_ga

2 years

Registers a unique ID that is used to generate statistical data on how the visitor uses the website.

_gid

24 hours

Registers a unique ID that is used to generate statistical data on how the visitor uses the website.

_gat

1 minute

Used by Google Analytics to throttle request rate.

_ga_{CONTAINERID}

2 years

Used by Google Analytics to persist session state.

_vis_opt_exp_{CAMPAIGNID}_goal_{GOALID}

100 days

This cookie is created when a campaign goal is triggered. This cookie, when created, will always have a value of 1.

_vis_opt_test_cookie

Expires on browser close

This cookie is created to detect if the cookies are enabled on the visitor’s browser or not. It also helps in tracking the number of browser sessions a visitor has gone through. The value of this cookie is always 1.

_vis_opt_exp_{CAMPAIGNID}_combi

100 days

This cookie is created when a visitor is chosen for a particular variation for a test. This cookie makes sure that visitors see the same variation when they revisit the page in the future. Here the Control has a value of 1, Variation #1 has a value of 2, Variation #2 has a value of 3, and so on.

_vis_opt_exp_{CAMPAIGNID}_exclude

100 days

This cookie is created when a visitor has been excluded from a Test Campaign due to the traffic percentage specifications. The value is always 1.

_vis_opt_exp_{CAMPAIGNID}_split

100 days

This cookie is created when one of the variations is chosen for the visitor, but the visitor is not yet redirected to the variation page. It exists so that VWO can verify that the variation page corresponds to the chosen variation after landing on the page. The value is >=2 (as 1 corresponds to Control and it’s not created in case the Control is chosen).

_vis_opt_s

100 days

This cookie tracks session created for a visitor, i.e., the number of times the browser was closed and reopened. The value is >=1, followed by a pipe sign. For example, the value of 2 indicates that the visitor restarted the browser once while 3 means twice.

_vis_opt_out

10 years

This cookie indicates that the visitor should not be made part of any campaign. Its value is 1.

_vwo_uuid

10 years

This cookie generates a unique id for every visitor and is used for the report segmentation feature in VWO, and it also allows you to view data in a more refined manner.

_vwo_uuid_{CAMPAIGNID}

10 years

This cookie is created for each cross-domain campaign. It generates a unique id for every visitor and is used for the report segmentation feature in VWO, and it also allows you to view data in a more refined manner.

_vwo_ds

Depends on the retention period of the account

This cookie stores persistent visitor-level data for VWO Insights.

_vwo_sn

30 mins and reset again to 30 mins on visitor activity

This cookie stores session-level information.

_vwo_uuid_v2

366 days

This cookie calculates unique traffic on a website.

_vis_opt_exp_{CAMPAIGNID}_combi_choose

Persists until campaign changes are applied

This cookie stores the chosen combination. It’s a temporary cookie that gets deleted when the campaign changes are applied.

_vwo_referrer

15 seconds

This cookie stores referral info allowing VWO to identify the original Traffic source in case of the Split URL campaign.

_vwo

Expires in 2096 years

This cookie is a jar of all the cookies. It is currently created only for the Safari browser. In the future, it would replace all the cookies. The actual expiry of a cookie doesn’t matter as it stores the expiry of cookies set in it and keeps on expiring them.

_vwo_global_opt_out

100 days

This cookie is persisted when a visitor opts out of vwo on all websites in a given browser.

_vwo_ssm

3650 days

This cookie is used for testing and is created only on sites that use the HTTP protocol. This is used to check if VWO can create cookies on them, post which this cookie is deleted.