Render a page to PDF using phantomjs 2.1

rasterize-letter-pdf.js

"use strict";
var page = require('webpage').create(),
    system = require('system'),
    address, output, size;

if (system.args.length !== 3) {
    console.log('Usage: rasterize.js URL filename [paperwidth*paperheight|paperformat] [zoom]');
    console.log('  paper (pdf output) examples: "5in*7.5in", "10cm*20cm", "A4", "Letter"');
    console.log('  image (png/jpg output) examples: "1920px" entire page, window width 1920px');
    console.log('                                   "800px*600px" window, clipped to 800x600');
    phantom.exit(1);
} else {
    address = system.args[1];
    output = system.args[2];
    page.viewportSize = { width: 816, height: 1056 };
    page.paperSize = {
        width: '8.5in', 
        height: '11in',
        margin: '0px'
    };


    page.open(address, function (status) {
        page.evaluate(function () {
            document.body.style.zoom = 0.75;
        });
        if (status !== 'success') {
            console.log('Unable to load the address!');
            phantom.exit(1);
        } else {
            window.setTimeout(function () {
                page.render(output);
                phantom.exit();
            }, 200);
        }
    });
}