PDF

The PDF file generator accepts an object containing an HTML string, and uses Pdfcrowd to render it as a PDF document. Pdfcrowd employs the Chromium Embedded Framework for HTML rendering, which uses the same foundation as Google Chrome. This allows Mechanic to generate PDFs with modern CSS and JavaScript features, including chart libraries and web fonts.

Options

Option	Description
html	Required; a string containing the HTML, CSS and JavaScript to be rendered
...	Additional Pdfcrowd API options supported; see below

{
  "pdf": {
    "html": HTML,
    ...
  }
}

Pdfcrowd options

The PDF generator supports all rendering-related options of the Pdfcrowd API, using version 20.10.

For a complete list of options, see https://pdfcrowd.com/doc/api/html-to-pdf/http/.

Debugging

If it's unclear why something isn't rendering properly, start by testing the HTML being used in a Pdfcrowd playground, at https://pdfcrowd.com/playground/html-to-pdf. If the issue is reproducible in the playground, use the "Help" button along the left-hand sidebar to get the ID of your specific playground, and instructions for contacting Pdfcrowd support with the details of your test.

A screencast illustrating an HTML test, and a path for reaching Pdfcrowd support

Example

Liquid

{% capture html %}
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=Liu+Jian+Mao+Cao&display=swap" rel="stylesheet">
<style>p { font-family: 'Liu Jian Mao Cao', cursive; }</style>

<p>Almost before we knew it, we had left the ground.</p>
<div id="tester" style="width:100%;height:40vh;"></div>

<script src="https://cdn.plot.ly/plotly-2.2.0.min.js"></script>
<script>
  // from https://plotly.com/javascript/getting-started/
  TESTER = document.getElementById('tester');
	Plotly.newPlot( TESTER, [{
	x: [1, 2, 3, 4, 5],
	y: [1, 2, 4, 8, 16] }], {
	margin: { t: 0 } } );
</script>
{% endcapture %}

{% action "files" %}
  {
    "file.pdf": {
      "pdf": {
        "html": {{ html | json }},
        "page_width": "7in",
        "page_height": "5in",
        "margin_top": "10mm",
        "margin_right": "10mm",
        "margin_bottom": "10mm",
        "margin_left": "10mm"
      }
    }
  }
{% endaction %}

JSON

{
  "action": {
    "type": "files",
    "options": {
      "file.pdf": {
        "pdf": {
          "html": "\n<link rel=\"preconnect\" href=\"https://fonts.googleapis.com\">\n<link rel=\"preconnect\" href=\"https://fonts.gstatic.com\" crossorigin>\n<link href=\"https://fonts.googleapis.com/css2?family=Liu+Jian+Mao+Cao&display=swap\" rel=\"stylesheet\">\n<style>p { font-family: 'Liu Jian Mao Cao', cursive; }</style>\n\n<p>Almost before we knew it, we had left the ground.</p>\n<div id=\"tester\" style=\"width:100%;height:40vh;\"></div>\n\n<script src=\"https://cdn.plot.ly/plotly-2.2.0.min.js\"></script>\n<script>\n  // from https://plotly.com/javascript/getting-started/\n  TESTER = document.getElementById('tester');\n\tPlotly.newPlot( TESTER, [{\n\tx: [1, 2, 3, 4, 5],\n\ty: [1, 2, 4, 8, 16] }], {\n\tmargin: { t: 0 } } );\n</script>\n",
          "page_width": "7in",
          "page_height": "5in",
          "margin_top": "10mm",
          "margin_right": "10mm",
          "margin_bottom": "10mm",
          "margin_left": "10mm"
        }
      }
    }
  }
}