4chan – How to bypass wordfilters

Using zero-width characters

There are several Unicode characters that don’t display anything but are used for special text-marking purposes. These can be used within a word so that it doesn’t match the filter. Some of these are as follows, listed between the “si” and “nep”:

sinep – Soft hyphen, character U+00AD (you can type this with Alt + 0173)
sinep – Zero width non-joiner, character U+200C
sinep – Zero width joiner, character U+200D
sinep – Left to right mark, character U+200E
sinep – Left to right embedding, character U+202A
sinep – Left to right override, character U+202D

There are others that work too. Also, the right to left markings can have an interesting effect on your posts.

Shamelessly stolen from 4chan.org