Free convert HTML to PDF

$PDFContent = "page HTML CONTENT";

//API URL
$url = 'http://freehtmltopdf.com';

//API PARAMS
$data = array('convert' => '',
          'html' => $PDFContent,
          'baseurl' => base_url(),
          'width' => '210mm',
          'enablejs' => 0,
          'orientation' => 'portrait');

// use key 'http' even if you send the request to https://...
$options = array('http' => array('header'  => "Content-type: application/x-www-form-urlencoded\r\n",
                 'method'  => 'POST',
                 'content' => http_build_query($data)),);
//PREPARE OPTIONS VARIABLE
$context  = stream_context_create($options);

//GET PDF CONTENT
$result = file_get_contents($url, false, $context);

// set the pdf data as download content:
header('Content-type: application/pdf');

//OPEN PDF FILE IN YOUR BROWSER
echo $result;