What this makes, and how to make it well
A GIF from stills is a flipbook: it shows moments in sequence, looping forever, autoplaying everywhere without sound or a play button. That makes it the right format for before-and-after comparisons, small product turnarounds, reaction sequences, sprite previews and step-by-step UI walkthroughs. It is the wrong format for anything that needs smooth motion or photographic colour, and the page above will not pretend otherwise.
Two settings shape the result. Time per frame is the rhythm: fast for flipbook energy, slow for a slideshow. Width is the size lever, and GIFs get heavy quickly; 480 pixels is plenty for chats and comment sections, and going wider should be a deliberate choice.
The palette, and why order matters
GIF allows 256 colours per palette, and cheap tools compute a palette per frame, which makes colours pop and shimmer as the loop plays. This tool computes one palette across all frames, so a red that appears in frame one is the same red in frame nine. The cost is honesty about photographs: skies and gradients will band a little, because 256 colours is all there is.
Frames play in exactly the order shown, and the arrows let you fix what the file picker got wrong. All frames adopt the first image's shape, so lead with the image whose framing you want the GIF to have.
If you want it to actually move
A flipbook switches between moments; nothing moves inside a frame. When what you really want is the photo coming to life, that is a different tool: an image-to-video model generates the in-between motion from a single still. The link below the tool goes there. For the flipbook itself, you are in the right place, and nothing you drop here leaves your browser.