Rendering pages is not limited to images; we can also save the rendered page as a PDF document. If we state that the rendering file extension is .pdf, it will save the page as a PDF document; however, it will not automatically create multiple page documents if the page is too large. We need to set the paper properties to make a multipage PDF.
The WebPage object has a paperSize property that we can set before rendering the page to PDF. Let us say, we want to capture the page as PDF with an A4 paper size.
var system = require('system');
var url = system.args[1];
var saveas = system.args[2];
var page = require('webpage').create();
page.open(url, function(status) {
if ( status === "success" ) {
console.log('Saving screenshot as ' + saveas);
page.paperSize = { format: 'A4', orientation: 'portrait', border: '1cm' };
page.render('screenshot.' + saveas);
phantom.exit(0);
...