How to put three windows side by side on Mac
Two windows side by side is easy on a Mac. Three is where it gets frustrating. You want your editor, a browser, and a chat window all visible at once — three equal columns — and no matter which built-in feature you reach for, macOS quietly refuses to split the screen into thirds. Here's why getting three windows side by side on Mac is harder than it should be, the native workarounds that exist, and the fastest way to do it from the keyboard.
Why macOS can't split your screen into equal thirds
macOS has two separate window features, and neither does thirds.
Split View — the full-screen mode you get by holding the green traffic-light button — only ever holds two windows. It takes over the whole display in its own Space, splits it down the middle, and that's it. There's no way to add a third window to a Split View.
Window Tiling — the windowed snapping added in Sequoia and refined in macOS Tahoe (26) — is more flexible but still capped. Hover the green button, or use the Window → Move & Resize menu, and you get halves, quarters, corners, Fill, and Center. The keyboard shortcuts are built around the 🌐 (Globe/Fn) key:
- Halves: 🌐 Control + arrow (left, right, top, bottom)
- Fill the screen (as a window): 🌐 Control + F
- Center: 🌐 Control + C
- Restore: 🌐 Control + R
- Two-window splits: 🌐 Control + Shift + arrow
Look closely at that list and you'll notice the ceiling: every layout is a fraction with a power-of-two denominator — a half, a quarter. There is no equal-thirds arrangement and no keyboard shortcut for one. Apple's own tiling reference confirms it: the presets stop at quarters.
The native "three window" workaround (and where it stops)
macOS does have one three-window arrangement, but it isn't thirds. In the green-button menu — or with the five-key chord 🌐 Control Option Shift + arrow — you can pick Left & Quarters (or Right & Quarters): one window fills half the screen, and two more stack as quarters on the other side. That's three windows on screen, but it's one big, two small, not three even columns.
If you genuinely need three equal columns natively, the only route is manual: tile the first window to a half, drag the second in beside it, then drag the divider and hand-resize each window until they look even. It works once. It does not survive you closing an app and wanting the layout back, and every step needs the mouse.
Getting true equal thirds: your options
To split a Mac screen into three equal parts, you need a window manager that understands thirds. Here's how the common options compare.
| Method | Equal thirds? | Keyboard-only? | Cost |
|---|---|---|---|
| Split View (green button) | No — 2 windows max | No | Free (built in) |
| Window Tiling (🌐 Control + arrows) | No — halves/quarters | Yes, for halves | Free (built in) |
| Rectangle | Yes — left/center/right third | Yes | Free (open source) |
| Magnet | Yes — thirds & two-thirds | Yes | $4.99 (App Store) |
| Let's Tile | Yes — visible grid | Yes | Free thirds; Pro one-time |
Rectangle is the free, open-source default here: it ships dedicated left third, center third, and right third commands (bound to Control-Option-D/F/G out of the box, remappable to whatever you like). Magnet, the $4.99 App Store snapper, covers thirds and two-thirds too. Both are solid if you already know the chord you want.
The trade-off with shortcut-per-layout tools is memory: you have to learn and remember a distinct key combination for "left third," "center third," "right third," "left two-thirds," and so on. That's fine once it's muscle memory, and slow while you're getting there.
Three equal columns, without memorizing a thing
Let's Tile takes a different approach: instead of a shortcut per layout, you summon a visible grid and place each window into it. Its default grid is three columns wide, so three-up is the layout it's built for — and thirds are free, with no time limit.
Here's the whole flow for three windows side by side:
- Focus your first window and press ⌘ Return — a 3-column grid appears over the screen with a highlighted "ghost" in the top-left cell.
- Press ⇧ ↓ to grow the ghost down to the full-height left column, then Return — the window snaps to the left third.
- Focus the second window, press ⌘ Return again, tap → to move the ghost to the center column, ⇧ ↓ to fill it, Return.
- Third window: ⌘ Return, → → to the right column, ⇧ ↓, Return.
Because the grid is on screen the whole time, there's nothing to memorize — you're aiming at cells you can see, and your hands never leave the keyboard. The free tier gives you thirds forever, which is exactly this job. If it sticks, Let's Tile Pro is a one-time purchase (no account, no subscription, one key for up to 20 devices) that unlocks the full grid: reshape it on the fly with ⌥ + arrows for quarters, fifths, or any split you want, send a sized window to another display with ⌘⇧ + arrows, set a preferred grid per monitor, and add margins between tiles. It's not open source, and it's newer than Rectangle or Magnet — worth knowing if those matter to you.
When thirds are actually worth it
On a 13- or 14-inch laptop, three columns get cramped fast — halves are usually the right call, and native tiling handles those. Thirds start to earn their place on a 27-inch display or an ultrawide, where a full third is still a comfortably wide window. A common setup: reference or chat in a narrow left third, your main work in a wider center two-thirds, and swap the layout as the task changes.
For the two-window case and the native features in more depth, see our guide to splitting the screen on a Mac and the full tiling overview.
Frequently asked questions
Can you split a Mac screen into three with Split View? No. Split View is a two-window, full-screen mode. To get three windows side by side you need windowed tiling plus a third-party tool for equal thirds, or the manual drag-and-resize workaround.
Is there a keyboard shortcut for thirds on Mac? Not natively — the built-in tiling shortcuts only cover halves and quarters. Rectangle, Magnet, and Let's Tile all add thirds you can trigger from the keyboard.
How do I get three equal windows, not one big and two small? macOS's native "Left & Quarters" arrangement gives you three unequal windows (one half, two quarters). For three equal columns, use a window manager with a thirds or grid layout.
What's the fastest way to arrange three windows? Whichever you don't have to think about. A visible-grid tiler like Let's Tile lets you place each window by pointing at a cell you can see; a shortcut-based tiler like Rectangle is faster still once the chords are muscle memory. Both beat dragging and hand-resizing.
Want the whole picture on keyboard window management? Browse the Let's Suite blog.