FewCookies

Cookie glossary · Marketing

What is the id5 cookie?

ID5 cookie storing a shared universal ID used for user identification and audience matching in programmatic advertising. It is set by ID5 and classified as "Marketing". Requires consent.

At a glance

Provider ID5
Category Marketing
Consent required? Yes
Typical domain .id5-sync.com

How FewCookies handles this cookie

FewCookies recognises id5 from our database of 1,300+ known cookies and classifies it automatically as "Marketing". The free check tells you whether this cookie is detected on your site and whether your banner handles it correctly — an instant, surface-level check, no account needed.

Check your site for free →

Frequently asked questions

Do you need consent for the id5 cookie?

Yes. id5 is a "Marketing" cookie, so it is not strictly necessary. Under the ePrivacy Directive (2002/58/EC) and Romania's Law 506/2004, you must obtain the visitor's explicit consent before setting it.

What does the id5 cookie do?

ID5 cookie storing a shared universal ID used for user identification and audience matching in programmatic advertising.

Who sets the id5 cookie?

The id5 cookie is associated with ID5 and is classified as marketing.