HTML to PDF API

POST your HTML or a public URL to https://render.cuelark.com/v1/pdf and get back a PDF printed by real Chromium, with your CSS, fonts and page size.

HTML

Page size

Landscape

PDFs are printed by Chromium on Cloudflare and streamed back. Nothing is stored. Free: 10 PDF or screenshot renders a day per IP.

Request

bash

curl -X POST https://render.cuelark.com/v1/pdf \
  -H "content-type: application/json" \
  -d '{"html":"<h1>Invoice #1042</h1><p>Total: $1,250.00</p>","format":"letter","margin":"0.5in"}' \
  -o invoice.pdf

From JavaScript

const res = await fetch("https://render.cuelark.com/v1/pdf", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({ url: "https://example.com", format: "a4" }),
});
const pdf = await res.arrayBuffer();

Options

Field	Values	Default
html or url	HTML up to 2 MB, or a public http(s) URL	-
format	letter, legal, tabloid, a3, a4, a5	letter
landscape	true / false	false
margin	e.g. 0.5in, 12mm, 24px	0.5in
background	print CSS backgrounds	true
cssPageSize	use your @page size	false
javascript	false to disable scripts	true
filename	download name	render

Limits and safety

Free without a key: 10 PDF or screenshot renders per day per IP. Free API keys with 100 a month are coming with Cuelark accounts.
Pages get 15 seconds to load. Output is capped at 12 MB.
Private IP ranges, internal hostnames and cloud metadata addresses are blocked, also for requests made from inside your HTML.
Your HTML and the PDF aren't stored or logged.

Frequently asked questions

Does it support CSS and web fonts?

Yes. It's real Chromium, so Flexbox, Grid, @font-face, Google Fonts and print CSS like @page and break-before all work.

Letter or A4 by default?

US Letter by default. Pass "format":"a4" for A4.

Can I call it from n8n?

Yes. Use an HTTP Request node: POST, JSON body, response format File. The PDF comes back as binary data.

How do I add page breaks?

Add style="break-before: page" (or page-break-before: always) to the element that should start a new page.

Related free tools from Cuelark

Updated November 10, 2026 by the Cuelark Team.