There are a number of standalone iOS apps and computer programs which can help you sync iPhone notes across the rest of your iOS devices. I have come across this program which lets you export iPhone notes to your computer or import notes from your PC to your iPhone:
For example, to export your iPhone notes, run the program on your computer, and connect your iPhone. Your iPhone notes will show up in the tool's open window.
Click on the Export selected
Here is a quick tutorial video about importing and exporting iPhone contacts: