Janos Moga

This plugin provides lightweight securtiy enhancements to secure your WordPress website. However, this is not a security plugin––most of securtiy enhancements should be made on server level.
Following security enhancements are available: 
* Setting up security headers. 
* Disabling XML-RPC
The plugin also includes functions to clean code output.
Following cleaning enhancements are available: 
* Removing WordPress default SVGs.

Hardened Clean

Lightweight protection to and cleaning of your Wordpress website.

Antonio D.

Christodoulos Demetriou

This plugin adds a button on the tinyMCE editor toolbar. When editing a post, clicking on the “Clear all text style 
and formating button”, allows you to remove the text style and formating from the post content as well as the images.
NO Compatible with Gutenberg!
<h3>Disclaimers</h3>
The Simple clean content plugin is supplied “as is” and all use is at your own risk.

Simple clean content

Add a button on the tinyMCE editor toolbar, that by clicking it, removes all styling from the content of a post.

Hardened Clean vs Simple clean content