Shot On Camera is an smart solution that allow you to add watermark. This app lets you add detailed information to photo like which smartphone you used to capture the picture and can also copyright it by adding your name.
Customize according to your needs! The setting has various options to choose from. You can select if you want to keep the original photo or not, select a phone brand, model name and shot by text easily. App also allows you to select the position and size of shot on a logo.