What split screen does and when to use it

A split screen lets you see two windows side by side on the same monitor, so you can work in both at once without switching back and forth. You might use it to copy text from a web page into a document, follow a tutorial while working in another program, or compare two spreadsheets. Split screen is built into both Windows and Mac — you do not need to read anything.

Split screen is different from just resizing windows by hand. When you use the built-in split screen feature, the operating system snaps each window to exactly half the screen and keeps them aligned. This is faster than dragging and measuring, and it prevents the windows from overlapping.

Key Takeaways

  • Windows 11 and Windows 10 both have a built-in snap feature that you access by dragging a window to the left or right edge of your screen.
  • On Mac, you enter full-screen mode for one app, then swipe from the left edge to add a second app side by side.
  • Split screen works best on larger monitors — on a small laptop screen, the windows may be too narrow to use comfortably.
  • You can snap more than two windows on Windows 11 if your monitor is wide enough, using the corners and edges of the screen.

Split screen on Windows 10 and Windows 11

The easiest way to split your screen on Windows is to drag a window to the edge. Click and hold the title bar of the window you want to snap, then drag it all the way to the left edge of your screen until you see a transparent outline showing half the screen. Release the mouse, and the window snaps to the left half. Open a second window and drag it to the right edge the same way.

If dragging does not work or feels awkward, you can use keyboard shortcuts instead. Open the first window, then press Windows key + Left Arrow. The window snaps to the left half. Open the second window and press Windows key + Right Arrow. Both windows now fill their halves of the screen.

On Windows 11, you can snap up to four windows at once if your monitor is large enough. After snapping two windows side by side, you can snap a third window to the top-left corner and a fourth to the bottom-left, or arrange them in other combinations. Drag a window to a corner instead of an edge, and Windows shows you a grid of where it can go.

Split screen on Mac

Mac uses a different approach called Split View. First, open the app you want to use on the left side of your screen. Move your mouse to the green full-screen button in the top-left corner of the window (next to the red close button and yellow minimize button). Hold your mouse there for a moment until a menu appears, then click "Enter Full Screen".

Once the first app is in full-screen mode, swipe from the left edge of your trackpad with two fingers, or click and drag from the left edge of the screen with your mouse. This brings up a list of open apps. Click the app you want to use on the right side, and it snaps into place. You now have two apps side by side, each taking up half the screen.

To exit Split View, move your mouse to the top of the screen until the menu bar appears, then click the green full-screen button again and choose "Exit Full Screen".

When split screen does not work well

Split screen is most useful on a monitor that is at least 24 inches wide. On a laptop screen or smaller monitor, each half may be too narrow to read comfortably or to see all the buttons and menus you need. If your screen is small, you might be better off using Alt+Tab on Windows or Command+Tab on Mac to switch between windows quickly instead.

Some full-screen apps, like video players or games, do not work well in split-screen mode. If an app refuses to snap or looks wrong when snapped, close split screen and use the app in full-screen mode by itself.

Adjusting the split after you snap

Once two windows are snapped, you can adjust how much space each one gets. Move your mouse to the line between the two windows until the cursor changes to a resize arrow, then click and drag left or right. This lets you give more space to the window you are focusing on and less to the other.

On Windows, you can also use keyboard shortcuts to move a snapped window to a different position. Press Windows key + Up Arrow to move it to the top half, Windows key + Down Arrow to move it to the bottom half, or Windows key + Left/Right Arrow again to move it to the opposite side.

Troubleshooting split screen problems

If dragging a window to the edge does not snap it, check your Windows settings. Open Settings, go to System, then Multitasking. Make sure the toggle for "Snap windows" is turned on. If it is already on, try restarting your computer — sometimes the snap feature stops working until you restart.

On Mac, if Split View is not working, make sure both apps are compatible with it. Older apps or apps designed for iPad may not support Split View. Also check that you are using the green full-screen button in the window's title bar, not just maximizing the window by double-clicking the title bar.

If one window is much smaller than the other after snapping, you may have accidentally resized the dividing line. Move your mouse to the center line between the windows and drag it back to the middle of the screen.

Using split screen with different tasks

Split screen works best when you are doing two related tasks at once. A common setup is a web browser on one side and a document or spreadsheet on the other, so you can read information and type it in without switching windows. Another useful setup is a tutorial or video on one side and the program you are learning on the other.

You can also use split screen to compare two documents side by side, or to monitor one window while working in another — for example, keeping an email inbox visible while you work on a reply in a separate window.

Frequently Asked Questions

Can I save a split screen setup so it opens the same way next time?

Windows does not automatically remember split screen arrangements. On Mac, if you close Split View by pressing the green full-screen button, the next time you open those apps they will not automatically return to Split View. You will need to set it up again each time.

What if I want three windows visible at once instead of two?

On Windows 11, you can snap up to four windows using the corner and edge positions. On older Windows or Mac, you are limited to two windows in split screen. For a third window, you can resize it manually and position it on top of one of the snapped windows, though it will overlap.

Does split screen slow down my computer?

Split screen itself does not use extra resources. Your computer uses the same amount of power whether windows are side by side or overlapping. If your computer feels slow with split screen on, the slowness is coming from the apps themselves, not from the split screen feature.

Can I use split screen on an external monitor?

Yes. Split screen works on any monitor connected to your computer, including external monitors. If you have multiple monitors, you can use split screen on each one separately.