On our old ecommerce store folks would save our product images and use them in their eBay listings. It was nice that people liked our images enough to copy them and use them, but still. When we moved to Shopify we were excited to give this Image Watermarker a try. It does just what it says it does ... we load new product and it watermarks right away. It does not watermark the old images we have within the product descriptions, but all the main product images and any new products we list all have watermarks. Great app!