Disable default WordPress image sizes

// Disable default WordPress image sizes

add_filter('intermediate_image_sizes', '__return_empty_array');

// Disable large scaled image size

add_filter('big_image_size_threshold', '__return_false');

// Disable WooCommerce image sizes and prevent WooCommerce from regenerating sizes

add_action('after_setup_theme', function () {

    // WooCommerce image sizes

    remove_image_size('woocommerce_thumbnail');

    remove_image_size('woocommerce_single');

    remove_image_size('woocommerce_gallery_thumbnail');

    // Clear WooCommerce image dimensions to stop regeneration

    update_option('woocommerce_thumbnail_image_width', 0);

    update_option('woocommerce_single_image_width', 0);

    update_option('woocommerce_gallery_thumbnail_image_width', 0);

}, 20);