What is the _cfuvid cookie?
The _cfuvid cookie is only set when a site uses this option in a Rate Limiting Rule, and is only used to allow the Cloudflare WAF to distinguish individual users who share the same IP address.
Our October 2026 scan found it on 156 sites (6% of the 2,450 we scanned), set before any consent.
- Purpose
- Functional
- Belongs to
- Cloudflare
- Set as
- First-party on 67% of sites, third-party on 33%
- Typical lifetime
- Session (vendor says: session)
Sites that set _cfuvid before consent
The highest-ranked 30 of 156 sites.
- openai.com1 tracking company
- discord.com2 tracking companies
- applovin.com8 tracking companies
- medium.com2 tracking companies
- canva.com1 tracking company
- hubspot.com1 tracking company
- doubleverify.com3 tracking companies
- hostgator.com3 tracking companies
- gitlab.com2 tracking companies
- calendly.com3 tracking companies
Show 20 more sites
- claude.ai0 tracking companies
- okta.com3 tracking companies
- mediatek.com7 tracking companies
- eventbrite.com2 tracking companies
- teamviewer.com1 tracking company
- doctolib.fr1 tracking company
- surveymonkey.com2 tracking companies
- anydesk.com2 tracking companies
- kick.com3 tracking companies
- curseforge.com9 tracking companies
- fiverr.com7 tracking companies
- apnews.com14 tracking companies
- chatgpt.site0 tracking companies
- life360.com2 tracking companies
- cloudinary.com5 tracking companies
- worldbank.org9 tracking companies
- readthedocs.io1 tracking company
- seedtag.com4 tracking companies
- trendyol.com2 tracking companies
- olx.com.br10 tracking companies
Related cookies
Other cookies from Cloudflare.
- __cf_bm719 sites
- cf_clearance226 sites
- __cflb26 sites
How to stop it
Declining non-essential cookies in a site's consent banner should stop _cfuvid 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.