Generate invoice PDFs from HTML templates

Fill your HTML invoice template with the template engine you already use, then POST the result to /v1/weasyprint/render. The response is the invoice PDF.

1. Keep one invoice.html template in your code (Jinja2, ERB, Handlebars or another engine).
2. Render it with the invoice data into an HTML string.
3. Send the string to /v1/weasyprint/render and store or email the PDF.

<style>
  @page {
    size: A4;
    margin: 20mm;
    @bottom-center { content: "Page " counter(page) " of " counter(pages); font-size: 9pt; }
  }
  body { font-family: "DejaVu Sans", sans-serif; font-size: 10pt; }
  table { width: 100%; border-collapse: collapse; }
  th, td { padding: 6px 8px; border-bottom: 1px solid #ddd; text-align: left; }
  .num { text-align: right; }
  tr { break-inside: avoid; }
</style>
<h1>Invoice 2026-001</h1>
<table>
  <thead>
    <tr><th>Item</th><th class="num">Qty</th><th class="num">Price</th></tr>
  </thead>
  <tbody>
    <tr><td>Design work</td><td class="num">12 h</td><td class="num">1,200.00 €</td></tr>
  </tbody>
</table>
<p><strong>Total: 1,200.00 €</strong></p>

<thead> repeats the column headings on every page of a long table. break-inside: avoid keeps each row on one page.

Logo and fonts

The logo goes in as a data: URI (how). Fonts other than DejaVu load with @font-face (CSS support).

In production

The call returns when the PDF is ready. The time limit covers the whole render: 20 s with a key, 8 s without. With an API key, an invoice costs 1 credit, whatever its page count. The PDF carries no timestamps, so the same HTML gives the same file while the engine version stays the same. For an archive, a paid plan writes PDF/A-2b or PDF/A-3b (pdf_variant).

Next step

Paste your template into the free tool and check the layout.

FAQ

How do I keep the table headings on every page of a long invoice?

Put the heading row in a thead element. The renderer repeats it at the top of every page the table spans.

Can I include a company logo?

Yes, as a data: URI in the img element. The renderer loads no external URLs, so a remote image URL is rejected with status 400.