Use an online PDF to EPUB converter
Upload the PDF file
Select EPUB as the output format
Start the conversion
Download the EPUB file
Use desktop software such as Calibre
Open Calibre
Add the PDF file
Choose Convert books
Set the output format to EPUB
Run the conversion
Save the EPUB file
Use Adobe Acrobat with a conversion tool
Use command-line tools such as Calibre or Pandoc
Check the EPUB file in an e-reader app
Fix formatting if needed before conversion