YouTube videos embedded on websites use cookies to track user behavior and collect data. The following are 21 unique cookies used by YouTube for this purpose, along with their maximum storage duration:
1. iU5q-!O9@$ – Registers a unique ID to keep statistics of what videos from YouTube the user has seen (Session)
2. LAST_RESULT_ENTRY_KEY – Used to track user’s interaction with embedded content (HTTP Cookie, 180 days)
3. LogsDatabaseV2:V#|| – Logs requests and store data in IndexedDB (Persistent, 180 days)
4. nextId – Registers a unique ID to keep statistics of what videos from YouTube the user has seen (Session)
5. remote_sid – Necessary for implementation and functionality of YouTube video-content on the website (HTTP Cookie, Session)
6. requests – Tracks user’s interaction with embedded content (HTTP Cookie, 180 days)
7. ServiceWorkerLogsDatabase#SWHealthLog – Logs data in IndexedDB for service workers (Persistent, 180 days)
8. TESTCOOKIESENABLED – Used to track user’s interaction with embedded content (HTTP Cookie, 1 day)
9. VISITOR_INFO1_LIVETries to estimate users’ bandwidth on pages with integrated YouTube videos (HTTP Cookie, 180 days)
10. VISITOR_PRIVACY_METADATAStores the user’s cookie consent state for the current domain (HTTP Cookie, 180 days)
11. YSC – Registers a unique ID to keep statistics of what videos from YouTube the user has seen (Session)
12. yt.innertube::nextId – Registers a unique ID to keep statistics of what videos from YouTube the user has seen (Persistent, HTML Local Storage)
13. yt.innertube::requests – Registers a unique ID to keep statistics of what videos from YouTube the user has seen (Persistent, HTML Local Storage)
14. ytidb::LAST_RESULT_ENTRY_KEY – Used to track user’s interaction with embedded content (Persistent, HTML Local Storage)
15. YtIdbMeta#databases – Used to track user’s interaction with embedded content in IndexedDB (Persistent, 180 days)
16. yt-remote-cast-available – Stores the user’s video player preferences using embedded YouTube video (Session)
17. yt-remote-cast-installed – Stores the user’s video player preferences using embedded YouTube video (Session)
18. yt-remote-connected-devices – Stores the user’s video player preferences using embedded YouTube video (Persistent, HTML Local Storage)
19. yt-remote-device-id – Stores the user’s video player preferences using embedded YouTube video (Persistent, HTML Local Storage)
20. yt-remote-fast-check-period – Stores the user’s video player preferences using embedded YouTube video (Session)
21. yt-remote-session-app – Stores the user’s video player preferences using embedded YouTube video (Session)
These cookies allow YouTube to track users’ behavior, estimate their bandwidth, and store their cookie consent state, among other things. The storage duration varies from session-based to persistent, with some lasting up to 180 days.
Source: https://www.weforum.org/stories/2025/01/davos-2025-special-address-javier-milei-president-argentina