GIPHY For Mac

GIPHY is a free (I love free) Mac utility that captures whatever portion of your screen you want and turns it into an animated GIF.  To demonstrate, I downloaded a free (repeat the love) video from Pixabay of crashing waves and ran the video while GIPHY recorded a selected portion of it.  Then using some of the available options to reduce the size of the resulting GIF, I saved it and uploaded the result to include it below.

https://giphy.com/apps/giphycapture