Test whether your web browser blocks cross-site tracking cookies with our free 3rd Party Cookie Test. Audit Storage Access API permission state and third-party iframe cookie isolation in real time directly inside your browser with complete privacy.
Open the tool to trigger automatic browser storage permission and cookie access queries.
Read the visual security verdict indicator to see if 3rd-party cookies are blocked or allowed.
Analyze Storage Access API permission state and tracking protection flags in the sandbox breakdown.
Queries modern browser Storage Access API permissions to determine if unpartitioned 3rd-party storage access is granted.
Evaluates Safari Intelligent Tracking Protection (ITP), Firefox Enhanced Tracking Protection (ETP), and Chrome Privacy Sandbox policies.
All tests execute in local browser memory. Zero analytics or fingerprint telemetry is collected or sent to remote servers.
Third-party cookies allow cross-site tracking by storing stateful tokens when cross-origin resources or iframes are loaded. Modern user agents enforce strict isolation policies like Safari ITP (Intelligent Tracking Protection) and Chrome CHIPS (Cookies Having Independent Partitioned State).
The W3C Storage Access API (document.hasStorageAccess()) allows embedded cross-site context to check whether unpartitioned cookie storage access has been explicitly granted by user consent or browser heuristic rules.
When third-party cookie access is blocked, cross-site request headers omit the Cookie header for embedded frames, safeguarding user privacy and preventing unauthorized user journey profiling across independent domains.