You can create some picture like watermark png file with some tool:
Draw Image from your photos lib
Draw Text
Draw ellipse , rectangle shape ..
Free drawing
Can export any resolution : 2k , 4k ...
Very simple and easy to implements.
Use swift version >= 4.
The website created with MERN-Stack with fully responsive designand contact event forms and a donation page with payment getaway and all the images gallery data and contact data displayed in admin panel with secure admin authentication.