What is the AnalyticsSyncHistory cookie?
AnalyticsSyncHistory is an HTTP cookie set on the linkedin.com domain, used by LinkedIn as part of its marketing and analytics tools, such as the LinkedIn Insight Tag or embeddable widgets like the Share or Follow buttons.
It appears on a website whenever a page loads a LinkedIn script or widget (for example, a social share button or a conversion pixel for LinkedIn Ads campaigns), even if the visitor doesn't have a LinkedIn account or isn't logged in.
What data it stores
The cookie holds information related to syncing analytics data collected about the visitor across sessions and, potentially, across devices linked to the same LinkedIn account or tracking profile. LinkedIn does not publicly document the exact format of the value.
The data is sent to LinkedIn's servers (linkedin.com and its associated infrastructure) and may be used alongside other LinkedIn cookies (such as bcookie, lidc, or UserMatchHistory) to build a behavioral profile of the visitor.
What it is used for
Its main purpose is to let LinkedIn synchronize analytics data collected from various sites and integrations (widgets, Insight Tag), so that visitor behavior data stays consistent and reusable for advertising and campaign measurement purposes.
For the website owner, this cookie is usually a side effect of embedding LinkedIn elements (a share button, a conversion pixel) rather than a direct choice — but it remains their responsibility to disclose it and obtain consent.
Does it require consent?
AnalyticsSyncHistory falls under the marketing category (advertising/tracking). Under GDPR and the ePrivacy Directive, this type of cookie cannot be placed before the visitor gives explicit consent.
- Website owners must disclose it in their cookie policy, listing the provider (LinkedIn), category (marketing), and duration (30 days).
- The LinkedIn script or widget that sets this cookie should only load after consent for the marketing category has been given.
How to block or delete AnalyticsSyncHistory
A visitor can delete or block this cookie through browser settings (Chrome, Firefox, Edge, Safari – per-site cookie management) or by using tracker-blocking extensions. They can also decline the "marketing" category in the site's consent banner.
For website owners, the most practical approach is to automatically block LinkedIn scripts and widgets until consent is given, using a CMP like CookieFix, which stops them from loading before the visitor accepts the marketing category.
Frequently asked questions
It's a cookie set by LinkedIn to synchronize analytics data collected about visitors across sessions and LinkedIn integrations on different websites.
Yes, it's classified as a marketing/tracking cookie, so it requires prior visitor consent under GDPR.
Its typical duration is 30 days, after which it expires automatically.
You can use a CMP that automatically blocks LinkedIn scripts and widgets until the visitor accepts the marketing category.