How to get a picture on my computer to be on my iphone 4?

How do I get a picture on my computer to be on my iphone 4?

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Plug your iPhone into your computer, open the iPhone folder go into pictures and all your photos are going to be there. Then minimize that on half the screen, open the photos in your library on your computer and minimize it to the other half if your screen. You can either drag on pic from you computer library to your iPhone; or you can right click on the photo you want, click copy, then place the cursor on the iPhone library and right click again, and click paste. You can also use iTunes to sync the pictures to your iPhone. If you don't like to use iTunes, you can use a 3rd party software like this iPhone file manager, it can help you upload photos, videos, songs to iPhone easily.

Email

You can email yourself the photo and download it to your phone.