Michael Aronoff

This plugin solves one of my greatest annoyances. Quickly changing the case of selected text. Clients often send text with all caps or no caps and clicking through a ton of text to fix the case is often tedious work. I created this simple but effective plugin to eliminate that chore.
Based on a request I have added a fourth button to add Sentence Case as well. So if you have a large block of text with . ? or ! between sentences it will Cap only the first letter of each sentence.
There is an Options Page to enable or disable any of the buttons.
NEW 
I have also added keyboard shorcuts! 
Ctrl+Shift+L = Lowercase 
Ctrl+Shift+U = Uppercase 
Ctrl+Shift+S = Sentence Case 
Ctrl+Shift+T = Title Case 
(I do not own a mac to test on but command should work according to the TinyMCE documentation)
<h3>Usage</h3>
Highlight the text to be changed. Click the Visual Editor button inside your post/page for the desired effect:
<ul>
<li>UC – Changes selected text to all Uppercase.</li>
<li>lc – Changes selected text to all lowercase.</li>
<li>Sc – Changes selected text to all Sentence case.</li>
<li>Tc – Changes selected text to all Title case.</li>
</ul>

Change Text Case

Works As Advertised

Title case is not AP style title case. It caps every first letter in sentence.

Not AP Title Case

Change Case adds buttons to change text case in the WordPress visual editor.

rsantor

This plugin will automatically parse through the contents of each blog post and/or comment when displayed and look for bad casing and other common grammatical/aesthetic faux pas, like sloppy punctuation. It will also make blog post titles all uppercase except for select words, which are kept lowercase. Double and single quotation marks, as well as commas, are automatically made into their attractive curly form. You can also provide a custom list of tweaks you’d like the plugin to make, such as uppercasing select words or disabling some of the plugin’s default replacements.
For example, consider the following text as a comment’s contents: 
 AMAZING!!!!! THIS IS SUCH AN AMAZING STORY AND I KNOW MY FRIEND,, DR. BOBBY WOULD THINK SO TOO… DON’T YOU AGREE???!!!
The default functionality of the Text Beautify plugin would display that content as follow: 
 Amazing! This is such an amazing story and I know my friend, Dr. Bobby would think so too… Don’t you agree?!
The full feature list is as follows:
<ul>
<li>Use proper sentence casing instead of all capitals in comments and post body</li>
<li>Capitalize each word in blog titles except for user-editable list of exceptions</li>
<li>Remove user-editable list of excessive punctuation; by default: exclamation marks, question marks, asterisks, commas</li>
<li>Replace standard quotation marks, apostrophes, and commas with their curly equivalents</li>
<li>Preserve case (in blog posts, blog titles, and comments) of user-editable list of terms</li>
<li>Execute user-editable list of specific string replacements (in blog posts, blog titles, and comments)</li>
</ul>

Text Beautify

Cleans up posts and comments for sentence case or title case, fixes punctuation, makes quotes and commas curly, and allows custom enhancements.

Change Text Case vs Text Beautify