A JavaScript bookmarklet used to generate a QR code image of current URL.

to_qr.js

(function(doc) {
    var API = 'https://api.qrserver.com/v1/create-qr-code/?size=150x150&data=',
        img = doc.createElement('img');
    img.style.cssText = 'position:fixed;top:5px;right:5px;z-index:2147483647';
    img.src = API + encodeURI(location.href);
    img.onclick = function() {
        img.parentNode.removeChild(img)
    };
    doc.body.appendChild(img)
})(document)