IDE — Google DoubleClick
By the OpenCookies team · published 2026-10-22 · updated 2026-10-22
- Service
- Google DoubleClick
- Category
- Advertising and profiling
- Default duration
- Up to 13 months (depending on region)
- Type
- Third-party cookie (set by another domain)
- Consent required?
- Yes, before any storage or reading.
What is it for?
Google advertising cookie (DoubleClick): it records the visitor’s actions after seeing or clicking an ad, to measure ad effectiveness and to target ads.
What does it look like?
The value is an opaque string. The cookie is written on the doubleclick.net domain, not on your site.
How to see it in your browser
Open your site, press F12, then choose the “Application” tab (Chrome, Edge) or “Storage” (Firefox). This cookie is written by another domain: look for it under “Cookies”, under the service’s domain. If you cannot see it, your browser may be blocking third-party cookies.
What does the rule say?
Targeted advertising, remarketing and profiling require prior, free and informed consent. These cookies cannot be exempted.
How to prevent it before the choice
Do not load Google Ads / DoubleClick tags before consent.
How OpenCookies handles it
Common services like this one are in OpenCookies’ tracker list: the banner neutralizes their script before the visitor chooses and only restarts it after “Accept”. The test shows whether this cookie appears before the choice, after “Refuse” and after “Accept”.
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.
Related cookies
Frequently asked questions
Why don’t I see it on my site?
Because it is set by another domain (doubleclick.net) and only appears if Google ads are loaded on the page.
Is it visible in browser tools?
Yes, in the cookie list by choosing the doubleclick.net domain, unless the browser blocks third-party cookies.
Durations are defaults and may change with configuration. This page describes a cookie; it is not legal advice.