How to Create Custom Product Badges for Woocommerce?

// Display the Woocommerce Discount Percentage on the Sale Badge for variable products and single products
add_filter( 'woocommerce_sale_flash', 'display_percentage_on_sale_badge', 20, 3 );
function display_percentage_on_sale_badge( $html, $post, $product ) {

  if( $product->is_type('variable')){
      $percentages = array();

      // This will get all the variation prices and loop throughout them
      $prices = $product->get_variation_prices();

      foreach( $prices['price'] as $key => $price ){
          // Only on sale variations
          if( $prices['regular_price'][$key] !== $price ){
              // Calculate and set in the array the percentage for each variation on sale
              $percentages[] = round( 100 - ( floatval($prices['sale_price'][$key]) / floatval($prices['regular_price'][$key]) * 100 ) );
          }
      }
      // Displays maximum discount value
      $percentage = max($percentages) . '%';

  } elseif( $product->is_type('grouped') ){
      $percentages = array();

       // This will get all the variation prices and loop throughout them
      $children_ids = $product->get_children();

      foreach( $children_ids as $child_id ){
          $child_product = wc_get_product($child_id);

          $regular_price = (float) $child_product->get_regular_price();
          $sale_price    = (float) $child_product->get_sale_price();

          if ( $sale_price != 0 || ! empty($sale_price) ) {
              // Calculate and set in the array the percentage for each child on sale
              $percentages[] = round(100 - ($sale_price / $regular_price * 100));
          }
      }
     // Displays maximum discount value
      $percentage = max($percentages) . '%';

  } else {
      $regular_price = (float) $product->get_regular_price();
      $sale_price    = (float) $product->get_sale_price();

      if ( $sale_price != 0 || ! empty($sale_price) ) {
          $percentage    = round(100 - ($sale_price / $regular_price * 100)) . '%';
      } else {
          return $html;
      }
  }
  return '<span class="onsale perc">' . esc_html__( 'up to -', 'woocommerce' ) . ' '. $percentage . '</span>'; // If needed then change or remove "up to -" text
}

// New badge for recent products (archive)
add_action( 'woocommerce_before_shop_loop_item_title', 'new_badge', 3 );
          
function new_badge() {
   global $product;
   $newness_days = 30; // Number of days the badge is shown
   $created = strtotime( $product->get_date_created() );
   if ( ( time() - ( 60 * 60 * 24 * $newness_days ) ) < $created ) {
      echo '<span class="ct-woo-card-extra new-badge">' . esc_html__( 'NEW', 'woocommerce' ) . '</span>';
   }
}

// New badge for recent products on single product page
add_action( 'woocommerce_single_product_summary', 'new_badge_single_product', 1 );  
function new_badge_single_product() {
   global $product;
   $newness_days = 30; // Number of days the badge is shown
   $created = strtotime( $product->get_date_created() );
   if ( ( time() - ( 60 * 60 * 24 * $newness_days ) ) < $created ) {
      echo '<span class="itsnew">' . esc_html__( 'NEW', 'woocommerce' ) . '</span>';
   }
}

// Display featured product badge in Woocommerce archive page
add_action( 'woocommerce_before_shop_loop_item_title', 'featured_badge_on_archive_pages', 10 );
// add_action( 'blocksy:woocommerce:product-card:title:before', 'featured_badge_on_archive_pages', 1 );
function featured_badge_on_archive_pages() {
    global $product;
    
    // Is a WC product
    if ( is_a( $product, 'WC_Product' ) ) {
        // Get productID
        $product_id = $product->get_id();
        
        // Returns an array containing the IDs of the featured products.
        $featured_product_ids = wc_get_featured_product_ids();
        
        // Checks if a value exists in an array
        if ( in_array( $product_id, $featured_product_ids ) ) {
            echo '<span class="featured-badge">Featured</span>';
        } 
    }
}

<meta charset="utf-8">// Display featured product badge in Woocommerce single product page

add_action( 'woocommerce_single_product_summary', 'featured_badge_on_product_pages', 1 );
function featured_badge_on_product_pages() {
    global $product;
    
    // Is a WC product
    if ( is_a( $product, 'WC_Product' ) ) {
        // Get productID
        $product_id = $product->get_id();
        
        // Returns an array containing the IDs of the featured products.
        $featured_product_ids = wc_get_featured_product_ids();
        
        // Checks if a value exists in an array
        if ( in_array( $product_id, $featured_product_ids ) ) {
            echo '<span class="featured1">Featured</span>';
        } 
    }
}

// Step 1: Add checkbox 

add_action( 'woocommerce_product_options_general_product_data', 'checkbox_badge' );        
  
function checkbox_badge() {           
woocommerce_wp_checkbox( array( 
'id' => 'checkbox_badge', 
'class' => '', 
'label' => 'Display free shipping badge'
) 
);      
}

// Step 2: Save checkbox selection
  
add_action( 'save_post', 'save_checkbox_badge_selection' );
  
function save_checkbox_badge_selection( $product_id ) {
    if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
        return;
    if ( isset( $_POST['checkbox_badge'] ) ) {
            update_post_meta( $product_id, 'checkbox_badge', $_POST['checkbox_badge'] );
    } else delete_post_meta( $product_id, 'checkbox_badge' );
}

// Step 3: Display custom badge at single product page
  
add_action( 'woocommerce_single_product_summary', 'display_checkbox_badge', 7 );
  
function display_checkbox_badge() {
    global $product;     
    if ( get_post_meta( $product->get_id(), 'checkbox_badge', true ) ) {
        echo '
<div class="custom-badge-1">Free shipping</div>'; // Change this text if needed
    }
}

// Display Fields
add_action( 'woocommerce_product_options_general_product_data', 'woo_add_custom_fields' );

// Save Fields
add_action( 'woocommerce_process_product_meta', 'woo_add_custom_fields_save' );

function woo_add_custom_fields() {

  global $woocommerce, $post;
  
  echo '<div class="options_group">';
  
 // Display Woocommerce product badge box in product edit page
woocommerce_wp_text_input( 
	array( 
		'id'          => '_text_field', 
		'label'       => __( 'Badge text', 'woocommerce' ), 
		'placeholder' => 'Enter your badge text here',
		'desc_tip'    => 'true',
		'description' => __( 'Enter your badge text here', 'woocommerce' ) 
	)
); 
  echo '</div>';	
}
function woo_add_custom_fields_save( $post_id ){
	// Text Field
	$woocommerce_text_field = $_POST['_text_field'];
  if(!empty( $woocommerce_text_field )) {
	update_post_meta( $post_id, '_text_field', esc_attr( $woocommerce_text_field ) );
  } else {
	update_post_meta( $post_id, '_text_field', "" );
  }
}

// Display Woocommerce product badge with custom text in single product page
add_action('woocommerce_single_product_summary', 'display_custom_field_value', 7 );
function display_custom_field_value(){
  $value = get_post_meta( get_the_ID(), '_text_field', true);
  if(strlen($value) != null && strlen($value) > 0) {
	echo '<div class="custom-badge">'.get_post_meta( get_the_ID(), '_text_field', true ).'</div>';
  }
}