WordPress: Remove width and height attributes of inserted images

When you upload an image through the WordPress media uploader and then insert it into the editor, it will have width and height attributes by default. If you want to remove the default width and height attributes, add the following code to your functions.php file.

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;
}

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