[GA4] Event collection limits

These limits apply on a per-property basis. You can increase certain limits (but not event/parameter character limits) by upgrading your property to Google Analytics 360. For configuration limits, see this article instead.

Collection limits

Google Analytics doesn't log events, event parameters, and user properties that exceed the following limits. For example, Analytics doesn't process the 26th user property nor does it process an event name with more than 40 characters.

For detailed information about the error events that Analytics logs when you exceed the following collection limits, see Analytics Error Codes.

Logged item	Limit (For 360 limits, go here)	Can I archive items if I'm close to the limit?
Distinctly named events There is not limit on the number of distinctly named events for web data streams.	500 per app user (for app data streams) You might see more than 500 distinctly named events if users on different app instances trigger different events. Automatically collected events and enhanced measurement events don't count toward the limits.	No
Length of event name	40 characters. If you mark an event as a key event and the event exceeds 40 characters, then the event will not be reported as a key event because the appended "_c" will be missing.	N/A
Event parameters per event	25 event parameters	Yes
Item-scoped parameters per event	In addition to the prescribed item-scoped parameters for each recommended ecommerce event, you can include up to 27 item-level custom parameters in an ecommerce event.	Yes
Length of event parameter name	40 characters	N/A
Length of event parameter value	100 characters The following exceptions apply: the page_title parameter must be 300 characters or fewer the page_referrer parameter must be 420 characters or fewer the page_location parameters must be 1,000 characters or fewer	N/A
User properties	25 per property	No
Length of user property names	24 characters	N/A
Length of user property values	36 characters	N/A
Length of User-ID values	256 characters	N/A

Character limits

The character limits are the same for single-width character languages (e.g., English) and double-width character languages (e.g., Japanese). The encoded URL character length is used when counting character limits.