How to Convert HTML to PDF With an API

Generating PDFs is one of those tasks every product eventually needs — invoices, receipts, reports, contracts, tickets. Running a headless browser yourself is painful to maintain. An HTML-to-PDF API removes that burden entirely.

Why use an API instead of a library

• No infrastructure — no Chromium binaries, no font packages, no memory tuning
• Consistent rendering — the same output on every platform
• Scales instantly — generate one PDF or ten thousand without managing workers

Convert HTML to PDF

Send your HTML to the endpoint and get a PDF back:

curl -X POST "https://pdf-generation-by-helix-api.p.rapidapi.com/from-html" \
  -H "X-RapidAPI-Key: YOUR_KEY" \
  -H "X-RapidAPI-Host: pdf-generation-by-helix-api.p.rapidapi.com" \
  -H "Content-Type: application/json" \
  -d '{"html":"<h1>Invoice #1024</h1><p>Total: $250.00</p>"}' \
  --output invoice.pdf

The API also accepts Markdown (/from-markdown) and full URLs (/from-url) — useful when you already have a styled page you want captured as a document.

Tips for clean PDFs

• Inline your CSS, or pass it in the css field
• Use print-friendly units (pt, cm) and @page rules for margins
• Keep layouts simple — tables and flexbox render reliably

Real-world uses

Invoices and receipts, exportable analytics reports, certificates, packing slips, and contract generation. Pair it with the Email Sending API to generate and deliver documents in one flow.

Try the PDF Generation API live, then browse the full API catalog.