Overlayd is a super simple app to add watermark. Especially on sensitive images/photos such as identity card.

Offline first, you can use Overlayd without any internet connections. This app also doesn't collect your data or upload photos/images somewhere else.

To add watermark, simply:
1. Select photos
2. Add your watermark text on the provided text field
3. Set the position and opacity of the text, tap Save.

Easy, right?