How do I save iBooks pdf on iPhone to computer so I can delete them from iPhone? My iPhone 6s+ is running out of memory. I have so many crochet patterns on my iBooks. How do I transfer those patterns to computer so i can delete them from my iPhone? When I first bought the computer I synced my phone then started deleting them from my phone, then they started deleting from the computer.

What did I do wrong?
To delete them only from your phone, follow these steps:

In the upper-right corner of the iBooks window, tap Select.
Scroll to find the item that you want to delete, then tap it.
In the upper-left corner of the iBooks window, tap Delete.
Tap Delete This Copy.

If you tap Delete from All Devices, it will remove it from iCloud, which will cause it to be deleted from all devices (including your computer).