OCR document processing from LINE/Gmail using GPT-4o to Google Workspace

by SOLOVIEVA ANNA ✓ · 126 views · created 2025-12-02 · Document Extraction, AI Summarization

What this workflow does

This AI workflow has 17 nodes and runs when an HTTP POST request hits its webhook URL (plus 1 other trigger). Along the way it connects Gmail, Google Drive, Google Sheets and OpenAI.

How it runs

Trigger: When an HTTP POST request hits its webhook URL (plus 1 other trigger).

1. Workflow Configuration (Edit Fields (Set)): sets 2 fields: lineChannelAccessToken, googleDriveFolderId
2. Tag Source - EMAIL (Edit Fields (Set)): sets 2 fields: source, googleDriveFolderId
3. If: checks a condition and branches into true / false
4. Code: runs custom JavaScript code
5. HTTP Request: calls an HTTP API
6. Merge: merges the data from its input branches
7. Tag Source - LINE (Edit Fields (Set)): sets 1 field: source
8. Upload to Google Drive (Google Drive): uses Google Drive
9. Convert to Base (Code): runs custom JavaScript code
10. HTTP Request: calls an HTTP API

…plus 5 more steps. See the full node list below.

Services it uses

GmailGoogle DriveGoogle SheetsOpenAI

Before you upgrade to n8n 3.0

Nodes used (12)

• Webhookn8n-nodes-base.webhook
• Gmail Triggern8n-nodes-base.gmailTrigger
• Edit Fields (Set)n8n-nodes-base.set
• Mergen8n-nodes-base.merge
• Google Driven8n-nodes-base.googleDrive
• Coden8n-nodes-base.code
• Gmailn8n-nodes-base.gmail
• Ifn8n-nodes-base.if
• Google Sheetsn8n-nodes-base.googleSheets
• HTTP Requestn8n-nodes-base.httpRequest
• OpenAI@n8n/n8n-nodes-langchain.openAi
• Waitn8n-nodes-base.wait

From the author

Who this is for Users who frequently receive images or documents via LINE or email Teams needing automatic OCR + AI summarization Anyone who wants hands-free document processing and structured storage How it works Triggers: LINE Webhook and Gmail IMAP Trigger…

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