How to Add Noindex to Add-to-Cart and Filter URLs in WooCommerce

WooCommerce URLs often contain query parameters like ?add-to-cart= and ?filter_color= which can create duplicate content and bloat your SEO index. To prevent search engines from indexing such URLs, it’s a good practice to add a noindex meta tag dynamically when these parameters are detected.

Here’s a simple way to do it using a custom function in WordPress.

Step-by-Step: Add Noindex Meta Tag for Add-to-Cart & Filter URLs

1. Open your theme’s functions.php file
   located in your child or main theme folder
2. Add the following code:

function wp_noindex_unwanted_urls() {
// Noindex for Add to Cart URLs
if (isset($_GET[‘add-to-cart’])) {
echo ” . “\n”;
return;
}

// Noindex for Filter and Sorting Parameters
$unwanted_params = array(
    'filter_',
    'query_type_',
    'min_price',
    'max_price',
    'rating_filter',
    'orderby'
);

foreach ($_GET as $key => $value) {
    foreach ($unwanted_params as $param) {
        if (stripos($key, $param) !== false) {
            echo '<meta name="robots" content="noindex, follow">' . "\n";
            return;
        }
    }
}

}
add_action(‘wp_head’, ‘wp_noindex_unwanted_urls’);