I just made my first gif on Giphy (it's on my tumblr, though I had to put it in through Photobucket, since posting it to tumblr from the site made it too small and too fast). Here's the link to the site:http://www.giphy.com
I tried another site called GifSoup, but you had to create an account, and it's a lot harder than it looks. With Giphy, you don't need to create an account and it's really easy. Perhaps I will submit that imagine I thought up to a tumbr multi fandom imagine blog, since now I can make my own gifs for it. I made another one, but I like this one better, since I'm a sucker for scenery (especially in a tropical setting like Isla Nublar, and you really can't tell what the characters are running from, since they don't really show that. I made it from the official Jurassic World
trailer that you can find on YouTube).