How to Change App Icons in the Mac Dock

The Dock shows whatever icon the app itself carries — so to change a Dock icon, you change the app's icon. macOS has supported this for decades through a simple copy-paste in Finder's Get Info window, no extra software required. Here's the full method, its limits, and the one-key undo.

Step 1: copy the new icon

You need replacement artwork on the clipboard. Two ways to get it there:

1. From an image or .icns file: double-click the image to open it in Preview, press Cmd+A to select all, then Cmd+C to copy. Square PNGs with transparency (512px or larger) look best.
2. From another app: select the donor app in Finder, press Cmd+I for Get Info, click the small icon in the top-left corner of the window (a faint highlight ring appears), and press Cmd+C.

Step 2: paste it onto the app

1. In Finder, open the Applications folder (Cmd+Shift+A) and select the app you're customizing.
2. Press Cmd+I to open Get Info.
3. Click the small icon at the top-left of the Get Info window — not the big preview lower down. It gets a highlight ring when selected.
4. Press Cmd+V. Enter your administrator password if macOS asks (normal for apps in /Applications).

The new icon appears in Finder immediately. The Dock can lag behind: if the old icon lingers, quit and relaunch the app, or run killall Dock in Terminal to refresh it (that restarts the Dock harmlessly — layout and settings survive).

Undo: bring the original icon back

1. Select the app and press Cmd+I again.
2. Click the small top-left icon to highlight it.
3. Press Delete (Backspace).

The custom artwork is discarded and the app's built-in icon returns instantly. Nothing inside the app was ever modified — the custom icon is stored as metadata on the file, which is also why this trick is perfectly safe.

The two limits worth knowing

• App updates undo your work. When an app updates, the new version arrives with its own icon and your customization is gone. Keep your .icns files in a folder so re-applying takes ten seconds.
• System apps won't accept a paste. Apple's built-in apps (Safari, Mail, Messages…) live in /System/Applications, which System Integrity Protection makes read-only — the paste simply fails, by design. That protection is worth leaving alone; if you're curious why, see our SIP explainer.

Where to find good icons: designers publish free .icns sets on sites like macosicons.com, or make your own from any square PNG. Consistent icon packs are the fastest way to make a Dock look deliberate instead of default.

Folders can wear custom icons too

The same Get Info paste works on any folder — project folders, drives, even the Applications folder itself. The specifics (and a color-tinting trick) are in how to change folder icons on Mac.