Add Watermark is a free app which helps individuals and business ensure that their content is protected with straightforward watermarks. Attach a semi-transparent mark to pictures and images to help protect against unwanted copying, custom fonts and size, upload directly in-app and save templates for batches of images. The free version has a limited number of output features, such as image size, while the paid version offers a full range. A great free option for those with occasional watermark needs.