How to transfer iPhone contacts between cloud accounts?

CopyTrans Contacts allows you to transfer contacts between your iPhone, iCloud, Gmail and Yahoo. This means that you can easily copy local iPhone contacts to a cloud account as well as transfer contacts from one cloud account to the next (i.e. from iCloud to Yahoo or from Yahoo to Gmail, etc). You can do all this in a few clicks via using CopyTrans Contacts’ simple and integrated interface. All iPhone models, including the iPhone 6s, iPhone 7 and iPhone 7 plus are supported.

This is how to transfer iPhone contacts between cloud accounts

Download CopyTrans Contacts from the following page:
Download CopyTrans Contacts
Install the program. If you need help installing CopyTrans Contacts, please refer to this article.
Run CopyTrans Contacts and connect the iPhone, iPad or iPod Touch.
From the main program window, navigate to “More > Cloud setup”:
In order to be able to move contacts between cloud accounts, you would first need to connect each cloud account to CopyTrans Contacts. To do so, click “+ New connection” and then select iCloud, Gmail, Yahoo, or Custom:
Enter the credentials associated with your iCloud, Gmail or Yahoo accounts, make sure that the box next to “Contacts” it checked, and click “Add account”:

NOTE: If you experience trouble connecting a cloud account, please check this troubleshooting article for iCloud, this article for Gmail and this article for Yahoo.
Once you finished adding all the desired cloud accounts, close the “Cloud setup” window.
Let the program load all your iPhone and iCloud, Gmail or Yahoo contacts. Contacts sourced from iCloud are marked by a small cloud icon. Contacts sourced from Gmail and Yahoo are designated by the Gmail and Yahoo logos. Contacts without a logo to the right are entries which exist locally on the iPhone.
Let’s say you would like to transfer two of the local iPhone contacts to iCloud. To do so, select each contact by checking the box next to the entry. Right-click the selection and choose “Move to…”. Next, select your iCloud account from the list.
The two local contacts are now transferred to the iCloud account and removed from the phone memory. If you enabled iCloud contact sync on your iPhone, you would still see the contacts from within the device – this time – as sourced from iCloud.

NOTE: if you use the “Copy to…” feature instead, CopyTrans Contacts will essentially create a copy of the selected contacts to the cloud account of your choice and keep the original contact entries.
You can use the method described above to transfer contacts between any two cloud accounts or the local iPhone memory. For example, you can choose to move all local iPhone and Gmail contacts to iCloud, etc.