How does Piwik PRO detect unique and returning visitors?

Piwik PRO detects unique and returning visitors:

  • By User ID – except for the fact that UserID allows you to easily recognize your visitors, it also provides another great benefit. UserID will recognize returning visitors across multiple devices. No matter if your visitors log into your website from their computer, phone or tablet, you will always know that it’s the same person;
  • By Visitor ID;
  • Through fingerprint – the visitor fingerprint is a hash of a set of the visitor’s settings and attributes. The fingerprint (also called config_id or config hash) is a unique string calculated for a visitor based on their operating system, browser, browser plugins, IP address and browser language. This fingerprint is necessary to process unique visitors accurately, but we aim to take all possible measures to protect users privacy.
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