Blur everything except the window you are working in on a Mac

macOS has no setting that blurs the windows behind the one you are working in. The closest built-in options hide them instead: Hide Others (Option-Command-H) takes every other app off the screen, and Stage Manager moves them to a strip at the side. To keep the window you are using sharp and soften everything else, with the sharp spot following you as you switch, you need an app such as Shoji, whose Focus Blur does exactly that.

Which approach suits you depends on why you want it. In a cafe, on a plane or in a shared room, the point is that the person in the next seat cannot read your other windows. At home, it may just be fewer distractions. The built-in tools handle the second well and the first only partly.

Hide Others: the quickest built-in option

Every Mac app has Hide Others in its app menu, the menu named after the app, just right of the Apple menu. Choose it, or press Option-Command-H, and every other app’s windows leave the screen. The app you are in stays exactly as it is.

To bring an app back, click it in the Dock or switch to it with Command-Tab, and its windows return. Show All, in the same app menu, brings every hidden app back at once.

Two habits make this faster:

• Command-H hides the app you are in. It is the quickest way to put something private away when someone sits down beside you.
• Option-click another app’s icon in the Dock to switch to it and hide the app you were using in one go.

The catch is that hidden means hidden. You cannot glance at the chat window while you write, and every switch brings a whole app’s windows back in full view, readable by anyone who happens to be looking.

Stage Manager: one window in front, the rest set aside

Stage Manager puts the window you are using in the middle of the screen and moves other apps to a column of thumbnails along the left edge. Turn it on from Control Center, or in System Settings under Desktop & Dock.

For privacy, hide the recent apps. The Stage Manager control in Control Center has an option for it, and Desktop & Dock has the same setting. The thumbnails then stay out of sight until you move the pointer to the left edge of the screen.

Stage Manager is tidy, but it changes how you work. Windows resize and move, apps form groups, and if you already have a layout you like, it rearranges it. The thumbnails, when they do show, are previews of the real windows, so they hide less than they seem to.

Full screen for one thing at a time

Putting a window in full screen gives it a Space of its own, so nothing else is on that display. Click the green button at the top left of the window, or press Control-Command-F in apps that support it. On a single screen, this is the most complete way to show only one thing.

The trade is switching. Moving to another app means sliding the whole screen to another Space (Control-Left Arrow and Control-Right Arrow do it from the keyboard), which is fine for one app at a time and awkward when you work across two.

Gaps to cover whichever you choose

A few things are worth setting, or knowing, whichever approach you use:

• Notification previews. Banners appear over whatever you are doing. In System Settings, under Notifications, set Show previews to Never, or turn on a Focus from Control Center while you work in public. When Unlocked is not enough here: you are using the Mac, so it is unlocked, and the preview shows.
• The window you are working in. Anything that keeps your current window sharp also keeps it readable. If that work itself is private, the only answers are the angle of the screen, where you sit, or a physical privacy filter fitted over the display. A privacy filter for a MacBook: physical screen or software? weighs the two.
• Screen sharing and cameras. Blurring or hiding on your own screen is about people looking over your shoulder. It is not a way to control what a call app shares or what a camera can see.

Focus Blur: only your window stays sharp

Shoji has a mode for exactly this. With Focus Blur on, only the window you are using stays sharp, and everything behind it softens. Switch to another window and the sharp spot moves with you. Nothing is hidden or rearranged, so you can still see the shape of your layout and find your way around it; the person beside you just cannot read it.

It was made for cafes, planes and shared rooms. Blur strength is a setting, so if you can still make out words in the background from where a neighbor would sit, turn it up.

Two other modes deal with the same problem from different sides:

• Messaging apps kept private. Messages, Slack and Mail can stay blurred unless you are the one using them. Hold Option over one to peek without switching to it.
• A quick blur of everything. When someone walks up behind you, the whole screen softens with no password needed, and esc brings it back. A hot corner can trigger it too, so you do not need the keyboard. Hide Slack, Messages and Mail when someone walks up to your Mac covers that moment in more detail.

The blur is drawn by macOS itself. Shoji never captures the screen or reads what is in your windows, so it asks for no Screen Recording, Accessibility or Full Disk Access permission. That matters for something you leave running all day: the tool hiding your screen has no way to see it.

What it does not do: it does not change what the window you are working in shows, it is not a physical privacy filter, and it does not stop other apps from recording the screen or a camera from seeing it.

Picking the right approach

Match the tool to the situation rather than using one for everything:

1. Fewer distractions at home. Stage Manager or Hide Others is enough, and both are already on your Mac.
2. Writing in public with chat and email open. Focus Blur, with messaging apps kept blurred until you use them.
3. Someone walking up for a moment. The quick blur, and esc when they have gone.
4. Leaving the table. Lock. In Shoji that is Command-L, which slides a screen over every display; Touch ID or your Mac password opens it with every window where you left it.

Shoji is $14 once, free for 24 hours, and runs on macOS 14 or later, on Apple silicon and Intel.

Questions

Can macOS blur background windows on its own? No. Hide Others, Stage Manager and full screen take other windows out of view, but none of them blur. Blurring everything except the active window needs a separate app.

Does blurring the screen need Screen Recording permission? Not if the blur is drawn by macOS rather than by copying the screen. Shoji works this way, so it never asks for Screen Recording.

Can I still read the blurred windows myself? Not their detail, which is the point. You can see where windows are and switch to one, and in the messaging-app mode you can hold Option over one to peek.