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.

Ryan McCue

Automatically convert post titles on-the-fly, using 
<a href="http://camendesign.com/code/title-case" rel="nofollow ugc">Kroc Camen’s port</a> of 
<a href="http://daringfireball.net/2008/05/title_case" rel="nofollow ugc">John Gruber’s title case</a>. All 
most all of the code was written by Kroc Camen, so he deserves the credit. 
Credit also to David Gouch and John Gruber, who wrote the 
<a href="http://individed.com/code/to-title-case/" rel="nofollow ugc">Javascript port</a> and original Perl 
versions respectively.

To Title Case

Automatically convert post titles on-the-fly, using Kroc Camen's port of John Gruber's title case.

Change Text Case vs To Title Case