biscuitbaby

KBSP Spacer & Ad Blocks lets you easily insert preset blank spaces (1 or 2 lines) and a single ad placeholder (banner1) into your posts and pages. 
It works with both the Classic Editor and the Block Editor.
In the free version you can use the following: 
* Blank spaces with 1 or 2 line presets. 
* One ad placeholder block.
A Pro version offers additional features such as custom heights and multiple ad placeholders. 
Get the Pro version at: https://biscuitbaby.gumroad.com/l/blankblockpro?wanted=true
<h3>Blocks</h3>
This plugin provides 2 blocks.
<ul>
<li>Blank Space </li>
<li>Ad Placeholder</li>
</ul>
<h3>Upgrade</h3>
Want more features? 
The Pro version includes custom spacing heights and multiple ad placeholders. 
Available here: https://biscuitbaby.gumroad.com/l/blankblockpro?wanted=true

KBSP Spacer & Ad Blocks

Easily insert customizable blank spaces and ad placeholders into your posts and pages.

cottboy

WordPress by default omits consecutive spaces and leading/trailing spaces. KeepSpace can automatically convert regular spaces to special character spaces to prevent them from being omitted.
Main functions:
<ul>
<li>Automatically convert regular spaces into special-character spaces</li>
<li>Supports four independent toggles for title, excerpt, content, and comments</li>
<li>Provides three types of special space characters to choose from</li>
</ul>
Three types of special space characters:
<ol>
<li>
Non-breaking space (\u00A0) – Recommended
<ul>
<li>Same visual effect as  </li>
<li>Counts as only 1 character and does not affect excerpt truncation</li>
</ul>
</li>
<li>
Chinese full-width space (\u3000)
<ul>
<li>In a Chinese environment, it’s very natural</li>
<li>The width is exactly one Chinese character</li>
</ul>
</li>
<li>
HTML Entity Space ( )
<ul>
<li>Best compatibility, supported by all browsers</li>
<li>Counting 5 characters will affect the summary extraction</li>
</ul>
</li>
</ol>

KeepSpace

Automatically convert regular spaces into special character spaces to prevent them from being omitted.

KBSP Spacer & Ad Blocks vs KeepSpace