Conversion from DOCX to PDF example. Conversion result will be saved as local file. Replace XXXXXXXX with your API secret.

ConvertAPI_convert_and_save.php

<?php

$curl = curl_init();
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_HTTPHEADER, array('Accept: application/octet-stream'));
curl_setopt($curl, CURLOPT_URL, "https://v2.convertapi.com/docx/to/pdf?secret=XXXXXXXXXXXX");
curl_setopt($curl, CURLOPT_POSTFIELDS, array('file' => new CurlFile('C:\my_file.docx')));
file_put_contents("result.pdf", curl_exec($curl));

?>