How to Remove the Width and Height Attributes From WP Image Uploader

How to Remove the Width and Height Attributes From WP Image Uploader

When you upload images via WordPress image uploader and insert it into your posts, WordPress automatically include the image width and height attributes in the html <img> tag. But when using a responsible theme, this can cause lots of trouble. Here’s a quick recipe to get rid of those attributes.

Simply paste the following code into your theme functions.php:

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;
}

Thanks to Damien for the cool hack!