{
  "kind": "limits_reference",
  "collection_limits_per_property": {
    "distinctly_named_events_web": "no limit",
    "distinctly_named_events_app": "500 per app user",
    "distinct_sessions_per_user_per_day": 2000,
    "conversions_per_user_per_day": 10000,
    "events_per_user_per_day": 100000,
    "event_name_length": "40 characters",
    "event_parameters_per_event": 25,
    "item_scoped_custom_parameters_per_event": "27, in addition to prescribed item parameters",
    "event_parameter_name_length": "40 characters",
    "event_parameter_value_length": "100 characters",
    "parameter_value_exceptions": {
      "page_title": 300,
      "page_referrer": 420,
      "page_location": 1000
    },
    "user_properties": 25,
    "user_property_name_length": "24 characters",
    "user_property_value_length": "36 characters",
    "user_id_value_length": "256 characters"
  },
  "configuration_limits_per_property": {
    "audiences": 100,
    "saved_comparisons": 50,
    "saved_segments": 50,
    "key_events": 30,
    "custom_insights": 50,
    "user_scoped_custom_dimensions": 25,
    "event_scoped_custom_dimensions": 50,
    "event_scoped_custom_metrics": 50,
    "registered_custom_key_events": 30,
    "data_export_rows": 100000,
    "data_retention": "up to 14 months",
    "ads_links": 400
  },
  "archivable": [
    "key events",
    "audiences",
    "custom insights",
    "user-scoped custom dimensions",
    "event-scoped custom dimensions",
    "event-scoped custom metrics"
  ],
  "not_archivable": [
    "user properties",
    "saved comparisons",
    "saved segments"
  ],
  "guide": "ga4-event-limits-reference",
  "title": "The GA4 event limits reference: 25 parameters, 40-character names, and the 100,000-a-day ceiling",
  "worked_example": {
    "parameters_sent": 27,
    "parameter_cap": 25,
    "parameters_over": 2,
    "event_name_length": 41,
    "event_name_cap": 40,
    "name_characters_over": 1,
    "user_properties": 26,
    "user_property_cap": 25,
    "key_events_used": 23,
    "key_event_cap": 30,
    "key_event_slots_left": 7,
    "audiences_used": 100,
    "audience_cap": 100,
    "audience_slots_left": 0
  },
  "verification": "Figures recomputed in Python 3 with decimal arithmetic, 2026-11-11. No live GA4 run."
}