If you need full third-party cookie access for development or legacy systems, you can re-enable the old behavior via Chrome Flags.
Steps:
📉 Drawback: Google will remove this flag eventually. Use only as a short-term solution. unblock third party cookies chrome
Date: April 21, 2026
Scope: Enterprise, Developer, and Power User contexts
Status: Post-Chrome Privacy Sandbox Enforcement
Chrome may still block them due to:
Fix: Disable extensions temporarily or use a standard Chrome window (not incognito).
Only for managed Chrome devices (GPO, MDM, registry). If you need full third-party cookie access for
Result: Only that specific site can load third-party cookies. All others remain blocked.
To detect if a user has managed to unblock third-party cookies: 📉 Drawback: Google will remove this flag eventually
// Attempt to set a third-party cookie via image beacon
let img = new Image();
img.src = 'https://third-party.example/set_cookie?test=1';
// Then check via fetch with credentials: 'include'
fetch('https://third-party.example/check_cookie', credentials: 'include' )
.then(r => r.json())
.then(data => console.log('3P cookie allowed:', data.hasCookie));
Note: As of 2026, this will return false for >99% of traffic.