First of all, free download and install the PDF to EPUB Converter. Launch the program and you will see the following interface:
Step 1: Import PDF Files to Program
Step 2: Customize the Output EPUB EBooks
you can import up to 50 multiple PDF files to the PDF converting program and convert them at one time. By click " PDF converter>preference", you can customize the output epub ebook format and make book cover. That's really powerful yet easy to use.