How to transfer videos from my computer to my iphone?

I saved videos from youtube to my computer, I want to send them to my phone so I can upload parts of them onto vine.(i have the app to upload it with)
how do i send videos to my iphone
i have a samsung pc
windows 7

Added (1). I want to transfer a video from my samsung computer to my IPHONE 4S.

Connect Your IPHONE 4S with us computer from USB connect & Copy from computer & paste it in your IPHONE 4S internal memory card.

This way you can transfer videos from computer to iPhone 4S:

1.Open iTunes. Open the Edit menu on Windows or the iTunes menu on a Mac. Click the "Preferences" option. Make sure the "Disable automatic syncing for all iPhones" check box is selected.

2.Plug your iPhone 4S into the computer and wait for iTunes to recognize it. Click on your iPhone's icon on the right side of the iTunes window. Click the "Video" tab.

3.Select the video you want to sync to your iPhone using playlists. You can also select the option to sync all your video to the iPhone.

4.Click "Sync" when you're done customizing your settings.

Frist check their file format, like mp4, 3gp etc. Whether they are compatible with your Iphone or not, if yes then use your USB data cable to transfer data!

Well connect your Samsung phone with usb cable and after that you will Samsung in my computers tab and enter into Samsung where you will find phone and memory card and paste the videos there…

Its just like copying and pasting a file into a usb pen drive

If your downloaded video is already mp4 video, you can import the mp4 video into iTunes at first. Connect your iPhone to computer through USB cable, iTunes will recognize the iPhone automatically, and then go to iTunes menu 'File -> Sync iPhone', the video will be transferred to iPhone. If your video is not iPhone compatible mp4 video, you can follow this step by step guide to convert and sync the video to your iPhone, it's easy to understand and works pretty well for me.

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