Cookie list

Why does Clarity set cookies?

Clarity's normal functioning requires that we set cookies on your visitor's browser. These cookies are placed by the setup script that you installed to run Clarity. When the script is installed, Clarity's cookies send us non-personally identifiable information about your users.

Note

  • If a user has disabled cookies on the browser, Clarity doesn't set cookies.

What cookies does Clarity set?

Name Purpose Value Passed
_clck Persists the Clarity User ID and preferences, unique to that site, on the browser. This ensures that behavior in subsequent visits to the same site will be attributed to the same user ID. String
_clsk Connects multiple page views by a user into a single Clarity session recording. String
CLID Identifies the first-time Clarity saw this user on any site using Clarity. String
ANONCHK Indicates whether MUID is transferred to ANID, a cookie used for advertising. Clarity doesn't use ANID and so this is always set to 0. Flag
MR Indicates whether to refresh MUID. Flag
MUID Identifies unique web browsers visiting Microsoft sites. These cookies are used for advertising, site analytics, and other operational purposes. GUID
SM Used in synchronizing the MUID across Microsoft domains. Character Flags

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