Text obfuscation is not about changing "a" to "à" as it becomes revertable easily (like we see at obfuscator.uo1.net). Spellfucker's method uses random replacements which makes the reverting process more difficult. The cool thing is that the text still stays readable.
https://spellfucker.com/
or
https://github.com/igorpavlov/spellfucker
https://spellfucker.com/
or
https://github.com/igorpavlov/spellfucker