Remove the Width and Height Added to WordPress Images

When you’re making a site responsive you don’t want images to have a set width and height, so to remove these from your them you will…

Add this to your functions.php

/*
 * REMOVE WIDTH AND HEIGHT ON IMAGES
 *************************************************************/
add_filter( 'post_thumbnail_html', 'remove_width_attribute', 10 );
add_filter( 'image_send_to_editor', 'remove_width_attribute', 10 );

function remove_width_attribute( $html ) {
   $html = preg_replace( '/(width|height)="\d*"\s/', "", $html );
   return $html;
}