This code will hide the WordPress editor bases on a custom template. Good if you're using your own fields. You can add this code snippet to your functions.php file in your child theme directory.

functions.php

<?php

add_action( 'admin_head', 'hide_editor' );
function hide_editor() {
    $template_file = basename( get_page_template() );
    if($template_file == 'template-name.php'){
        remove_post_type_support('page', 'editor');
    }
}