles complex logic such as line-item merging and multi-page formatting automatically. Once the document is rendered, the system bypasses generic 'no-reply' senders by routing the finalized PDF through your preferred email provider. This ensures a seamless, white-labeled experience for your clients while eliminating the manual overhead of exporting, styling, and attaching files. Ideal for agencies and service providers, this flow guarantees that your most frequent touchpoint—the bill—is as professional as your work. **Common Use Cases:** - High-end creative agencies requiring bespoke, white-labeled billing documents for premium clients. - Automated recurring subscription billing where custom tax disclosures or localized branding are required. - Service-based businesses needing to attach dynamic project reports or terms of service directly to QuickBooks invoices.

🔗 Webhook·12 nodes