Limit for custom parameters of custom Firebase Analytics events?

Both event and user parameters are limited to 25.

LogEvent method docs: https://firebase.google.com/docs/reference/android/com/google/firebase/analytics/FirebaseAnalytics#public-method-summary

I collect the information based on all the official documentation, hope you helps

Custom Events and Parameters Limitations

• 23 Automatic Registered Events - Source
• 500 Custom Events - Source and Source
• Up to 25 custom parameters per event - Source
• Up to 50 custom event parameters per project - Source
• From the 50 custom parameters only 40 must be numeric (Long, Double) and 10 textual (String) values - Source
• Parameter names can be up to 40 characters long alfanumeric with underscores - Source
• Parameter textual values can be up to 100 characters long - Source
• Up to 30 events per project as conversions - Source