Three kinds of movement
Search for an animated wallpaper and the results mix all three together, which is why the advice you find contradicts itself. They behave differently and they cost different amounts to run.
- Stills that shift with the clock
- One image file holding several versions of the same scene across the day. macOS fades between them as the hours pass. Nothing actually moves — catch it at any single moment and it is a photograph.
- Aerial films, the built-in video
- Real 4K video, built in and shared with the screen saver. On the desktop the system plays one around login and unlock, then holds a frame; only the screen saver runs it continuously. Skywall keeps it moving. Some films never appear in the picker.
- Video played by an app you install
- A third-party player paints your own clip, or a downloaded one, onto the desktop. It is the flexible option, and the cost depends on the app: a good one decodes in hardware and stops when the desktop is covered.
Switching one on
- 1
Open System Settings, then Wallpaper
It sits next to Screen Saver, because the two have shared one library since macOS 14. Scroll past the stills and the flat colours.
- 2
Pick a film from the Aerial rows
The first click starts a background download of a 4K master, so the desktop may sit on a still frame for a minute while it lands.
- 3
Know what the desktop does with it
The system plays the film around login and unlock, then holds a frame. It runs continuously only as the screen saver, set in the pane next door.
- 4
Reach the ones the pane never lists
Some films never appear in the picker. They are in the manifest macOS already reads, and any of them will play.
- 5
Keep it moving
Skywall lists every film and plays your choice on the desktop all day, on every display.
Animated, live, dynamic
In everyday use all three mean the same thing: a desktop that moves. The distinction worth keeping is the one above — a dynamic desktop is a photograph swapped on a schedule, an Aerial film is video.
Your own clips and GIFs
That is a genuinely different job, and worth saying plainly: the Wallpaper pane takes pictures, so a video file of yours cannot go in it. Software exists that paints a window over the desktop and plays whatever you hand it. Skywall plays only the films the system already ships.
What it costs the machine
The frames go through the same hardware block macOS uses for its own screen saver, so the CPU barely participates. The part that decides your battery life is not the decoding, it is the stopping: Skywall halts the moment a full-screen app covers the desktop, when the display sleeps, when the Mac locks, when it runs hot and in Low Power Mode.
Browse all the films to see what the pane leaves out.
Questions
How do I get a dynamic wallpaper on a Mac?
System Settings → Wallpaper, then choose one of the Aerial films rather than a still. On macOS 14 and later it can sit on the desktop, not only in the screen saver; the system plays it around login and unlock, and Skywall keeps it playing.
Are animated, live and dynamic wallpapers the same thing?
In everyday use, yes. The one real distinction is between a dynamic desktop, a still swapped on a schedule, and an Aerial film, which is video.
Can I use my own video as a dynamic wallpaper?
Not through System Settings, which accepts pictures only. Your own clip needs a third-party player; Skywall plays only the built-in films.
Do dynamic wallpapers drain the battery?
Far less than people expect: decoding is hardware. Skywall stops under a full-screen app, on lock, on sleep, on heat and in Low Power Mode.
Which dynamic wallpapers does macOS include?
The Aerial films — landscapes, cities, the ocean floor and the Earth from orbit. Skywall lists every one of them and plays any on every display.
Do they work on an external monitor?
Yes, and on several at once: the same film plays on every display. The footage is a 4K master, so it holds on a 27-inch panel.
Next: where the rest of the films are, andthe pixel size every Mac screen wants.