I’ve found a solution : // Remove <img> title attribute in // http://wordpress.org/support/topic/wp_get_attachment_image_attributes-filter-not-working function remove_img_title($atts) { unset($atts[‘title’]); return $atts; } add_filter(‘wp_get_attachment_image_attributes’,’remove_img_title’, 10, 4); // remove title attribute from <a> title attribute in // modified from this post : http://oikos.org.uk/2011/09/tech-notes-using-resized-images-in-wordpress-galleries-and-lightboxes/ function ah_get_attachment_link_filter( $content ) { $new_content = preg_replace(‘/title=\'(.*?)\”https://wordpress.stackexchange.com/”, ”, $content ); return $new_content; } add_filter(‘wp_get_attachment_link’, ‘ah_get_attachment_link_filter’, … Read more