FunctionalConsent required
What is the PREF Cookie?
Set by YouTube (Google LLC). Expires after 8 months.
Purpose
Stores preferences for embedded YouTube players, such as preferred playback quality, volume, and interface settings.
Set by standard YouTube embeds. Use the youtube-nocookie.com 'privacy-enhanced' embed mode and load it only after consent.
Cookie Details
| Cookie Name | PREF |
| Service | YouTube |
| Provider | Google LLC |
| Category | Functional |
| Duration | 8 months |
| Consent Required | Yes — requires explicit opt-in |
Category: Functional
Functional cookies enhance the website's functionality and personalisation. They may be set by us or by third-party providers. Consent is required under GDPR.
GDPR Requirements
Under GDPR and the ePrivacy Directive, the PREF cookie requires explicit user consent before it can be set. This means:
- The cookie must not be set when a user first visits your site — not even for a fraction of a second
- A consent banner must be displayed, and the user must actively accept analytics/marketing cookies
- If the user rejects or ignores the banner, this cookie must remain blocked
- The cookie must be listed in your cookie policy with its name, purpose, and retention period
- Users must be able to withdraw consent at any time, which must also remove or invalidate this cookie
How to Handle This Cookie
- Block it by default — configure your Consent Management Platform (CMP) or tag manager to prevent YouTube from loading until the user accepts functional cookies.
- Include it in your consent categories — map it to the "Functional" category in your CMP configuration.
- List it in your cookie policy — document the cookie name, purpose, provider (Google LLC), and expiry (8 months).
- Sign a DPA — ensure you have a Data Processing Agreement with Google LLC covering their use of data collected via this cookie.
- Verify it works — in an incognito browser, reject cookies and confirm
PREFis not set.
Other YouTube Cookies
| Cookie | Category | Duration |
|---|---|---|
| YSC | Functional | Session |
| VISITOR_INFO1_LIVE | Marketing / Advertising | 6 months |
| LOGIN_INFO | Marketing / Advertising | 2 years |
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