PDF is the worst file format for reading on eBook devices. However, you may try GoodReader or ReaddleDocs iPhone apps. They have a text reflow feature to extract and show only the text from the PDF file. Also, you may try this tutorial about how to convert PDF to ePub. Results depend entirely on the PDFs that you want to convert.
Use a 3rd party software will be the fastest and easiest way, just like Aiseesoft PDF to ePub converter, it provides powerful and professional functions, with it, you can convert PDF to ePub with super high quality.
To convert epub to pdf file you would need a tool. named epub to pdf converter, something like that.
At http://ebook.online-convert.com/convert-to-epub, you can easily convert pdf to epub for free. Just upload the file using their web form, and they convert it for you quickly and efficiently.
You can use Calibre to convert it to EPUB or PDF
It depends on what you want to convert it to. This website allows you to convert other file formats to the epud filetype: http://ebook.online-convert.com/convert-to-epub There is also this website which converts epub files to pdf files: http://www.convertfiles.com/convert/ebook/EPUB-to-PDF.html Both are free and do not require downloads.
There are so many E-book formats in fact, but the most popular one should be epub, you could try create Epub through calibre, it's free.
There are a lot of websites that converts pdf to epub. You can find them by searching or you can go to translate.com/form and hopefully they will have the feature available for you.
WREDSFF
About read kindle books on Kobo, we have to at first remove Kindle DRM from books and then convert Kindle format to pdf or epub.Then transfer those pdf or epub files to kobo devices with USB cable.
Sure, what you need is an 3rd party tool like PDF Converter or else which could convert your PDF to other format like word, ppt, xls, or epub something.
PDf, MP3 and EPUB
PDF and ePub formats are very popular with eBook readers. They each have outstanding features compared with other eBook formats. Some like to use ePub and eBooks, and some like to use a PDF format. Also a few eBook readers do not support ePub formats just like the Kindle device. Many eBook Converter lists are on download sites such as CNET, Softonic, Softpedia, etc. You can go to these sites or use Google search to find an eBook Converter that satisfies your requirements. See the related links for further information.
There are many file convertors offered online there are some free and some fee for downloads available. Read ratings and company safety before you download.