How to use a vertical monitor with a Mac: rotate, arrange and actually use it
A portrait monitor is great for code, documents and chat. Getting macOS to agree takes one setting and a minute of arranging.
Turned on its side, a 24 or 27 inch monitor shows a whole file of code, a long document or a full chat history without scrolling. macOS supports it out of the box. Here's how to set it up so it feels natural.
1. Rotate the monitor and the picture
- Turn the monitor to portrait on its stand or arm. Check the stand allows it: many have a pivot, some don't.
- Open System Settings → Displays and select the monitor you turned.
- Set Rotation to 90°. If the picture is upside down, choose 270° instead.
- If macOS asks whether to keep the change, confirm it.
Don't see Rotation? It isn't offered for a MacBook's built-in screen, and some docks and adapters hide it. Connect the monitor directly and look again.
2. Arrange it where it really sits
In System Settings → Displays → Arrange, the monitor now shows as a tall rectangle. Drag it to the side it's on and line up its top and bottom with your other screens the way they line up on your desk. If it's taller than your main screen, center it or align the tops, whichever matches your eye line. Getting this right means the pointer moves across in a straight line instead of catching on a corner.
3. Fix text size
A rotated 4K monitor can make text tiny. Select it in Displays and pick a scaled size between Larger Text and More Space. Try to get text roughly the same size as on your main screen, so your eyes don't refocus every time you turn.
4. Decide what goes on it
- Code: twice as many lines on screen.
- Documents and PDFs: a whole page at a readable size.
- Email, Slack and other chat: long threads without scrolling.
- Browser: most sites are tall and narrow anyway.
Video, spreadsheets and timelines are better on a landscape screen.
5. Keep windows in place
macOS can tile windows into the top and bottom half of a tall screen: drag a window to the top or bottom edge, or use Window → Move & Resize (macOS 15 Sequoia and later). Window manager apps like Rectangle add shortcuts for top and bottom halves and thirds, which suit a portrait screen well. There's a rundown in Mac window management: the built-in tools and the best apps.
6. Type where you're looking
A vertical monitor usually sits to one side, so you turn your head to read it. Then the classic multi-monitor problem appears: you turn, start typing a reply, and the text goes into the window on the other screen because that's the one you last clicked.
Glance Switch fixes that. It's a menu bar app that uses your Mac's camera to notice which screen you're facing and moves keyboard focus there. A portrait monitor beside your main one is easy for it to tell apart, because you turn your head to look at it. Calibration takes about 20 seconds per screen, and nothing leaves your Mac.
For the rest of a multi-screen setup, see how to set up multiple monitors on a Mac.
Common questions
How do I rotate my screen to vertical on a Mac?
Turn the monitor on its stand, then open System Settings → Displays, select that display and set Rotation to 90° or 270°. If the picture comes out upside down, choose the other one.
Why is there no Rotation option for my display?
macOS only shows Rotation for displays that support it. It isn't offered for a MacBook's built-in screen, and some docks or adapters hide it. Connect the monitor directly with USB-C, DisplayPort or HDMI and check again.
Should a vertical monitor go on the left or the right?
Put it on the side of your main hand or the side you turn to least for typing. Many people keep code, docs or chat there and the main screen straight ahead. Then match that side in System Settings → Displays → Arrange.