What is the _conv_s cookie?

This cookie contains an ID string on the current session. This contains non-personal information on what subpages the visitor enters – this information is used to optimize the visitor's experience.

Our October 2026 scan found it on 8 sites (0% of the 2,450 we scanned), set before any consent.

Purpose: Functional
Belongs to: Convert Insights
Set as: First-party (under the site's own domain)
Typical lifetime: Under a day (vendor says: 1 day) — shorter than the vendor documents

Sites that set _conv_s before consent

The highest-ranked 8 of 8 sites.

dreamhost.com3 tracking companies
bugsnag.com2 tracking companies
discogs.com3 tracking companies
cloudinary.com5 tracking companies
revenuecat.com3 tracking companies
fool.com4 tracking companies
propublica.org5 tracking companies
reolink.com11 tracking companies

Related cookies

Other cookies from Convert Insights.

_conv_v8 sites

How to stop it

Declining non-essential cookies in a site's consent banner should stop _conv_s 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.