DocGen API

Document Generation API

Document Generation API is a comprehensive document automation platform that enables developers to create, render, customize, and manage professional documents entirely through REST APIs.

Whether you're generating invoices, contracts, reports, certificates, shipping labels, marketing materials, legal documents, or business forms, this API provides all the tools needed to automate document workflows.

The API supports rendering documents from HTML, Markdown, and reusable Jinja2 templates, producing high-quality PDF, PNG, and JPG outputs with configurable page layouts, margins, headers, footers, and page numbering. It also includes powerful PDF utilities such as merging multiple PDFs, filling interactive AcroForms, applying AES-256 password protection, and stamping watermarks across documents.

For teams building scalable document workflows, the API includes a complete template management system with versioning, preview capabilities, rendering, updates, and deletion, allowing developers to build once and generate unlimited documents using dynamic data.

Built with a stateless architecture and optimized for production environments, Document Generation API is ideal for SaaS platforms, enterprise applications, CRM systems, ERP software, HR systems, finance platforms, healthcare applications, legal technology, and automation workflows.

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Features

Document Rendering

• Render HTML to PDF
• Render HTML to PNG
• Render HTML to JPG
• Render Markdown to PDF
• Render Markdown to PNG
• Render Markdown to JPG
• Custom page layouts
• Custom page margins
• Portrait and landscape orientation
• Headers and footers
• Page numbering
• Render individual document pages

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Template Engine

• Create reusable templates
• Versioned templates
• Jinja2 template engine
• Render templates with JSON data
• Preview templates
• Update templates
• Delete templates
• List templates
• Retrieve template details

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PDF Utilities

• Merge multiple PDF files
• Fill interactive PDF forms (AcroForms)
• Flatten filled forms
• Add text watermarks
• AES-256 PDF encryption
• Owner password protection
• User password protection

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General

• REST API
• API Key authentication
• Stateless architecture
• High performance
• Production-ready
• Lightweight JSON requests
• Cloud-native
• Easy integration

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Output Formats

Format	Description
PDF	High-quality printable documents
PNG	Raster image output
JPG	JPEG image output

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API Endpoints

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System Information

Get Current Limits

GET

/meta/limits

Returns supported rendering engines, output formats, and service limitations.

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HTML Rendering

Render HTML

POST

/render/html

Render HTML into PDF, PNG, or JPG.

Features

• HTML rendering
• Print-ready output
• Page size selection
• Margins
• Headers
• Footers
• Page numbers
• Orientation control
• Render specific pages

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Markdown Rendering

Render Markdown

POST

/render/markdown

Convert Markdown into professionally formatted PDF or image documents.

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Template Rendering

Render Template

POST

/render/template/{template_id}

Render a stored Jinja2 template using dynamic JSON data.

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Template Preview

Preview Template

POST

/templates/{template_id}/preview

Render a template using sample data before production use.

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Template Management

Create Template

POST

/templates

Store a reusable template.

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List Templates

GET

/templates

Retrieve paginated template listings.

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Get Template

GET

/templates/{template_id}

Retrieve template source, page configuration, and version history.

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Update Template

PUT

/templates/{template_id}

Update template source or page settings.

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Delete Template

DELETE

/templates/{template_id}

Remove a stored template.

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PDF Form Filling

Fill PDF Form

POST

/pdf/forms/fill

Populate interactive PDF form fields from JSON data.

Optional form flattening converts fields into permanent, non-editable content.

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Merge PDF Files

Merge PDFs

POST

/pdf/merge

Combine multiple PDF files into a single document.

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Protect PDF

Encrypt PDF

POST

/pdf/protect

Encrypt PDF documents using AES-256 encryption.

Supports:

• Owner password
• User password
• Secure document distribution

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Watermark PDF

Add Watermark

POST

/pdf/watermark

Apply a translucent text watermark across every page.

Configurable opacity and custom watermark text.

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Rendering Options

The rendering endpoints support professional print configuration.

Page Size

Examples

• A4
• A3
• Letter
• Legal
• Custom sizes

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Orientation

• Portrait
• Landscape

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Margins

Configure:

• Top
• Right
• Bottom
• Left

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Headers

Add custom text headers to every page.

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Footers

Add custom text footers.

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Page Numbers

Enable automatic page numbering.

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Authentication

Every request requires an API Key.

Include the following header:

x-service-api-key: YOUR_API_KEY

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Example Requests

Render HTML

POST /render/html

Render Markdown

POST /render/markdown

Render Template

POST /render/template/tpl_ab12cd34ef56

Merge PDFs

POST /pdf/merge

Fill Form

POST /pdf/forms/fill

Protect PDF

POST /pdf/protect

Watermark PDF

POST /pdf/watermark

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Example Responses

HTML Render

{
  "success": true,
  "format": "pdf",
  "download_url": "https://..."
}

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Template Render

{
  "template_id": "tpl_ab12cd34ef56",
  "version": 3,
  "format": "pdf",
  "download_url": "https://..."
}

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Merge

{
  "merged": true,
  "pages": 28,
  "download_url": "https://..."
}

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Form Fill

{
  "filled": true,
  "flattened": true,
  "download_url": "https://..."
}

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Protect

{
  "encrypted": true,
  "algorithm": "AES-256"
}

Common Use Cases

Perfect for:

• Invoice generation
• Contracts
• Reports
• Certificates
• Purchase orders
• Shipping labels
• Quotes
• Business proposals
• Financial statements
• Tax documents
• HR documents
• Employment agreements
• Healthcare forms
• Insurance documents
• Legal paperwork
• Marketing brochures
• Product catalogs
• Event tickets
• Boarding passes
• Membership cards
• Educational certificates
• CRM systems
• ERP software
• SaaS platforms
• Workflow automation
• No-code platforms
• Internal business tools

Performance

• High-performance rendering engine
• Low-latency document generation
• Stateless architecture
• Cloud-native deployment
• Horizontally scalable
• Production-ready
• Optimized for large workloads
• Reliable document processing

Best Practices

• Store reusable layouts as templates instead of sending HTML repeatedly.
• Use Markdown for simple reports and documentation.
• Use HTML when advanced layouts or CSS styling are required.
• Protect confidential PDFs with AES-256 encryption before distribution.
• Flatten completed PDF forms to prevent further editing.
• Apply watermarks to drafts, confidential documents, and internal reports.
• Preview templates before deploying them to production.
• Version templates to safely manage updates without affecting existing workflows.

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SDK Compatibility

Compatible with every HTTP client and programming language, including:

• JavaScript
• TypeScript
• Python
• Go
• Java
• C#
• PHP
• Ruby
• Rust
• Swift
• Kotlin
• Dart
• Node.js
• cURL