Generate PDF from HTML

Generate a PDF document from HTML content or a public URL. Supports custom page sizes, fonts, margins, viewport dimensions, dynamic parameter substitution, and multiple output formats.

Rishabh Dugar@rishabhdugar

Install

openclaw skills install @rishabhdugar/generate-pdf

Generate PDF

What It Does

Generates a PDF document from either raw HTML content or a public URL using a headless Chromium browser. The API renders the page and returns the result as a downloadable URL, base64 string, or raw PDF file.

When to Use

Convert an HTML template (invoice, report, certificate) into a PDF
Take a PDF snapshot of a live webpage
Generate PDFs with dynamic data via placeholder substitution
Create PDFs with custom fonts, margins, and page sizes

Required Inputs

You must provide one of:

html_content — raw HTML string to render
url — a public URL to convert

Authentication

Send your API key in the CLIENT-API-KEY header.

Get your free API key at https://pdfapihub.com. Full API documentation is available at https://pdfapihub.com/docs.

Use Cases

Invoice Generation — Generate branded PDF invoices from HTML templates with dynamic customer data
Report Export — Convert dashboard or analytics HTML pages into downloadable PDF reports
Certificate Creation — Produce personalized certificates or diplomas with dynamic name/date substitution
Contract Generation — Create contracts from templates with client-specific details filled in
Resume/CV Export — Convert styled HTML resumes to PDF for download
Receipt Generation — Auto-generate PDF receipts for e-commerce transactions
Webpage Archival — Save a snapshot of any public webpage as a PDF for records

Key Options

Parameter	Description
`output_format`	`url` (default), `base64`, `file`/`pdf`/`binary`
`paper_size`	A4, A3, A5, Letter, Legal, Tabloid
`landscape`	`true` for landscape orientation
`margin`	Object with `top`, `right`, `bottom`, `left` (e.g. `"10mm"`)
`font`	Google Font names, pipe-separated
`dynamic_params`	Key-value object for `{{placeholder}}` replacement
`wait_till`	Seconds to wait before rendering (for JS-heavy pages)

Example Usage

bash

curl -X POST https://pdfapihub.com/api/v1/generatePdf \
  -H "CLIENT-API-KEY: your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "html_content": "<html><body><h1>Invoice #{{invoice_id}}</h1><p>Total: {{total}}</p></body></html>",
    "css_content": "body { font-family: Arial; }",
    "dynamic_params": { "invoice_id": "INV-001", "total": "$1,249.00" },
    "paper_size": "A4",
    "output_format": "url"
  }'

Notes

Boolean fields accept string values: "true", "1", "yes", "on"
Files are automatically deleted after 30 days
Page count limits are tier-dependent