[BetterRed]

Originally Posted by Amaru

Is there a way to convert the documents on the Kindle itself directly?

Don't think so - but you would get a definitive answer in the Kindle forum.

Originally Posted by Amaru

edit: I tried a few documents converted from pdf to azw3, the readability is not much better, few are, some are not. Is there a useful method with calibre at all to make pdfs Kindle Paperwhite readable?

Converting PDF documents is a hit and miss affair, there is no single or best way to do it, see ==>> Read this before Posting PDF Questions.

And search the forums for "convert PDF", the topic has been discussed dozens if not hundreds of times at considerable length.

Also take a look at k2pdfopt: optimizes PDFs for viewing on e-readers

BR