OpenCookies

Cookie dictionary

euconsent-v2 — IAB TCF (plateformes de consentement)

By the OpenCookies team · published 2026-10-22 · updated 2026-10-22

Service
IAB TCF (plateformes de consentement)
Category
Strictly necessary
Default duration
Usually 13 months (depending on the platform)
Type
First-party cookie (set by your own site)
Consent required?
No: a cookie strictly necessary for the requested service does not require consent.

What is it for?

Contains the IAB TCF “consent string”: the full set of the user’s choices, readable by advertising partners.

What does it look like?

The value is a long base64-encoded string (“TC string”), often starting with CP.

How to see it in your browser

Open your site, press F12, then choose the “Application” tab (Chrome, Edge) or “Storage” (Firefox). Under “Cookies”, select your site’s address: the euconsent-v2 cookie appears in the list if present, with its value and expiry date.

What does the rule say?

A cookie strictly necessary for the requested service does not require consent. It should still be listed in your cookie policy.

How to prevent it before the choice

Nothing to block: it records the choice. Partners must respect the string it contains.

How OpenCookies handles it

OpenCookies does not block this cookie: it is needed for operation. The test still lets you see which cookies are set before any choice.

Step-by-step guide : Google Consent Mode v2: how to set it up simply

Check it on my site

Does this cookie appear on your site before the visitor chooses? The OpenCookies test shows it in two minutes.

Test my site

Related cookies

Frequently asked questions

What is the TCF?

The Transparency and Consent Framework is an IAB Europe standard that passes the user’s choices to advertising partners.

Is the TCF needed for a small site?

No: it mainly concerns sites that serve programmatic advertising.

Durations are defaults and may change with configuration. This page describes a cookie; it is not legal advice.

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