Confuse advertisers and government surveillance with lookalike letters.
This tool replaces randomly selected letters and digits from your input with lookalikes (Unicode confusables) from different languages. The end result is a string of characters that visually look similar to what you entered, but which get interpreted completely differently by a computer.
Using the output here in your Gmail, Facebook posts, etc. would have the likely effect of evading pattern-matching rules or keyword searching that some advertising or surveillance agencies may be engaged in. As with all Unicode characters, correct display depends on the correct font being available.