Automate PDF E-Signing with Google Drive & n8n Workflow

Transform your document workflow with this powerful n8n automation that automatically e-signs PDF documents the moment they're uploaded to Google Drive. No manual intervention required—just drop PDFs into your designated folder and receive professionally signed documents instantly.

What this workflow does

This intelligent automation monitors your Google Drive folder every minute, detecting new PDF uploads and processing them automatically. When a PDF arrives, the workflow downloads the file, verifies it's a PDF format, then overlays your signature image at pre-configured coordinates using PDF API Hub. The signed document is automatically saved to your designated Google Drive output folder, with complete audit logging for tracking purposes.

The workflow includes smart filtering to process only PDF files, ignoring other document types. Your signature positioning, output method, and recipient settings are fully customizable through the built-in configuration node.

Use cases

• Contract automation: Automatically sign service agreements, NDAs, and client contracts as they arrive
• Invoice processing: Sign vendor invoices and purchase orders for accounts payable workflows
• Document approval: Streamline approval processes for HR documents, policy updates, and compliance forms
• Client onboarding: Auto-sign welcome packets and service documentation for new customers
• Legal workflows: Process routine legal documents that require standard signatures

Technical details

This workflow leverages Google Drive Trigger for real-time file monitoring, Google Drive nodes for file management, and PDF API Hub for professional e-signing capabilities. The automation includes conditional logic nodes (if), configuration management (set), and comprehensive logging functionality.

Required integrations: Google Drive OAuth2 authentication and PDF API Hub API key. Setup involves configuring your signature image URL (PNG with transparent background recommended), setting X/Y coordinates for signature placement, and designating watch and output folders in Google Drive.

Perfect for businesses seeking to eliminate manual PDF signing bottlenecks while maintaining professional document standards and audit trails.