This page performs all processing in your browser. It doesn't send anything anywhere. It does not depend on a server. You can save it on your PC and it will still work.
Supports Russian and English as a source. Any hyphenation signs or non-conventional characters (outside basic Latin and Cyrillic) will be left untouched.
Has reproducible behavior: the same input text will always result in the same rubbish (in fact, chooses characters from the substitution table according to word number + character position, there is no randomization of any sort)