A live wallpaper is a short video loop drawn where your desktop picture normally sits — behind every icon, window, and menu. Nothing about how you use the Mac changes: you click through it, windows cover it, Mission Control and Stage Manager treat it like any wallpaper. The only difference is that the image moves.
The terms people mix up
- Live wallpaper — a video loop playing continuously at the wallpaper layer. Motion is the point.
- Dynamic wallpaper — a still image that swaps variants based on time of day or appearance mode. macOS ships several. No motion, just scheduled stills.
- Animated wallpaper — usually a synonym for live wallpaper, sometimes used for procedural or shader-drawn scenes rendered in real time instead of decoded from video.
- Interactive wallpaper — reacts to the cursor, audio, or system state. Rare on macOS and much more expensive to run, because the frames cannot be pre-encoded.
- Screen saver — takes over the whole screen when you are away. It is a different macOS surface from the wallpaper, even when it shows the same footage.
Why video, not real-time rendering
A pre-encoded video is by far the cheapest way to put motion on a desktop. Every Mac has dedicated media decoding hardware, so a 4K loop can play without the CPU touching a single pixel. A procedurally rendered scene has to be computed frame by frame, every frame, forever — which is why shader-style wallpapers tend to warm up a laptop and video-based ones do not. That difference is explained in hardware video decode.
What makes a loop feel good
- Seamless — the last frame flows into the first. You are going to see this transition hundreds of times a day.
- Slow — drifting clouds, rain, slow pans. Fast motion in peripheral vision reads as a notification and pulls your eye.
- Low contrast where your icons live — busy bright areas behind desktop icons make labels hard to read.
- Resolution-matched — sized to your display, not above it. See resolution and displays.
On macOS specifically
macOS has no built-in way to set your own video as a desktop wallpaper, which is why apps like MacWall exist. Desktop playback works on macOS 14 and later; live Lock Screen and Screen Saver motion needs macOS 26 (Tahoe) or later, because that is when Apple exposed the APIs third-party apps use. More on that in how macOS wallpapers work.
Keep learning
- How macOS wallpapers workmacOS composites the wallpaper as its own layer below icons and windows, and only recent versions let third-party apps supply Lock Screen video.
- Hardware video decodeApple's media engine decodes H.264 and HEVC in dedicated silicon, so a 4K wallpaper loop costs almost no CPU.
- Video formats and codecsEncode wallpapers as H.264 or HEVC in an MP4 container, at display resolution, 24–30 fps, with no audio track.
- Resolution and displaysMatch wallpaper resolution to the panel's native pixels, and prefer one mirrored loop over separate loops on every display.
- Battery and energy basicsA wallpaper's battery cost is decode work times time on screen — pausing when nothing is visible removes almost all of it.