What is the tuuid cookie?
Unique value to identify individual users.
Our October 2026 scan found it on 52 sites (2% of the 2,450 we scanned), set before any consent.
- Purpose
- Advertising
- Belongs to
- Platform161
- Set as
- Third-party (under another company's domain)
- Typical lifetime
- 12 months (vendor says: 13 months) — about what the vendor documents
Sites that set tuuid before consent
The highest-ranked 30 of 52 sites.
- amazon.com33 tracking companies
- datadoghq.com14 tracking companies
- globo.com24 tracking companies
- amazon.co.za32 tracking companies
- ivi.ru10 tracking companies
- livejournal.com11 tracking companies
- pikabu.ru6 tracking companies
- amazon.com.mx34 tracking companies
- instructure.com17 tracking companies
- terra.com.br23 tracking companies
Show 20 more sites
- gismeteo.ru14 tracking companies
- vnexpress.net14 tracking companies
- tenki.jp27 tracking companies
- oricon.co.jp36 tracking companies
- haberler.com14 tracking companies
- syosetu.com24 tracking companies
- 24h.com.vn20 tracking companies
- goodreturns.in25 tracking companies
- kakuyomu.jp18 tracking companies
- chordtela.com34 tracking companies
- rambler.ru9 tracking companies
- animanch.com22 tracking companies
- mirtesen.ru4 tracking companies
- politico.com31 tracking companies
- nielsen.com10 tracking companies
- hatena.ne.jp19 tracking companies
- hindustantimes.com36 tracking companies
- idnes.cz42 tracking companies
- asahi.com41 tracking companies
- ctvnews.ca38 tracking companies
Related cookies
Other cookies from Platform161.
- tuuid_lu44 sites
- custom_data22 sites
How to stop it
Declining non-essential cookies in a site's consent banner should stop tuuid 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.