Clicks on ads across Bing, Copilot, and Microsoft's partner networks get msclkid appended by auto-tagging. It is a 32-character hexadecimal token unique to the click.
On the advertiser's site, Microsoft's UET (Universal Event Tracking) tag picks it up, stores it in a first-party cookie, and sends conversion events back keyed to the click. Microsoft uses it for the advertiser's reports, for automated bidding, and for building remarketing audiences.
Is it safe to remove?
Yes. It is attribution-only. Pages render identically without it; only the advertiser's Microsoft dashboard is affected.
Remove msclkid automatically
Rather's Link Shortener strips msclkid and hundreds of parameters like it, right in the
address bar and in everything you copy or share. Free, open source, no account,
no data collection, and the page you are on never breaks: the cleanup happens
after the site has already loaded.
Microsoft's equivalent of gclid: a unique token added to every Bing ad click so the advertiser's site can report you back to Microsoft Advertising.
Is it safe to remove msclkid from a URL?
Yes. It is an attribution-only token and pages render identically without it.
How do I remove msclkid automatically?
The free, open-source browser extension Rather's Link Shortener removes msclkid automatically in the address bar, in copied links, and in shared links, on Chrome and Firefox. You can also simply delete the parameter by hand: everything from msclkid= up to the next & or the end of the URL.