Where is the truly-semantic web when we need it? More specifically, where do I find an ONLINE TOOL (not! an application to download first, even a free one) which will perform fairly straightforward character-string substitution on uploaded files, e.g. changing UTF-8-char-encoded HTML into ISO-8859-n encoded file? Not to mention a functional equivalent of the Unix 'sed' applied to source- OR screen-scrapped text of selected web pages....

I've undertaken great many searches for the combinations of applicable keywords, such as (for first xample above) "converter," "online[.tool]," and "charset" without coming anywhere near a working solution....
http://google.com/search?q=convert+character.encoding+online.tool

And yet, I refuse to believe that no such tools have been created and posted online.... they seem such no-brainers, CS undergraduate course fodder. So where does Google hide them? ;-))

Google is pretty smart.
But I'm smarter.
"Webtool" did the trick.

http://www.webutils.pl/index.php?idx=conv