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Converting PDF to PNG in JPEG using free API:

<?php
$url = 'http://server.com/document.pdf';
$data = json_decode(file_get_contents('http://api.rest7.com/v1/pdf_to_image.php?url=' . $url . '&format=jpeg'));

if (@$data->success !== 1)
{
    die('Failed');
}
$image = file_get_contents($data->file);
file_put_contents('image.jpg', $image);