Just take a large sharp knife to cut the leafy top off and the bottom of Pineapple. Then cut the fruit down top into two half circles then into 1/4ths. I use a sharper thinner knife to cut off core pieces and cut the skin off. Put the fruit into a freezer Ziplock bag, or plastic container with lid and place into the freezer. I estimate the freshness is good for about 1-2 months. Mine never lasts that long though.
You can microwave to defrost what you need or just pull out of freezer, take what you need and let it thaw in a bowl or plate. Home made pizza with pepperoni and pineapple are me and my mans fave. It is also great on fresh salads to. It works just like fresh.
The picture pretty much tells you the most important thing. That you can freeze Pineapple. I got the idea from the grocery store. They were selling frozen Pineapple. Doing it yourself insures the peak freshness and flavor. You can look at my blog, "My knife is not sharp enough". To get a bit of info. on ideas where to get a knife sharpener and where I got my knife sharpener cheap.