Choosing frame timing for a photo GIF
The frame delay decides the feel of the animation. Slideshows read best at 1–2 seconds per image so viewers can take each one in. Stop-motion and flip-book animations need 80–200 ms per frame to look like movement. Blinks and before/after reveals often work with two frames at 500–800 ms each.
Every frame uses the same delay here; if you need different timings for different frames later, you can change the speed of the finished GIF or trim frames you no longer want.
Mixing image sizes and formats
The GIF takes its shape from your first image. Other images are either letterboxed (Fit) so nothing is cut off, or cropped (Fill) so they cover the whole frame. If the first image isn’t the shape you want, move a better-shaped image to the front, or crop the finished GIF.
Formats can be mixed freely — a PNG logo, a JPG photo and an iPhone HEIC shot can all go in one GIF. Format-specific pages such as JPG to GIF, BMP to GIF and HEIC to GIF explain the quirks of each format, and the GIF Maker adds video as a source too.