WooCommerce Quantity Increment is a free WordPress plugin designed to enhance the default number input fields used for cart quantities in WooCommerce. This plugin offers JavaScript powered inputs that allow for greater customization of the appearance and functionality of quantity selectors. By installing and activating this plugin, users can improve the overall shopping experience on their eCommerce sites without any complex coding requirements.

Additionally, the plugin includes an optional Number Polyfill, which ensures that the HTML5 element functions properly in browsers that do not support it. To implement this feature, users simply need to add a specific code snippet to their theme's functions.php file. This straightforward setup allows for seamless integration and enhanced control over quantity inputs.