Holding Option while dragging something on macOS flips the gesture from "move" to "duplicate." It works almost everywhere the system accepts a drag — Finder, Notes, design apps, browser tabs — and saves you the ⌘C / ⌘V round-trip more times a day than you'd think.

How to do it

Start your drag, then press and hold Option before releasing. The cursor picks up a small green plus (+) badge — that's your "copy, don't move" confirmation. Let go where you want the duplicate to land.

It works either order: you can hold Option before you start, or add it mid-drag. macOS updates the cursor badge the moment the modifier engages.

Why it's useful

The unexpected part is that Finder's default drag behavior depends on the destination:

• Same volume (dragging between two folders on the same disk) → the default is move
• Different volume (dragging to an external drive or a network share) → the default is copy

That inconsistency is where mistakes happen: you expect a copy, you get a move, and now your file is somewhere you didn't mean to put it. Holding Option makes the intent explicit — it always copies, regardless of destination.

Where it works beyond Finder

Option-drag is a system-wide convention that ships with practically every macOS app that supports drag-and-drop:

• Notes, Reminders, Mail — duplicate items between folders
• Pages, Keynote, Numbers — duplicate shapes, text boxes, slides
• Figma, Sketch, Adobe apps — duplicate layers, components, artboards
• Safari, Chrome, Arc — drag a tab while holding Option to duplicate it into a new window

Related Finder modifiers

Once you know Option-drag exists, two siblings are worth remembering:

• ⌘ Command + drag — forces a move across volumes (inverse of the default)
• ⌘ Option + drag — creates an alias (shortcut / symlink) instead of a copy

Further reading

Apple documents this under Drag and drop items on Mac in the macOS User Guide — the section on copying items by pressing Option while dragging.