I want to know my charger is real or fake

About Apple USB power adapters --> https://support.apple.com/HT210133

See if your charger matches any of the ones in the article but realize that anybody making a good fake charger will just copy valid information from a real charger onto it. With this kind of thing often the only way to tell for sure is to only purchase the item from Apple itself or an authorized reseller.

Is this A1399 model charger is original apple or fake copy

is apple A1399 charger is real or fake