How to check charger original or fake

Folks seem to keep making posts here asking us, whether or not, the device that they have is a genuine Apple product or not. There is no way to guarantee it that one way, or the other ... even if you provided an image.

The bottom line? If you purchased this item directly from Apple or an Authorized Apple Reseller, then it should be an original product; if not, then chances are that it is a fake.

Ref: About Apple USB power adapters - Apple Support