This task (the reverse of [[URL encoding]]) is to provide a function or mechanism to convert an URL-encoded string into its original unencoded form.

'''Example'''

The encoded string "<code><nowiki>http%3A%2F%2Ffoo%20bar%2F</nowiki></code>" should be reverted to the unencoded form "<code><nowiki>http://foo bar/</nowiki></code>".