Google Analytics 4 Events Encyclopedia

A practical selection of GA4 events with GTM implementation examples

Verified: June 23, 2026 54 events 6 categories

Browse all Google Analytics 4 events or select a category above.

Displaying: 54 events

Quick reference

GA4 Limits

  • No limit on distinct event names for web streams; 500 per app user for app streams
  • 25 parameters per event
  • 27 custom item parameters in addition to prescribed item parameters
  • 40 characters - max event name
  • 100 characters for most parameter values; documented URL and title exceptions have higher limits

Best Practices

  • Always clear ecommerce: null
  • Use unique transaction_id
  • Use snake_case in names
  • Test in DebugView before production
  • Register Custom Dimensions

Reserved prefixes

  • google_
  • ga_
  • firebase_
  • gtag_

Original editorial summaries based on Google documentation: automatic events, Enhanced Measurement, recommended events.