How to Change Wallpaper Automatically on Mac

Your Mac can rotate through a folder of wallpapers on its own — every hour, every day, every login, even every five seconds if you enjoy chaos. It's all built into the Wallpaper pane, works with your own photos, and needs no third-party app. Here's the setup and the details that matter.

Point macOS at your images

1. Gather the images into one folder — ~/Pictures/Wallpapers is a sensible home. (An album in Photos works too.)
2. Open System Settings → Wallpaper.
3. Scroll down and choose Add Folder or Album…, then select your folder.
4. Click the folder's tile so rotation controls appear, and switch from showing a single image to cycling the folder.
5. Pick the interval — options run from every few seconds through hourly and daily, plus rotating each time you log in or wake the Mac.

There's also a random order toggle: on for a shuffle, off to play the folder alphabetically. This works on Ventura, Sonoma, and Sequoia — the pane's layout shifts slightly between versions, but folder-plus-interval is the recipe on all three.

What actually happens as it rotates

• New files are picked up automatically. Drop another image into the folder and it joins the rotation — no need to re-add anything. This makes a folder synced from a photo service a self-updating wallpaper feed.
• Each display rotates its own image on a multi-monitor Mac, so your screens won't match — most people like the variety; if you don't, give each display a single fixed image instead.
• Spaces keep their independence. Wallpaper is per-desktop on the Mac, so rotation set on one Space doesn't overwrite another Space's fixed wallpaper.
• Battery cost is negligible at sane intervals. A wallpaper swap is one image decode; hourly rotation is invisible in your energy graph. The every-5-seconds settings are the only silly ones.

Make the images fit

Rotation is only as good as the pictures. Two tips save squinting later:

• Match your display's shape. Wallpaper images get scaled to fill the screen, so portrait photos lose their heads and feet on a 16:10 display. Landscape images at or above your screen resolution (3024×1964 on a 14-inch MacBook Pro) look crisp; anything smaller gets stretched.
• Check the fill mode. With a folder selected, the Wallpaper pane offers scaling choices (fill, fit, stretch, centre, tile). Fill Screen is right for photos; Fit to Screen letterboxes odd shapes instead of cropping them.

Where the built-in shuffle falls short

Two things the Wallpaper pane won't do: rotate at a custom interval it doesn't list (there's no "every 3 hours"), and use different rotation folders per Space in a convenient way — you must configure each Space separately while standing on it. If you only wanted a fresh look each morning, though, Every day plus a folder of favourites does the job perfectly.

Curating a folder that stays good

The rotation is only as delightful as its worst image, so prune ruthlessly: stray screenshots, memes, and photos with important detail near the top edge (the menu bar sits over it) all read badly as wallpaper. A practical structure is one master Wallpapers folder plus a seasonal folder you swap in occasionally — the pane points at one folder at a time, so switching collections is just re-selecting.

Two quiet behaviors to exploit. Because new files join the rotation automatically, anything that writes into the folder becomes a wallpaper source — a synced album, a monthly export of your best photos, any automation that saves one image a week. And because wallpaper is per-Space, you can rotate on your main desktop while keeping a fixed, calm backdrop on the Space where you present or record your screen: set the rotating folder while standing on one, the still image while standing on the other.

Want moving wallpaper instead?

Rotation swaps stills; macOS can also shift one wallpaper through the day (Dynamic Desktop) or play slow aerial video. Different feature, same pane.