Window snapping with keyboard shortcuts on Mac

The fastest method: SeventySnap

Install SeventySnap, grant the Accessibility permission once, then press ⌃⌥← or ⌃⌥→ to snap the active window to a screen half, ⌃⌥↑ to maximize it full screen, ⌃⌥↓ to center it at 60%, or U, I, J, K to send it to a corner. No mouse, no button to aim at: the shortcut acts instantly on whichever window you're using, from anywhere on your Mac.

Download the free SeventySnap trial (7 days, macOS 13+).

Why not just hover the green button

• No mouse required: the shortcut works from the keyboard, no need to let go of the keys to aim at a tiny button at the top of the window.
• 8 positions instead of 2 or 3: halves, full screen, centered and the 4 corners, with a simple key scheme to remember.
• Works everywhere, immediately: no per-app configuration, the shortcut acts on the active window regardless of which app is open.

Why the Accessibility permission is needed

To move and resize another application's window, macOS requires the Accessibility authorization: it's the same permission every window manager uses. SeventySnap never reads what you type and never monitors anything continuously, it only acts the moment you press a shortcut.

An adjustable gap between windows

In SeventySnap's settings, choose a gap of 0, 8 or 16 pixels between windows snapped side by side: handy for keeping a tidy desktop without windows touching completely.

Mistakes to avoid

• Resizing windows by dragging with the mouse, pixel by pixel: slower and less precise than a shortcut memorized once and for all.
• Installing a complex window manager for a simple need: more settings doesn't mean more speed day to day.
• Forgetting that positions are calculated per screen: on a second monitor, the window snaps on THAT screen, not the main display.

Get SeventySnap: 7-day trial, then a lifetime license.