
If you want to transfer the e-books to other devices or convert e-books to other format, just use the best ebook manager & converter--- Calibre. Calibre is a freeware which can convert e-books from one format to another with ease.
Question 1 What input formats does Calibre support?
Calibre supports the following input formats: CBZ, CBR, CBC, CHM, EPUB, FB2, HTML, LIT, LRF, MOBI, ODT, PDF, PRC, PDB, PML, RB, RTF, SNB, TCR, TXT.
Question 2 What output formats does Calibre support?
The supported output formats include EPUB, FB2, OEB, LIT, LRF, MOBI, PDB, PML, RB, PDF, SNB, TCR, TXT.
Step 1: Download & install Calibre.
Tips:
Step 2: After successfully installing the best ebook converter--Calibre , launch it.
This is the main interface of the Calibre ebook converter.
Step 3: Add your ebooks to library.
You can either drag and drop the books to the Calibre main interface or click "Add books" and then navigate to the folder stored your ebooks to add ebooks to Calibre. When you add a new book, it will appear at the top of the list of books.
Step 4: Select ebook on center menu list, click "convert books" to process converting.
A ebook converting window will pop, choose your Output format and set the output books, it's easy and user-friendly.
The output is list all the book types, like ePUB,FBZ,HTMLZ,LIT,LRF,MOBI,PDB,PDF,TEXT etc
After configuring the conversion settings, click 'OK' to start the conversion process. The pop-up window will close and the conversion process will begin.
If you're not paying close attention, you may not notice any immediate changes to the main window, and may be unsure when the conversion process will be finished.
To monitor the progress of the conversion, look at the bottom-right corner of the screen. You will see a 'Jobs: 1' status, which indicates that the conversion job is in progress."
When the conversion process is complete, the status will change to 'Jobs: 0'.
You may notice that there is now a section labeled 'Formats: EPUB, PDF'. These are the different file types for the converted book.
Step 5: To locate the converted files, click 'Click to open'. This will open the folder where the converted files are saved."
Note:
If the the above notification pops up during the conversion, it means that book will be DRM protected. In this case, you will have to install calibre DRM removal plugins to strip DRM from the books. And then add those drm free books to calibre again to convert formats.
If you want drm-removing much easier, here I highly recommend a powerful calibre alternative -- Epubor Ultimate-- all-in-one tool that combines drm removal with formats converter.
If you've downloaded Epubor Ultimate, read and get benefits from the following guides.
- Kindle DRM Removal
- Sony / Kobo / Google EPUB & PDF DRM Removal (ADE DRM Removal)
- Nook DRM Removal
Pro step 6: send ebook to device with Calibre
Once the books has converted successfully, connect the device to your computer and right click the book. From there, hover over 'Send to Device' and select 'Send to Main Memory'.

Ada Wang works for Epubor and writes articles for a collection of blogs such as ebookconverter.blogspot.com.
Hi, there
Sorry for the inconvenience.
Hopefully you will find a much better solution.
Regards.
Thank you for your help.
Hi, Nagraj
Does calibre show anything like "DRM protected" or other info?
If that PDB is purchased from eReader, it is likely to be DRM protected, which will have to be DRM stripped before the conversion.
Refer to this post for more details:
www.epubor.com/how-to-convert-pdb-to-pdf.html
thanks!
Calibre is an amazing piece of software, it is a powerful conversion tool that allows you complete control over the output of your book. That being said, I understand that some people may have trouble getting started with all the options in the conversion process. I suggest you check out the wealth of "How to's" and "Tips and Tricks" online. Calibre's site has a downloadable manual along with online step by step instructions, another site to check out is the MobileRead Forums. I was overwhelmed myself at first, however, I can assure you that if you put some time into learning the program you will come to appreciate how much it really kicks Arse! Btw, pdf's are really difficult to convert correctly because the are basically an image file.
Me and my friend are working on a little project, Converter central, a tool for converting many different things such as units and clothes. We have recently been considering to add a similar feature as you are describing for converting PDFs and other eBook formats, but in a much more lightweight version with only the most basic options. I wanted to ask you in person, which formats do you feel are the most relevant to convert between? And is there any particular option you think is more useful? I respect totally if you don't have time to give any feedback, and that's fine, but if you do I'd love to hear your thoughts :)
If you would like me to critique an item or book I would like the distraction.
Thank You
Dora
If you can't get expected result than it is not SW for you - you have to dive deep into settings to get better result, and i fixed some pretty messed up PDFs. In most cases bad result means that the source is s***, not that SW is bad.