Fullscreen clock with seconds
This is a plain digital clock that fills the whole screen. It shows hours, minutes, seconds and the date, uses your local time zone, and keeps the display awake while it is fullscreen. Use it on a spare monitor, a TV in the office or a projector in a hall.
How to show the clock fullscreen
- Open this page on the screen where you want the clock.
- Press F or click the expand icon in the top right corner.
- Click the sun icon to switch between the dark and light theme.
- Press Esc to leave fullscreen.
Questions
Will my screen turn off while the clock is fullscreen?
No, in Chrome, Edge, Safari 16.4+ and Firefox 126+ the page asks the browser to keep the screen awake while it is fullscreen. Your power settings still apply when you leave fullscreen.
Can I hide the seconds?
The page always shows seconds. In the Clock Tab extension you can turn them off and pick a different clock style.
Is the time accurate?
The clock reads your device's system time, which most computers sync with internet time servers automatically.
Clock Tab
Open it on a projector, a second monitor or a classroom TV. Press F for fullscreen and the screen stays awake. Want it on every new tab? Add the free extension.
Add to Chrome, it's free Also works in Edge, Brave and Opera. No sign-up.