In this article, I’ll show you how to allow anonymous users to add items to a SharePoint list using the PowerShell script. We have the following requirements for the script:

• Allow user to input Site URL and List Name
• Check to see if the list has Unique permissions or not
• If not, we will reset the broken inheritance first and then set anonymous access to it
• If yes, we will only set anonymous access on it

When setting anonymous access to a list, we need to identify the following permissions:

AddListItems, Open, OpenItems, ViewListItems, ViewVersions, ViewFormPages, ViewPages, UseClientIntegration, UseRemoteAPIs

How does it work?

Download AnonymousList.ps1 file to your server.

Run PowerShell script and input URL site; List Name. Click Enter

Go to your list URL with Anonymous Access to add a new item.