topic Re: Add Field dialog says GUID field length will be 36, but resulting field length is 38 in ArcGIS Online Questions

Add Field dialog says GUID field length will be 36, but resulting field length is 38

Bud — Thu, 30 Apr 2026 20:22:41 GMT

When I create a new GUID field in AGOL > Contents > Fields, the Add Field dialog says "Store a 36 character string...".

But when I look at the resulting field, its length is 38.

Why does it say 36 when the result is 38?

Re: Add Field dialog says GUID field length will be 36, but resulting field length is 38

DanPatterson — Thu, 30 Apr 2026 21:32:05 GMT

Calculate Unique Identifier Values Similar to Global IDs perhaps this

Re: Add Field dialog says GUID field length will be 36, but resulting field length is 38

JonathanMcD — Fri, 01 May 2026 14:50:20 GMT

Any reason for not creating relationship classes and tables in Arc Pro? @Bud

Re: Add Field dialog says GUID field length will be 36, but resulting field length is 38

Bud — Mon, 04 May 2026 14:09:55 GMT

Good point. I have to admit, I haven't used relationship classes much. I'll try them out. Do they automatically populate GUID fields?

Re: Add Field dialog says GUID field length will be 36, but resulting field length is 38

Bud — Mon, 04 May 2026 14:23:56 GMT

Esri Case #04168794 - ArcGIS Online - Add Field dialog says GUID field length will be 36, but resulting field length is 38

This is expected because 38 includes dashes and brackets. For reference, I've included an example below. (More information regarding this can be found here.)

Example: {7ec3018d-4a49-4a13-8e15-005846b25848}