I can't know that the files aren't transferred somewhere without thoroughly inspecting the source and it isn't obvious from the page that this is an offline app.
Thanks for the example. It would be great if the page itself linked to some demonstrations.
Ah, yeah, so now it's totally safe because it says so right there on the page.
The points raised in higher-up comments are still relevant... It's impossible to know for sure exactly what will happen with my images that I Drag n Drop.
Of course, for a 24 hour effort, it's great. But this is the 80/20 rule at play. The first 80% was the "easy" bit. Now you have to create some demoes, tutorials, earn user trust, etc.
I don't have a lot of need for animated GIFs personally, but this seems like a neat little tool.
Thanks for the example. It would be great if the page itself linked to some demonstrations.