The amzn_user_data cookie is set by Amazon services embedded on third-party websites, such as the Amazon Associates affiliate programme, Amazon Pay, or Amazon Advertising pixels.
It stores user-related information that helps Amazon identify returning visitors, attribute referral traffic, and personalise the shopping experience when the user navigates to Amazon. The cookie typically contains an encoded user identifier and session metadata. Because it is set by an Amazon domain loaded within a third-party page, it functions as a third-party cookie and is subject to browser-based blocking and privacy-regulation consent requirements.
As a third-party tracking cookie, amzn_user_data falls squarely within the scope of GDPR’s ePrivacy requirements and CCPA’s opt-out provisions. Websites that embed Amazon services must disclose this cookie in their privacy policy, list it in their consent banner under the advertising or marketing category, and block it from loading until the visitor provides consent.
Failure to do so can result in regulatory fines and reputational damage. Browser-level changes, such as Chrome’s planned deprecation of third-party cookies, may eventually render this cookie non-functional without server-side alternatives.
Seers’ cookie scanner automatically detects the amzn_user_data cookie during site scans and categorises it as a marketing or advertising cookie. The consent banner then blocks the associated Amazon script from loading until the visitor opts into marketing cookies.
If consent is granted, the script loads and the cookie is set; if consent is denied or later withdrawn, Seers.ai prevents the script from executing and triggers deletion of the cookie. This automated lifecycle management keeps your Amazon integrations compliant without manual intervention.
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