Scott Weaver

Puts a drop-down under your post title titled “Change Case,” which gives you three options:
<ol>
<li>Title Case</li>
<li>Lowercase</li>
<li>Uppercase</li>
</ol>
Selecting any of these options will immediately change the title text you have entered according to the selected setting.
<h4>Tags</h4>
title, titlecase, title case

TDLM Title Case

Change your post title to correct title case or all lowercase or all uppercase.

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Automatically converts post and image titles to title case upon activation. There is no admin page or settings to adjust for this plugin.
<h3>What is title case?</h3>
Title case would convert any of the following:
Let’s go to the market 
Let’s Go To The Market 
let’s go to the market 
LET’S GO TO THE MARKET *(except for this scenario, see below)
to:
Let’s Go to the Market
<a href="https://github.com/webguyio/list-of-article-words" rel="nofollow ugc">List of Article/Minor/Short Words</a> | <a href="https://github.com/webguyio/list-of-acronyms" rel="nofollow ugc">List of Acronyms</a>*
*Originally, I had coded this in a way to handle acronyms so that “LET’S GO TO THE MARKET” titles could be converted to title case (note that acronyms are automatically preserved in all other cases as long they’re already in uppercase). However, it wasn’t very ideal. A bad solution for an extremely rare problem. So, if you have the rare problem of having all uppercase titles that need to be converted, I can still help with a custom/manual solution, but I decided against it being in the plugin officially.
<h3>Additional Notes:</h3>
<ul>
<li>Once activated, titles are updated passively as content is visited, rather than all at once. This is intentional as bulk-updating thousands of posts, pages, and media simultaneously could time out or crash the server on large sites.</li>
<li>For new image uploads, the titles and alts will be generated from the filename. This, along with using properly keyworded filenames, is good for SEO. Bad: DSC_0001.JPG. Good: lets-go-to-the-market.jpg.</li>
<li>Currently only supports English. Non-english titles will convert all words to having their first letter capitalized (Vamos Al Mercado). With enough demand, and maybe some help, additional languages could be supported.</li>
<li>For most use-cases, this plugin should probably be considered as a temporary utility plugin only, and not left running indefinitely.</li>
</ul>

Auto Title Case

Automatically converts post and image titles to title case.

TDLM Title Case vs Auto Title Case