Remove analytics campaign tags "utm_source" from the URL without redirecting to a new page, so visitors can bookmark or share the link without affecting the campaign count.

remove_utm.js

(function (l, h) {

    if ( typeof h.replaceState === 'undefined' ) {
        return;
    }
    
    if (!/[?&]utm_/ig.test(l.href)) {
        return;
    }

    var elems = ['source', 'medium', 'term', 'content', 'campaign'];
    var re = new RegExp('(^|&)utm_(' + elems.join('|') + ')=[^&]+', 'ig');
    var parts = l.href.split('?');
    parts[1] = parts[1].replace(re, '').replace(/^&/, '');

    if (!parts[1].length) {
        parts.pop();
    }

    h.replaceState(null, null, parts.join('?'));

})(location, history);