Andrea Ercolino

Full UTF-8 adds complete support for any UTF-8 character. 
Without this plugin, WordPress truncates anything after the first 4-bytes-long UTF-8 character.
Suppose you copy some text from a web page and paste it into the editor. You see 
everything is fine, so you hit save. As soon as the page is reloaded, you find out that your post 
has been truncated at a point that seems to be quite random. Well, that’s not random. 
The breaking point is the position of the first 4-bytes-long UTF-8 character. 
Anything from that one up to the end of the post is irremediably lost forever.
You definitely need to install this plugin if you write 4-bytes-long UTF-8 characters. 
How do you know that? Many Chinese characters, musical and mathematical symbols and Emoji icons 
are 4-bytes-long. But you can always <a href="http://shapecatcher.com/" rel="nofollow ugc">try to draw something</a> and check for yourself. 
If you get a Unicode hexadecimal value with more than four digits after 0x then it is a 4-bytes-long UTF-8 character. 
For example, a <a href="http://shapecatcher.com/unicode/info/119070" rel="nofollow ugc">G-clef</a> is one because 0x1D11E has 5 digits after 0x. 
1. This plugin is a WordPress “drop in”. Drop-ins are advanced plugins in the wp-content 
directory that replace WordPress functionality when present. 
1. This plugin is completely automatic. You are not supposed to do anything special 
to make it work after activating it.
<h4>Interesting Links</h4>
<ul>
<li><a href="http://www.smashingmagazine.com/2010/05/18/the-beauty-of-typography-writing-systems-and-calligraphy-of-the-world/" rel="nofollow ugc">Beauty of Writing Systems</a></li>
<li><a href="http://rishida.net/docs/unicode-tutorial/part1" rel="nofollow ugc">Complexity of Writing Systems</a></li>
<li><a href="https://the-pastry-box-project.net/oli-studholme/2013-october-8" rel="nofollow ugc">What is UTF-8?</a></li>
</ul>

Full UTF-8

Trustfully write anything in your language. Stop worrying about truncated content.

ktsvetkov

This plugin is designed to “fight” the broken UTF8 
characters on your WordPress powered site.
Install the UTF8 Sanitize WordPress plugin and you 
will be able to fight those ugly characters. Additionally, you can customize 
what actions you want to perform on them – either convert them to their original 
values once and for all by modifing your posts’ database, OR leave all 
your posts intact and instead convert the ugly chars each time a post is loaded 
(all these options are controlled from the WordPress admin panel).

UTF8 Sanitize

This plugin is designed to handle the broken characters that might appear on your blog posts, if their content is converted from/to UTF8 and ISO-8859- …

Full UTF-8 vs UTF8 Sanitize