Cross-Domain Tracking Guide
Implement cross-domain tracking for accurate user journeys. Learn how to track users across multiple domains.
Cross-Domain Tracking Explained
Cross-domain tracking connects user sessions across multiple domains. Essential for accurate attribution and funnel analysis.
When You Need It
Multiple domains in customer journey, separate checkout domain, or subdomain tracking requirements.
GA4 Cross-Domain Setup
Configure domains in GA4 settings, implement proper linking, and test cross-domain functionality.
Implementation Methods
Automatic linking with gtag.js, manual linking with GTM, or Measurement Protocol for server-side.
Testing Cross-Domain Tracking
Use GA4 DebugView to verify client IDs persist across domains. Check referral exclusions.
Common Issues
Broken client ID passing, incorrect referral exclusions, and missing domain configuration.
Subdomain Tracking
Configure cookie domain for subdomain tracking. Simpler than cross-domain but still requires setup.
Best Practices
- Test thoroughly before launch
- Document domain relationships
- Monitor for tracking breaks
- Exclude internal domains from referrals