personalization_id — X (Twitter)
By the OpenCookies team · published 2026-10-22 · updated 2026-10-22
- Service
- X (Twitter)
- Category
- Advertising and profiling
- Default duration
- 2 years
- Type
- Third-party cookie (set by another domain)
- Consent required?
- Yes, before any storage or reading.
What is it for?
X (formerly Twitter) cookie tied to personalization and advertising. It appears when a button, an embedded post or the X pixel is loaded.
What does it look like?
The value looks like v1_XXXXXXXXXXXXXXXX: a version prefix and an identifier.
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 any X resource (embedded posts, buttons, pixel) 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”.
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 is it seen with an embedded post?
Because the post loads X resources that set this cookie.
How to avoid it?
By replacing the embed with a link or screenshot, which loads nothing before the click.
Durations are defaults and may change with configuration. This page describes a cookie; it is not legal advice.