PhotoStack allows you to create custom watermarks, which can then be added to your images from the watermarks settings in the main editor. Watermark data is saved locally in your browser's storage, and is not uploaded or shared.
You can backup or share watermarks by clicking Export, which saves them as a file to your device. You can then click Import on the Watermarks page on another device to add them to this list.
Missing some watermarks? You may need to visit open the previous version of PhotoStack and export your old watermarks. After that, you can import them here.