Automatically sign PDFs from a watched Google Drive folder with PDF API Hub

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1. Workflow Overview

Auto E Sign PDF — Google Drive Watcher Automatically signs PDF documents the moment they land in a Google Drive folder — no manual steps needed. The signed output is routed to a Drive folder. How i...

Best for

Document Extraction automation workflows
intermediate n8n builders looking for reusable templates

Tools used

n8n-nodes-base.googledrivetrigger, n8n-nodes-base.googledrive, n8n-nodes-base.set, n8n-nodes-base.if, n8n-nodes-pdf-api-hub.pdfsplitmerge, n8n-nodes-base.stickynote

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Rishabh Dugar.

Original n8n.io source

1.1 Workflow description

Title: Automatically sign PDFs from a watched Google Drive folder with PDF API Hub
Workflow name: Automatically sign PDFs from a watched Google Drive folder with PDF API Hub

Auto E-Sign PDF — Google Drive Watcher

Automatically signs PDF documents the moment they land in a Google Drive folder — no manual steps needed. The signed output is routed to a Drive folder.

How it works

Google Drive Trigger watches a folder every minute for newly created files
Download file fetches the file from Drive into the workflow
Config sets your signature URL, position (x/y), and output method (drive or email)
Is PDF? filters out non-PDF files — only PDFs proceed
Sign a PDF overlays your signature image at the configured coordinates using PDF API Hub
Output Router sends the signed PDF to Drive
Log records the filename and signed status for auditing

Setup

Credentials

Google Drive OAuth2 (trigger + download + upload nodes)
PDF API Hub API key — sign up at pdfapihub.com

Configuration (in the Config node)

Field	Description
`signature_url`	Public URL to your PNG signature image
`sign_x` / `sign_y`	Pixel coordinates for signature placement
`output`	`drive` to save to Google Drive, `email` to send via email
`email`	Recipient address (required only if output = `email`)

Folder setup

Set your watch folder in the Google Drive Trigger node
Set your output folder in the Upload file node

Notes

Signature image should be a PNG with a transparent background for best results
Non-PDF files dropped into the watched folder are silently skipped

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 - Google Drive Trigger

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

Block 2 - Download file

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

Block 3 - Config

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

Block 4 - Is PDF?

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

Block 5 - Sign a PDF with a signature image

Type / Role: n8n-nodes-pdf-api-hub.pdfSplitMerge - pdfSplitMerge
Config choices: Version 1

Block 6 - Upload file

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

Block 7 - Log

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

Block 8 - Sticky Note - Folders

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

3. Summary Table

Workflow	Automatically sign PDFs from a watched Google Drive folder with PDF API Hub
Complexity	intermediate
Nodes	8
Categories	Document Extraction
Author	Rishabh Dugar
Published	12 Apr 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/14998/14998.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 Document Extraction workflows

Frequently asked questions

What does Automatically sign PDFs from a watched Google Drive folder with PDF API Hub 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 Document Extraction use case.

Rishabh Dugar

4 workflows

Nodes

n8n-nodes-base.googledrivetrigger n8n-nodes-base.googledrive n8n-nodes-base.set n8n-nodes-base.if n8n-nodes-pdf-api-hub.pdfsplitmerge n8n-nodes-base.stickynote

Complexity

intermediate

Published 12 Apr 2026

Likes 0

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Install path: /data/workflows/14998/14998.json

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Automatically sign PDFs from a watched Google Drive folder with PDF API Hub

Workflow preview

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Auto E-Sign PDF — Google Drive Watcher

How it works

Setup

Credentials

Configuration (in the Config node)

Folder setup

Notes

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Google Drive Trigger

Block 2 - Download file

Block 3 - Config

Block 4 - Is PDF?

Block 5 - Sign a PDF with a signature image

Block 6 - Upload file

Block 7 - Log

Block 8 - Sticky Note - Folders

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