Image Protector is an application that can protect JPEG images by doing two modifications: deleting EXIF metadata and, optionally, adding a watermark text.

It works like this: you select an image from the device storage, the image is displayed in the application along with its EXIF metadata, then you enter a watermark text (or you can leave it empty for no watermark), click a button to protect the image, and the modified image is saved to the device storage as a new file to the same folder as the original image file (the original image file is not modified and not deleted from storage).

Also, you can use this application as a viewer of EXIF metadata of JPEG images.