Your HTML and CSS
Print the markup your application already produces. No PDF-specific layout library, no second implementation of a document you have already built once.
HTML to PDF API
Turn production HTML into polished PDFs
Generate invoices, statements, reports and certificates from the HTML and CSS your application already renders. One request in, a finished document back, with the paper size, margins and repeating furniture you set.
Create a free accountRead the API docs
- Two credits per PDF
- Six paper formats
- Refunds on failed work
- UK-operated infrastructure
A4
Page 1 of 3
One request
You already built this document once
Most PDF libraries ask you to rebuild a layout you have already written in HTML and CSS, in a drawing API with its own units, fonts and box model. The invoice on screen and the invoice in the attachment then drift apart, and every change costs twice.
Renderwolf prints the markup you already have, in a real browser, with the paper size, margins, scale and repeating header and footer set per request. One template, two outputs, one place to change it.
POST /renderwolf/v1/pdf
Authorization: Bearer rw_live_...
{
"html": "<html>...your invoice...</html>",
"paper_format": "a4",
"print_background": true,
"margin": "18mm",
"footer_html": "<div>Page <span class=pageNumber>
</span> of <span class=totalPages></span></div>"
}Capabilities
Document controls, as request parameters
The print settings you would otherwise chase through a browser dialogue, set per request and identical every time.
Six paper formats
A3, A4, A5, Letter, Legal and Tabloid, portrait or landscape, with margins and a scale factor set per request.
Repeating headers and footers
Supply header and footer HTML and it appears on every page, which is where page numbers, logos and document references belong.
Backgrounds that survive printing
Turn on print backgrounds and your tints, panels and brand colours come through instead of being dropped the way a browser drops them.
Documents behind a login
The same headers, Authorization header and cookies as a screenshot request, so an authenticated statement prints as easily as a public page.
Direct binary response
The PDF comes back in the response. No job to poll, no bucket to read from, unless you want the asynchronous path for long documents.
Use cases
Documents worth generating rather than designing twice
Anywhere your application already renders the content and somebody needs it as a file.
Invoices and statements
Generate the document from the same template your billing screen renders, so the two can never drift apart.
Order confirmations
Attach a printable confirmation to the email your application already sends, produced from one request.
Reports and exports
Turn a dashboard or a report page into a document somebody can file, print or forward.
Certificates and passes
Personalise per recipient with variables, and composite a verified QR code into the layout.
Contracts and letters
Produce consistent, branded documents from HTML rather than from a word processor template nobody owns.
Printable dashboards
Print an authenticated view on a schedule so the weekly pack builds itself.
Pricing
Two credits per PDF, with failures refunded
Start with 250 free credits each month and no card required. Paid plans begin at £9 per month for 5,000 credits, shared across screenshots, PDFs, images and video. Cache hits cost nothing, failed work is refunded, and reaching a cap pauses rendering rather than billing overage.
Questions
Before you integrate
The details that decide whether this fits, without reading the whole reference first.
Can I send HTML directly instead of a URL?
Yes, and it is the common case. Send the HTML your application already renders and it is printed as-is, so the invoice template you maintain is the invoice the customer receives.
Which paper sizes are supported?
A3, A4, A5, Letter, Legal and Tabloid, in portrait or landscape, with margins and a scale factor you set per request.
Can I put a header and footer on every page?
Yes. Supply header and footer HTML and it repeats on each page, which is where page numbers, a logo or a document reference usually belong.
Why are my background colours missing?
Browsers do not print backgrounds by default. Turn print backgrounds on in the request and your CSS colours, tints and panels come through.
Does the page need to be public?
No. A PDF request takes the same custom headers, Authorization header and cookies as a screenshot, so a document behind a login prints the same way.
What does a PDF cost?
Two credits per PDF, against one for a screenshot. Failed work is refunded, cache hits cost nothing, and reaching a cap pauses rendering rather than billing overage.
Can I include a QR code in the document?
Yes. Send a qr object with a stored template render and each code is generated, verified and injected as a variable, so it is composited into the layout rather than fetched separately. QR generation costs no credits.
Generate your first document
Create an account, take a key and send your existing HTML. The first PDF is inside your free credits.
250 free credits each month, with no card required, hard usage caps and refunds on failed work.