How to Put a Big Clock on Your Second Monitor

Turn a spare monitor into a full-screen clock in under a minute, with no software to install.

A second monitor is the perfect place for a clock you can read at a glance. Here's the quickest way to set one up, on Windows or Mac.

The one-minute setup

1. Open onlineclock.app in a new browser window (not just a tab).
2. Drag that window onto your second monitor.
3. Press F or click Full screen. The clock fills that monitor only, and the buttons fade away.
4. Turn on Keep screen on if your monitor tends to sleep while you're on the other screen.

Pick a display that's easy on the eyes

If the clock sits next to your work all day, a dim theme is easier on the eyes. The amber and red LED themes are the least distracting in a dark room. In a bright office, Paper (black on white) matches most apps.

Want something other than a clock?

• A world clock keeps the time for your team's cities in view.
• A Pomodoro timer paces focused work.
• A flip clock looks good on a desk or shelf screen.

Troubleshooting

Full screen opens on the wrong monitor. Move the window to the screen you want first, then go full screen.

The clock disappears when I click my main screen. On some setups, a full-screen window on macOS gets its own Space. Instead, maximize the window (double-click the title bar) rather than using full screen.