DocFast API

Fast, reliable HTML/Markdown/URL to PDF conversion API. EU-hosted, GDPR compliant.

Website: https://docfast.dev Docs: https://docfast.dev/docs Status: https://docfast.dev/status

Features

• HTML → PDF — Full documents or fragments with optional CSS
• Markdown → PDF — GitHub-flavored Markdown with syntax highlighting
• URL → PDF — Render any public webpage as PDF (SSRF-protected)
• Invoice Templates — Built-in professional invoice template
• PDF Options — Paper size, orientation, margins, headers/footers, page ranges, scaling

Quick Start

1. Get an API Key

Sign up at https://docfast.dev — free demo available, Pro plan at €9/month for 5,000 PDFs.

2. Generate a PDF

curl -X POST https://docfast.dev/v1/convert/html \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"html": "<h1>Hello World</h1><p>Your first PDF.</p>"}' \
  -o output.pdf

API Endpoints

Convert HTML to PDF

curl -X POST https://docfast.dev/v1/convert/html \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"html": "<h1>Hello</h1>", "format": "A4", "margin": {"top": "20mm"}}' \
  -o output.pdf

Convert Markdown to PDF

curl -X POST https://docfast.dev/v1/convert/markdown \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"markdown": "# Hello\n\nWorld", "css": "body { font-family: sans-serif; }"}' \
  -o output.pdf

Convert URL to PDF

curl -X POST https://docfast.dev/v1/convert/url \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"url": "https://example.com", "format": "A4", "landscape": true}' \
  -o output.pdf

Invoice Template

curl -X POST https://docfast.dev/v1/templates/invoice/render \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "invoiceNumber": "INV-001",
    "date": "2026-02-14",
    "from": {"name": "Your Company", "email": "you@example.com"},
    "to": {"name": "Client", "email": "client@example.com"},
    "items": [{"description": "Consulting", "quantity": 10, "unitPrice": 150, "taxRate": 20}]
  }' \
  -o invoice.pdf

Demo (No Auth Required)

Try the API without signing up:

curl -X POST https://docfast.dev/v1/demo/html \
  -H "Content-Type: application/json" \
  -d '{"html": "<h1>Demo PDF</h1><p>No API key needed.</p>"}' \
  -o demo.pdf

Demo PDFs include a watermark and are rate-limited.

PDF Options

All conversion endpoints accept these options:

Option	Type	Default	Description
format	string	"A4"	Paper size: A4, Letter, Legal, A3, etc.
landscape	boolean	false	Landscape orientation
margin	object	{top:"0",right:"0",bottom:"0",left:"0"}	Margins in CSS units (px, mm, in, cm)
printBackground	boolean	true	Include background colors/images
filename	string	"document.pdf"	Suggested filename in Content-Disposition
css	string	—	Custom CSS (for HTML fragments and Markdown)
scale	number	1	Scale (0.1–2.0)
pageRanges	string	—	Page ranges, e.g. "1-3, 5"
width	string	—	Custom page width (overrides format)
height	string	—	Custom page height (overrides format)
headerTemplate	string	—	HTML template for page header
footerTemplate	string	—	HTML template for page footer
displayHeaderFooter	boolean	false	Show header/footer
preferCSSPageSize	boolean	false	Use CSS @page size over format

Authentication

Pass your API key via either:

• Authorization: Bearer <key> header
• X-API-Key: <key> header

Development

# Install dependencies
npm install

# Run in development mode
npm run dev

# Run tests
npm test

# Build
npm run build

# Start production server
npm start

Environment Variables

Variable	Required	Description
DATABASE_URL	Yes	PostgreSQL connection string
STRIPE_SECRET_KEY	Yes	Stripe API key for billing
STRIPE_WEBHOOK_SECRET	Yes	Stripe webhook signature secret
SMTP_HOST	Yes	SMTP server hostname
SMTP_PORT	Yes	SMTP server port
SMTP_USER	Yes	SMTP username
SMTP_PASS	Yes	SMTP password
BASE_URL	No	Base URL (default: https://docfast.dev)
PORT	No	Server port (default: 3100)
BROWSER_COUNT	No	Puppeteer browser instances (default: 2)
PAGES_PER_BROWSER	No	Pages per browser (default: 8)
LOG_LEVEL	No	Pino log level (default: info)

Architecture

• Runtime: Node.js + Express
• PDF Engine: Puppeteer (Chromium) with browser pool
• Database: PostgreSQL (via pg)
• Payments: Stripe
• Email: SMTP (nodemailer)

License

Proprietary — Cloonar Technologies GmbH