Quote:
Originally Posted by JSWolf
Converting ePub > ePub is a really bad idea. If you have an issue with these ePub, use Sigil to fix them the tweak program to go in and make the changes.
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disagree, sometimes it can take a very long time to manually locate an obscure glitch via sigil, whereas epub to epub is often a very fast quick fix. it is very good e.g. at regularising margins & stripping irrelevancies from css. it is also the only practical way to quickly break a single large xhtml into chapter sized chunks