How to Transfer Photo from Mac to iPhone

I want to copy a few photos from my Mac to my wife's iPhone, but it is not the one normally synced with my Mac. How do I do this without destroying the photos or pictures she already has on her iPhone?
This is surely a normal question for iPhone users. Maybe it has annoyed many people for a long time. As we all know, you will possible fail of copying photos from Mac to iPhone or erasing everything on your iPhone. In order to transfer photos from Mac to any iPhone freely and safely, you can use iPhone to Mac Transfer software. It enables you to transfer photos from Mac to iPhone very fast and without lost anything. This article focuses on introducing everybody who is interested in this software the operating process of it.

Instructions: How to Transfer Photo from Mac to iPhone?

Part 1: Transfer Photos from Mac to iPhone with iTunes 

Transferring photos from Mac to iPhone with iTunes requires that you have your iPhone attached to your Mac using a cable.
Then you just run iTunes and follow the steps below:
1) In Mac, create a folder with the photos you want to transfer.
2) In iTunes, press your device name and switch to the "Photos" tab in the right panel.
3) Choose the folder you just created.

Part 2: Transfer Photos from Mac to iPhone without iTunes (iPhone to Mac Transfer)

Step 1: Connect iPhone to Mac Free download and launch iPhone to Mac Transfer software, and connect your iPhone with Mac. And all iPhone item folders such as Music, Movie, Photo, Books, etc. are displayed in the left panel.
Step 2: Choose photo from Mac local
1) Save the camera photos on Mac local, and remember the save path.
2) In the software screen, turn to the top toolbar and click "Add Files to iPhone" or "Add Folder to iPhone" button to choose photos from Mac local. Maybe you can click the "File" top menu and choose "Add files to iPhone" option to start to select photos from Mac.
Step 3: Copy photos to iPhone
After you click "Add file to iPhone" button, there will be dialog window pops up, you should select photo files or folder and check them completely. When it is done, press "Open" button to start to copy photos to iPhone library. Besides you copying photos to iPhone, it can also copy Audio, Video, Books, etc. to iPhone library. Also you can transfer iPhone files to PC local for backup or sync iPhone files to iTunes library.
With this smart iPhone to Mac Transfer, you can select some of your favorite pictures on Mac to iPhone without replacing all files on iPhone like iTunes sync.
iPhone to Mac Transfer lets you upload photos from Mac to iPhone fast and easily. And music, movies, books, etc. are also allowed to copy to iPhone library. Moreover, if you need to transfer videos from iPhone to Mac, or between iPhone/iPad/iPod devices, you can still have this Mac iPhone Transfer tool help you.
Resource from: http://www.transfer-iphone-recovery.com/