Take website screenshots of any resolution using phantomjs

screenshot.js

// Usage: phantomjs screenshot.js 1920x1080 site.domain.com
// outputs to site.domain.com-1920x1080.png
// dont add http to the URL

// If the page didnt render in time add a delay argument 
// e.g. 3000 for 3 seconds

var page = require('webpage').create();
var args = require('system').args;
var wh = args[1].split('x');
var pg = args[2];
page.viewportSize = { width: wh[0], height: wh[1] };
page.open('http://'+pg+'/', function () {
    window.setTimeout(function() {
        page.render(pg.replace('/','-') + '-'+args[1]+'.png');
        phantom.exit();
    }, args[3] || 500);
});