Fill PDF Forms via Webhook with PDFops + Gmail Email

Fill PDF forms automatically from a webhook—then email the completed PDF via Gmail

This n8n workflow receives a POST webhook with a PDF URL, form field values, and a recipient email address. It downloads the fillable PDF, fills it using PDFops, and sends the finished document as an attachment through Gmail.

What this workflow does

• Receives a webhook request containing pdfUrl, a fields object (AcroForm field mappings), and email.
• Downloads the blank fillable PDF from pdfUrl using an HTTP Request.
• Fills the PDF via PDFops by sending the PDF and the provided field mappings to PDFops.
• Sends an email with the filled PDF using a Gmail node, attaching the completed document to the recipient specified in the payload.

Use cases

• Customer onboarding: generate and email signed/filled paperwork from a SaaS form submission.
• Operations & compliance: automate sending filled agreements or forms to internal or external stakeholders.
• Lead capture: turn structured form data into a completed PDF and immediately email it to the prospect.
• API-driven document workflows: integrate PDF generation into your existing application using the production webhook URL.

Technical details

• n8n webhook (POST): accepts pdfUrl, fields, and email.
• HTTP Request: downloads the PDF from the provided URL.
• PDFops via n8n-nodes-pdfops community node: fills the form and outputs a new completed PDF.
• Gmail: emails the filled PDF attachment to the provided address.

Setup & customization

Activate the workflow, copy the Production Webhook URL, and submit the JSON payload. Add a Gmail credential to enable sending. Optionally add a PDFops API credential—the keyless tier works at 100 requests per IP per month. For best results, ensure your fields object uses the exact AcroForm field names. You can also swap Gmail for SMTP, Slack, or Google Drive, or use PDFops “Inspect Fields” to validate field names.