Preview open Mac windows from the Dock.

One Dock icon, several windows to choose from

Hover over a running app's Dock icon to see a row of live or static thumbnails. Click one to bring that window forward. Depending on the window, you can also close it, quit the app, or drag a file over its preview to bring the destination window into view.

It helps when an app has several windows open and their names don't tell you enough. These are previews of separate windows, not individual browser tabs.

Why some previews update and others stay still

With Live Previews turned on, a thumbnail updates while macOS can capture that window. Hidden or minimized windows may show a recent snapshot instead. If no image is available, you may see a text status or no preview for that window.

Set it up

1. Open the OD menu bar item and choose Settings.
2. Open Window Preview and enable Show Dock Window Previews.
3. Turn on Live Previews if you'd like thumbnails to keep updating where supported.
4. Grant the permissions listed in Settings. Then try hovering over the Dock icon of an app with a few windows open.

Permissions and limits

• Screen Recording is used to create the window thumbnails.
• Accessibility lets OmniDock bring windows forward, hide apps, or close windows when you ask it to.
• Some windows can't be previewed. System panels, protected content, full-screen mode, Spaces, displays, and the app itself can affect what macOS lets OmniDock capture.

OmniDock processes preview images locally. It does not upload window contents.

Prefer the keyboard?

You can add static previews above the app selected in Command-Tab, or turn on Option-Tab to switch between individual windows. These options use the main Show Dock Window Previews setting. Command-Tab itself still works as usual.