JS Morisset

A simple, safe, and reliable way to force HTTP URLs to HTTPS dynamically:
No setup required – simply activate the plugin to force HTTP URLs to HTTPS.
There are no plugin settings to adjust, and no changes are made to your WordPress configuration.
SIGNIFICANTLY FASTER than other popular plugins of this type:
Other well known plugins use <a href="https://secure.php.net/manual/en/function.ob-start.php" rel="nofollow ugc">PHP’s output buffer</a> to search & replace URLs in the rendered HTML, which is a technique that is error prone and negatively affects caching performance (as changes are not cached).
This plugin uses standard WordPress filters instead of PHP’s output buffer for maximum reliability, performance, caching compatibility, and uses 301 permanent redirects for best SEO results (<a href="https://en.wikipedia.org/wiki/HTTP_301" rel="nofollow ugc">301 redirects are considered best for SEO when moving from HTTP to HTTPS</a>).
Supports advanced proxy / load-balancing HTTP headers:
<ul>
<li><code>X-Forwarded-Proto</code> (aka <code>HTTP_X_FORWARDED_PROTO</code> server value)</li>
<li><code>X-Forwarded-Ssl</code> (aka <code>HTTP_X_FORWARDED_SSL</code> server value)</li>
</ul>
See <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-Proto" rel="nofollow ugc">Web technology for developers > HTTP > HTTP headers > X-Forwarded-Proto</a> for more details.
<h4>Plugin Requirements</h4>
Your web server must already be configured with an SSL certificate and able to handle HTTPS connections. 😉

JSM Force HTTP to HTTPS / SSL – No Setup, Fast and Reliable

No setup required - simply activate to force HTTP URLs to HTTPS using native WordPress filters and permanent redirects for best SEO.

webaware

Clean up your WordPress website’s HTTPS insecure content and mixed content warnings. Installing the SSL Insecure Content Fixer plugin will solve most insecure content warnings with little or no effort. The remainder can be diagnosed with a few simple tools.
When you install SSL Insecure Content Fixer, its default settings are activated and it will automatically perform some basic fixes on your website using the Simple fix level. You can select more comprehensive fix levels as needed by your website.
WordPress Multisite gets a network settings page. This can be used to set default settings for all sites within a network, so that network administrators only need to specify settings on sites that have requirements differing from the network defaults.
See the <a href="https://ssl.webaware.net.au/" rel="nofollow ugc">SSL Insecure Content Fixer website</a> for more details.
<h3>Translations</h3>
Many thanks to the generous efforts of our translators:
<ul>
<li>Bulgarian (bg_BG) — <a href="https://translate.wordpress.org/locale/bg/default/wp-plugins/ssl-insecure-content-fixer" rel="nofollow ugc">the Bulgarian translation team</a></li>
<li>Chinese simplified (zh_CN) — <a href="https://translate.wordpress.org/locale/zh-cn/default/wp-plugins/ssl-insecure-content-fixer" rel="nofollow ugc">the Chinese translation team</a></li>
<li>English (en_CA) — <a href="https://translate.wordpress.org/locale/en-ca/default/wp-plugins/ssl-insecure-content-fixer" rel="nofollow ugc">the English (Canadian) translation team</a></li>
<li>English (en_GB) — <a href="https://translate.wordpress.org/locale/en-gb/default/wp-plugins/ssl-insecure-content-fixer" rel="nofollow ugc">the English (British) translation team</a></li>
<li>English (en_ZA) — <a href="https://translate.wordpress.org/locale/en-za/default/wp-plugins/ssl-insecure-content-fixer" rel="nofollow ugc">the English (South African) translation team</a></li>
<li>Dutch (nl_NL) — <a href="https://translate.wordpress.org/locale/nl/default/wp-plugins/ssl-insecure-content-fixer" rel="nofollow ugc">the Dutch translation team</a></li>
<li>German (de_DE) — <a href="https://translate.wordpress.org/locale/de/default/wp-plugins/ssl-insecure-content-fixer" rel="nofollow ugc">the German translation team</a></li>
<li>French (fr_FR) — <a href="https://translate.wordpress.org/locale/fr/default/wp-plugins/ssl-insecure-content-fixer" rel="nofollow ugc">the French translation team</a></li>
<li>Italian (it_IT) — <a href="https://translate.wordpress.org/locale/it/default/wp-plugins/ssl-insecure-content-fixer" rel="nofollow ugc">the Italian translation team</a></li>
<li>Japanese (ja) — <a href="https://translate.wordpress.org/locale/ja/default/wp-plugins/ssl-insecure-content-fixer" rel="nofollow ugc">the Japanese translation team</a></li>
<li>Russian (ru_RU) — <a href="https://translate.wordpress.org/locale/ru/default/wp-plugins/ssl-insecure-content-fixer" rel="nofollow ugc">the Russian translation team</a></li>
<li>Spanish (es_ES) — <a href="https://translate.wordpress.org/locale/es/default/wp-plugins/ssl-insecure-content-fixer" rel="nofollow ugc">the Spanish translation team</a></li>
</ul>
If you’d like to help out by translating this plugin, please <a href="https://translate.wordpress.org/projects/wp-plugins/ssl-insecure-content-fixer" rel="nofollow ugc">sign up for an account and dig in</a>.
<h3>Privacy</h3>
SSL Insecure Content Fixer does not collect any personally identifying information, and does not set any cookies.

SSL Insecure Content Fixer

This plugin is very helpful in making sure that a WordPress site will load fully in HTTPS.

This Plugin Does EXACTLY as it says - GREAT WORK!

Clean up WordPress website HTTPS insecure content

JSM Force HTTP to HTTPS / SSL – No Setup, Fast and Reliable vs SSL Insecure Content Fixer