What is the uids cookie?
Registers user behaviour and navigation on the website, and any interaction with active campaigns. This is used for optimizing advertisement and for efficient retargeting.
Our October 2026 scan found it on 5 sites (0% of the 2,450 we scanned), set before any consent.
- Purpose
- Advertising
- Belongs to
- Admatic
- Set as
- Third-party (under another company's domain)
- Typical lifetime
- 3 months (vendor says: 3 months) — about what the vendor documents
Sites that set uids before consent
The highest-ranked 5 of 5 sites.
- techcrunch.com38 tracking companies
- chordtela.com34 tracking companies
- az24.vn22 tracking companies
- atlasobscura.com28 tracking companies
- eleconomista.es24 tracking companies
How to stop it
Declining non-essential cookies in a site's consent banner should stop uids being set on later visits. Blocking third-party cookies in your browser settings stops the third-party kind everywhere, and clearing cookies for a site removes any it already set.
Description from the Open Cookie Database (Apache 2.0).
Understanding this page
- How cookie lifetimes work, and why a 13-month _ga matters
What a cookie's "expires" field actually controls, why Google Analytics ships a 2-year default that many sites cut down to 13 months, and how Safari's 7-day cap on script-set cookies changes the picture.
- First-party vs third-party cookies (and why "first-party" still tracks you)
What the distinction actually means technically, why browsers only block one of the two, and how CNAME cloaking, server-side tagging and cookies like _ga let sites keep tracking under their own domain.
- How to block or limit trackers
Browser privacy settings, content blockers, Global Privacy Control and clearing cookies compared honestly — what each one actually stops, what it doesn't, and what it costs you in return.