Improve Security with Really Simple SSL Pro

Really Simple SSL for WordPress Multisite

WordPress Multisite allows developers to manage large numbers of subsites via a single WordPress Multisite installation. To meet the requirements of WordPress Multisite users, we have developed a dedicated Multisite plugin. The plugin is included in all Agency packages (>25 licenses).

You will need one license key per WordPress installation. This includes Multisite installations with multiple subsites.

Due to the differences between regular WordPress environments and Multisite installations, unfortunately the regular Really Simple SSL Pro plugin doesn’t work on Multisite installations.

The Dedicated Multisite plugin tailors security and SSL configuration to fit Multisite environments.


25 Domains
  • HSTS Preload List
  • Security HeadersEasy implementable security headers: X-Content-Type-Options, X-XSS-Protection, X-Frame-Options, Certificate Transparency, No Referrer When Downgrade header, Content Security Policy, Upgrade Insecure requests.
  • Mixed content Fixer ProMixed content fixer for the back-end​ and an Extensive scan which enables you to detect the source of mixed content that couldn't be fixed automatically, with fix button​
  • HTTP Strict Transport Security
  • Advanced Hardening Features
  • Vulnerability Measures
  • Premium Support
  • Includes Multisite PluginA separate multisite plugin is bundled with the agency unlimited license.

Do you manage more than 25 websites?

Discover the possibilities for Agencies!

5/5 out 7000+ reviews
Use it everywhere!
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I’ve been using this plugin on all of my client’s websites for years and have never had an issue. Thank you for making my job easier! 😉
The Support is AWESOME!
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I can recommend any person to purchase this plug-in. The support is absolutely AMAZING!!!!!!!!!!!!!!
Really Simple is Awesome
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Really Simple is the perfect name for this plugin. It’s truly really simple. It’s been a totally hassle-free and easy experience.

Secure & Risk Free

Although we don’t think you’ll ever want one, we’ll gladly provide a refund if it’s requested within 30 days of purchase. No questions asked.


If your license is activated, you should be able to update from the WordPress plugins dashboard. If this doesn’t work, there’s probably a configuration issue on your server. We’ve listed several of the most common causes.

Sure! Just go to your account, then click “view licenses”, then “view upgrade”. There you have options to pay the additional amount. If you upgrade from single site to 5 sites, the difference is 40 dollars. But if only half a year is left on the license, you only need to pay 17 dollars for the upgrade of course!

The download link you received in the initial e-mail is valid for 24 hours. After the link has expired you can log in to your Really Simple SSL account to download the plugin again. When logged in to your account you will see the following:

Clicking on the ‘View Details and Downloads’ button will take you to a new page. On this new page scroll down to locate the ‘Products’ section. In the products section you can click on the plugin hyperlink to download the plugin, as shown in the screenshot below:

To install the plugin, you can follow these instructions

When you purchase one of our plugins an account is created automatically. You can reset your password here

If you don’t remember the email you used for the purchase, or did the purchase before the automatic account creation was activated, please contact us and we’ll set it up for you. 

You can create a new password via the following link:

Installing the free version of the plugin is done via the WordPress plugins overview. In WordPress, go to ‘Plugins’, click on ‘Add new’ and type ‘Really Simple SSL’ in the ‘Search Plugins’ search box. Really Simple SSL will show in the results. Pressing the ‘Install now’ button will install the plugin, pressing ‘Activate’ will activate the plugin.

After activating the plugin, the plugin does some checks on your site. Then you can click “Activate SSL”. Before pressing this button make sure your website has a valid certificate. This can be tested at the Qualys SSL Labs SSL Test.

See the following article for more information about installing the pro plugin:

Deactivating Really Simple SSL will revert your site back to http://. It is possible to deactivate Really Simple SSL and keep SSL, see the following article for more information:

When getting a ‘this email is not authorized to renew license’ error, try clearing cookies from your browser. That will likely solve the issue.

If you click the download link after you have purchased a plugin, you should download a zipped file which you can upload to WordPress. If this is not the case, you are probably using Safari. This is easy to fix. Go to:

Safari > Preferences > General > Open “safe” files after downloading: uncheck.