| Name | Purpose | Use | Duration |
| _pk_id | Stores a unique visitor ID. | First-party website analytics | 13 months |
| _pk_ses | The session cookie temporarily stores data for the visit. | First-party website analytics | 30 minutes |
| _pk_ref | Stores attribution information (the referrer that led the visitor to the website). | First-party website analytics | 6 months |
| _pk_testcookie | Temporary cookie to check whether a visitor's browser supports cookies (only set in Internet Explorer). | First-party website analytics | Temporary cookie that expires almost immediately after being set. |
| matomo_sessid | A nonce to prevent CSRF security issues when using the opt-out feature. | Security feature | 14 days |
| mtm_consent_removed | Indicates that a visitor has opted out of Matomo tracking. | Opt-out-Administration | 30 years, but may be removed earlier depending on browser rules (see usage details). |
| mtm_cookie_consent | Records the visitor's consent to Matomo tracking. | Consent management | 30 years, but may be removed earlier or configured with a shorter expiration period depending on browser rules (see usage details). |
| _pk_hsr | Session cookie temporarily stores heatmap session data when using the Matomo heatmap function. | First-party website analytics (Heatmaps-funktion) | 30 minutes |
| _pk_uid | When enabled, this cookie assigns the same ID to a visitor navigating across all your domains and subdomains, allowing Matomo to recognize users across devices and sessions. It is only used if third-party cookies are enabled in Matomo's configuration file. | Optionales Drittanbieter-Cookie (not enabled by default) | 13 months |
| MatomoAbTesten | Stores information for Matomo A/B testing via local storage. | First-party website analytics (A/B-test-function) | No expiration (remains until explicitly deleted by the visitor or the application). |
