One of the easiest methods is to use Google Docs to do the conversion from PDF to Word.
Once you’ve finished with a Google Docs document, you can turn it into a PDF very easily. Simply click File > Download > PDF. There are also many options here for other file formats, including plain text (.txt), an EPUB publication (.epub) and a Microsoft Word file (.docx).
You can also do it the other way around by uploading a .PDF file to your drive, and then clicking it to open the preview, and click Open With Google Docs. The result you get in Google Docs will depend on how the .PDF file was created, but sometimes you will be able to edit the text within the PDF and also edit other elements.
Sometimes, the import may just show up as a blank page. This usually happens if an image has been converted to a PDF. After you’ve finished with editing, just click File > Download and choose a suitable file type.