How to make a seamless loop
A loop is an animation that returns to its start without you noticing. Nearly every GIF, background animation and game character is a loop. It looks easy to build, but the moment it hitches the viewer sees it — and the cause is almost always one of the same three things.
The last frame must not copy the first
This is the most common mistake by far. The loop returns to frame one anyway, so the first frame already follows the last. Put a copy of frame one at the end and the same image is shown twice, producing a visible pause every lap. The last frame should be one step before the first.
The motion itself has to close
A swaying branch goes right, comes back left and returns to where it started. A walking character closes by completing a pair of steps. But a movement that only travels one way never closes; to loop it you either bring the motion back or build the scene on a repeatable pattern. For scrolling backgrounds, the answer is to size the pattern so it covers exactly one lap.
A short loop beats a long one
A good four-frame loop holds attention longer than a bad forty-frame one. Short loops keep files small and run past too quickly for the repetition to register. In long loops the eye memorises a detail and starts waiting for it every lap — which is exactly what the feeling of repetition is. Cut detail, shorten the loop.
Frequently asked questions
How many frames should a loop have?
Two to four frames for a simple shimmer, six to twelve for breathing or swaying, eight for a walk. Choosing the count from the natural period of the movement always beats picking an arbitrary number.
Why does my loop hitch?
Nearly always for one of three reasons: the last frame duplicates the first, the motion doesn't close, or one frame has a different hold length than the others. Checking those three in order usually solves it.
Can sound be looped too?
Yes, but the audio period has to line up exactly with the visual one. Otherwise sound and picture drift apart a little more each lap. Trimming the audio loop to the picture duration is the practical fix.
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