To track visitors, Matomo (Piwik) by default uses 1st party cookies, set on the domain of your website. Cookies created by Matomo start with: _pk_ref, _pk_cvar, _pk_id, _pk_ses. When you use the Heatmap & Session Recording plugin, a cookie _pk_hsr will be created.

When you exclude yourself from being tracked using the cookie method, Matomo (Piwik) will create a cookie piwik_ignore set on the domain of your Matomo server (which might be a third party cookie if Matomo is setup on a different URL from the website being tracked).

You can also Disable all first party cookies from being set — for example for privacy reasons.

Matomo (Piwik) by default does not use third party cookies but you can enable a third party _pk_uid cookie it if you wish.

Learn more about What data does Matomo (Piwik) track?.

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