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Google Analytics Cookies

Google Analytics uses 4 persistent and session cookies as detailed in the table below:

NAME OF COOKIE DESCRIPTION DFAULT EXPIRATION TIME
__utmc:

Session cookie used to detect when the browser window has closed.

End of browser session
__utma:

Persistent cookie used to store the visitors unique (randomly generated) ID. The cookie is updated every time data is sent to Google Analytics.

2 years from set/update
__utmb:

Persistent cookie used to determine new sessions/visits. The cookie is updated every time data is sent to Google Analytics.

30 mins from set/update
__utmz:

Persistent cookie used to store the traffic source or campaign that explains how the visitor reached your site.

6 months from set/update