Signature Watermark is a WordPress plugin designed to automatically apply watermarks to images as they are uploaded to the WordPress Media Library. It supports both PNG watermarks with transparency for detailed customization and text watermarks that can be adjusted in color, size, and transparency. Users can choose from various watermarking options, including combinations of text and images, or use either one alone. The intuitive settings page allows for easy configuration of watermark appearance, and a preview feature enables users to test settings before finalizing them.

The plugin controls watermark size as a percentage of the target image, ensuring that the watermark is proportionate. For users seeking more advanced features, an upgrade to Signature Watermark Ultra is available, offering options like manually applying watermarks to previously uploaded images, fully adjustable positions for text and images, and enhanced JPEG quality. With its user-friendly interface and extensive customization options, Signature Watermark is a practical tool for protecting images on WordPress websites.