Use PureDevs WP locker To safeguard your entire WordPress site, by using a single password.
Only the visitors who know your password would be able to access your WordPress site.
This plugin is just what you need if you're setting up a developmental version of your WordPress site or if your website is going through a major revamping and your website is simply off-limit from the general public or the known bots.
After activating the plugin, head over to Settings> PureDevs WP Locker> Set Password to set a site-wide password.
Note: When a user enters a password, their IP is saved both on cookie and in database table as future login credentials.
Optional: Form heading: Clarify to visitors the reason for locking your website and provide clear guidance on the next steps to take. Button Label: customize the text on your password submission button.