Unicode Test Utility - This page checks to see if your browser supports the UTF-8 standard. It also tests the server for Unicode support.
 
The default testing text is a single heart symbol, and should appear in the output area and text box below. If it does not, then your browser probably does not support Unicode. If it does, click the Submit button to test the server's Unicode support. Alternatively, if you know how to enter Unicode characters, you may enter any Unicode character you wish into the text box below. If the output area contains the same text you entered, then the server supports Unicode.
 
This script also counts the length of the string in two forms - Unicode-safe counting, treating multibyte characters as one, and system counting, where each byte is counted. It is normal for these two to differ when using Unicode characters, as shown by the default testing text. 
Unicode Length (mb_strlen): 1
System Length (strlen): 3
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Caveats: This utility converts < and > into their HTML entities (&lt; and &gt;, respectively) and are thus counted as 4 characters. They are not Unicode. Currently, this script only supports UTF-8.