How to delete all the pictures on my iphone, yet still keep them on my laptop?

I want to delete all the pictures because my iphone can't handle more, but how do i still keep them on my laptop?

Plug your iPod into the laptop
click the documents icon and go down to the OS (C. And computer and and look for your iPod
click through all the folders
Drag all the photos into a file in your computer

Plug your phone into your computer, a box should pop up with a import photos option, click that and they will save on your computer, then you can delete them on your phone

Open you Camera Roll, tap the arrow button (top right), tap all the photos you want to delete, tap the Delete button at the bottom. (There isn't a "delete all" button.) Photos synced to your phone from your computer have to be deleted using the sync process (by deselecting them on the Photos tab in iTunes and syncing).

I want to delete pictures from my iPhone 5s but do not want to delete them from my iPad Air? How can I do this?