Tons of question marks?

[curstpriest]

You have to correctly specify the encoding format, you can't just "use utf-8" if the source isn't utf-8. Find out what the source encoding is, and tell your conversion program (like calibre or whatever) to encode with that specific encoding when you convert the file.

Make sure it's not some strange dos/ansi encoding (windows), if it is, specify this encoding.
Though most text uses ISO/IEC 8859-1, or ISO/IEC 8859-2, ISO/IEC 8859-3, etc

[Bittybye]

I had the same problem I had a fanfiction that I wanted converted, but when I opened it on my Kindle, instead of quotes I had the little question marks in a box.

[Belle2Be]

Originally Posted by TenaciousBadger

usually, in my experience, the little square thing or other annoying characters that don't belong there, replace quotation marks and question marks or apostrophes.
i just export the document (or convert it) to a word/open office document where i perform a search and replace by selecting the irritant and replacing all with what's supposed to be there. (this, in the case where all ", ', or ? or etc are replaced by the same annoying character)

hope it makes sense

Ooh that's a great idea!