URL Query Parameter Appender is a browser extension for Chrome that automates the addition of query parameters to URLs based on specific hostnames. Ideal for developers and marketers, it helps ensure consistency in tracking codes, analytics tags, and affiliate identifiers across browsing sessions. The tool features an intuitive interface for managing multiple mappings, allowing users to create, edit, and delete parameters with ease. Real-time input validation prevents errors, while inline editing and auto-save functionalities enhance usability.

The extension supports multiple mappings for the same hostname, merging parameters where applicable. It utilizes the declarativeNetRequest API for swift URL modifications and stores configurations securely in the browser's sync storage. Privacy is prioritized, as no personal data is collected or inspected. With its robust features and user-friendly design, URL Query Parameter Appender streamlines the process of managing URL parameters, making it a valuable tool for anyone needing efficient URL management.