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Here’s a list of all the cookies that may be set in a visitor’s browser and backed up to local storage to prevent data loss. You’ll find their detailed descriptions just below this table.
Always (1) (if the 30-minute cookie option is turned on)
Never (if the cookie-free option is turned on)
13 months for non-anonymous visitors
30 minutes for anonymous visitors if the 30-minute cookie option is turned on
Note: Cookies are not created in mobile apps (Android or iOS). If you use our SDKs, you will not use cookies.
Here’s a detailed description of each cookie.
_pk_id.<appID>.<domainHash>
Module: Tracker (JS tracking client) Expires after: 13 months (can be changed in UI or JS API) or 30 minutes for anonymous visitors if the 30-minute cookie option is turned on Extends: No Type: First-party cookie
About: Used to recognize visitors and hold their various properties.
Value: <cookieID>.<cookieCreationTimestamp>.<visitsCount>.<currentVisitTimestamp>.<lastVisitTimestamp>.<lastEcommerceOrderTimestamp>
<cookieID>.<cookieCreationTimestamp>.<visitsCount>.<currentVisitTimestamp>.<lastVisitTimestamp>.<lastEcommerceOrderTimestamp>
_pk_ses.<appID>.<domainHash>
Module: Tracker (JS tracking client) Expires after: 30 minutes after the visitor’s last event (can be changed in UI or JS API) Extends: Automatically Type: First-party cookie
About: Shows the visitor’s active session. If the cookie doesn’t exist, it means that the session ended more than 30 minutes ago and was counted in the _pk_id cookie.
Value: * (No data is stored in this cookie)
*
ppms_privacy_<appID>
Module: Consent Manager Expires after: 12 months (can be changed) Extends: Automatically Type: First-party cookie
About: Stores the visitor’s consent to data collection and usage.
Value: A JSON-encoded object that holds the visitor’s consent to data collection and usage.
Created if: You use Consent Manager and display a consent form on your site.
Decoded cookie:
{
"consents":{
"analytics":{
"status":-1,
"updatedAt":"2020-01-30T12:15:47.283Z"
},
"ab_testing_and_personalization":{
"status":1,
"updatedAt":"2020-01-31T10:56:35.447Z"
"custom_consent":{
"status":0,
"user_feedback":{
"marketing_automation":{
"remarketing":{
"conversion_tracking":{
"visitorId":"564e3818-27e7-e38f-39dd-569067520af2",
"domain":{
"normalized":"client1.piwikpro.test",
"isWildcard":false,
"pattern":"client1.piwikpro.test"
"staleCheckpoint":"2020-01-31T10:56:27.699Z"
}
stg_traffic_source_priority
Module: Tag Manager Expires after: 30 minutes Extends: Automatically Type: First-party cookie
About: Stores the type of traffic source from which the visitor came to your site.
Value:
Created if:
stg_last_interaction
Module: Tag Manager Expires after: 365 days Extends: Automatically Type: First-party cookie
About: Indicates whether the last visitor’s session is still running or a new session has started.
Value: The timestamp of the visitor’s last interaction with your site.
stg_returning_visitor
About: Indicates whether the visitor has been to your site before – they are a returning visitor.
Value: The timestamp of the last time the visitor interacted with your site.
stg_fired__<conditionID>
Module: Tag Manager Expires after: The session ends (Fixed idle time or after a browser is closed) Extends: No Type: First-party cookie
About: Indicates whether the tag and trigger combination was fired during the current visitor session. This cookie can be set multiple times with different condition IDs.
Cookie value: The timestamp of when the tag was fired.
Created if: You use a multiplicity condition in a trigger and the trigger is set to fire the tag once per session. The cookie is created after the tag fires.
stg_utm_campaign
About: Stores the name of the campaign that directed the visitor to your site.
Cookie value: The encoded value of the utm_campaign query parameter.
stg_pk_campaign
Cookie value: The encoded value of the pk_campaign query parameter.
stg_externalReferrer
About: Stores the URL of the site that referred the visitor to your site.
Cookie value: The value of window.location.origin of the referring site.
_stg_optout
About: Helps to turn off all tracking tags on your site.
Cookie value:
Created if: A visitor opts out of tracking by using an opt-out form on your site.
_pk_cvar.<appID>.<domainHash> (deprecated)
Module: Tracker Expires after: 30 minutes after the visitor’s last event (can be changed in UI or JS API) Extends: Yes Type: First-party cookie
About: Stores a custom variable that is part of the visit scope.
Cookie value: Custom variable keys and values.
Created if: You created a custom variable in the visit scope and such a variable was tracked for the visitor. This cookie will only be created if your developer allows it to be created via the storeCustomVariablesInCookie() method in the JS API.
Note: This cookie is deprecated because we plan to remove custom variables from Piwik PRO. We encourage you to use custom dimensions instead as they don’t require cookies to work properly.
stg_global_opt_out (deprecated)
Module: Tag Manager (versions below 16.0.0) Expires after: 365 days Extends: Automatically Type: Third-party cookie
About: Helps to turn off all tracking tags on sites that belong to one Piwik PRO account.
Here’s a detailed description of information stored in local storage.
ppms_webstorage
Module: Tracker (JS tracking client), Tag Manager, Consent Manager
About: Prevents the possible loss of visitor data caused by certain browser mechanisms, like Safari’s ITP.
Value: A string object that contains information about all cookies created, including key, value, expiration date, path, domain and so on.
Created if: Each time a cookie is set in a visitor’s browser.
Removed if: The ppms_webstorage element is not deleted automatically, but a visitor can delete it manually. Individual entries in the object are deleted when the corresponding cookie expires.
ppms_data_store (deprecated)
Module: Tracker (JS client tracker), Audience Manager, Tag Manager (versions below 16.0.0)
About: Stores information from forms on your site. When a visitor submits a form, the data is transferred to Audience Manager. However, if the form redirects the visitor to another page, the data may be lost. That’s why form data is stored in local storage as a backup. (The page where the visitor is redirected must have a form tracker, otherwise Piwik PRO can’t collect form data).
Value: A JSON-encoded object that contains:
Removed if: After the tracker sends the form data to the server. This can happen as soon as the visitor submits the form or after a new page loads in the browser.
Proceq is now part of Screening Eagle Technologies. Screening Eagle is a merger of Dreamlab, a Singapore-based software and robotics company and Proceq, a Swiss-based NDT company with a 65+ year heritage as a market leader in portable sensors. Together, we protect the built world with software, sensors and data.
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