Backing up iPhone 4 contacts to google contacts

[01steven]

I have an iPhone 4 which has 298 contacts
I have a gmail account which has 112 contacts

I want to get the iPhone contacts into my gmail contacts.
I'm not concerned about getting my gmail contacts onto my iPhone.

Using iTunes there is the 'sync contacts with Google Contacts' option.
What happens if I use this?
Do I get the new merged dataset both on the iPhone and in Google?
Or will it overwrite the contacts on the iPhone with the pre-existing Google contacts?

Perhaps there is an easy way to export the iPhone contacts as a CSV and then upload into Google?

Hoping someone can help!
Thanks.

 

[benhollberg]

If you setup your Google account on your Mac or iPhone then it will ask to merge to information on device and your Google account. Just merge it.