This article explains how to add text to an image on Mac, Windows, iOS, and Android. The information applies to iOS 13, iOS 12, and iOS 11; Android 8 and 7; macOS Catalina (10.15) through macOS Sierra (10.13); and Windows 10, 8, and 7.
How to add text to photos/images on iPhone
If you have an iPhone running iOS 11 or later, follow these steps to add text to an image.
Open the Photos app and select an image.
Tap Edit in the top left corner.