Looks like the Great Firewall or something like it is preventing you from completely loading www.skritter.com because it is hosted on Google App Engine, which is periodically blocked. Try instead our mirror:
This might also be caused by an internet filter, such as SafeEyes. If you have such a filter installed, try adding appspot.com to the list of allowed domains.
Skritter can automatically go between simplified and traditional characters for any given word or list of words. To do this, a mapping of simplified to traditional characters is kept and maintained (though rarely updated). Any character not on this list is assumed to be the same in either system. Use this endpoint to access this mapping for advanced features, like: