How to decrypt an encoded theme

This was originally posted by Otto42 in this thread –

Hopefully this will help some people, and avoid posts to the forum about encrypted theme files. Use these tools to decode them yourself.

Better yet, avoid encrypted themes entirely. They’re always malicious in some fashion. There is no legitimate reason for a theme author to encrypt a theme file.

This site, made by Sucuri.net, will decode most forms of encrypted code:
https://ddecode.com/phpdecoder/

This page will let you decode encryption that looks like $o=whatever:
https://ottodestruct.com/decoder.php

Otto based the interface for it off of this one, which will decode the type of encryption that starts with $_F=__FILE__:
https://www.tareeinternet.com/scripts/byterun.php

Otto also created this one, for encoded files that start with $OOO0O0O00=__FILE__;$O00O00O00=__LINE__;:
https://ottodestruct.com/decoder2.php

Another one is here, for those that look like eval(gzinflate(base64_decode('...')));:
https://www.tareeinternet.com/scripts/decrypt.php

Please, before asking for someone to decode an encrypted theme, actually try it out yourself first through the sites above.