# PDF signing API with certificate generation via n8n and node-forge
This automation template enables a secure, self-contained document signing system via HTTP API, eliminating reliance on external e-signature providers. It´s designed for companies, developers, and legal departments needing programmatic PDF signing using their own cryptographic keys.
## Who it´s for
- Companies requiring electronic signatures without third-party e-signature providers.
- Developers integrating digital signing capabilities into internal systems or APIs.
- Legal and compliance teams automating contract, invoice, and agreement processing.
## What the automation does
- Accepts POST requests to upload PDFs, generate PFX certificates, or sign documents.
- Validates input parameters and operation type (key generation, signing, etc.).
- Stores temporary files on disk via the File System node.
- Performs cryptographic operations using node-forge and @signpdf libraries.
- Returns signed PDFs via a secure GET endpoint for download.
## What´s included
- Ready-to-use n8n workflow.
- Logic for handling HTTP triggers (webhooks) and API requests.
- Integrations with Webhook and File System as specified in the stack.
- Basic textual instructions for setup and adaptation.
## Requirements for setup
- An n8n instance (self-hosted or cloud).
- Access to the server or container’s file system for temporary file storage.
- Basic understanding of HTTP APIs, JSON, and environment variables.
## Benefits and outcomes
- Full autonomy — no dependency on external e-signature SaaS platforms.
- Secure key management within an isolated workflow environment.
- Seamless integration into existing systems via API calls.
- Reduced manual effort in document processing.
- Enhanced data compliance through local document handling.
## Important: template only
Important: you are purchasing a ready-made automation workflow template only. Rollout into your infrastructure, connecting specific accounts and services, 1:1 setup help, custom adjustments for non-standard stacks and any consulting support are provided as a separate paid service at an individual rate. To discuss custom work or 1:1 help, contact via chat
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