Install Dyanomic QR Code Generator WordPress. Its free plugin you can download from

https://wordpress.org/plugins/dynamic-qr-code-generator/

Install this plugin open the theme single.php and Page.php files

Add below code for getting automated QR code on verypage and every post of your website.

$id = get_the_ID();
the_content( );

echo do_shortcode(“[dqr_code post_id=”.$id.”]”);