April 21, 2026 6 min read

    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.

    → Get this n8n workflow template on n8n.io

    How it works

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

    Setup

    Credentials

    Configuration (in the Config node)

    FieldDescription
    signature_urlPublic URL to your PNG signature image
    sign_x / sign_yPixel coordinates for signature placement
    outputdrive to save to Google Drive, email to send via email
    emailRecipient 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

    API call used

    POST /api/v1/sign/pdf
{
  "url": "https://drive.google.com/...",
  "signature_url": "https://yoursite.com/signature.png",
  "sign_x": 350,
  "sign_y": 500,
  "output": "url"
}

    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
    • The workflow logs every processed file for audit trail purposes

    Next steps