Fullscreen Clock

Where a big clock earns its place

A spare monitor on a shelf, a tablet propped in a kitchen, a screen at the back of a studio or a classroom: places where you want to read the time from several meters away without picking anything up. Full screen and a dark theme make it legible across a room; the seconds can go if they distract.

Whose time is this?

It is your device's clock, shown as your system reports it — this page has no clock of its own and asks no server for the time. If it is wrong, it is wrong in your operating system's settings, and fixing it there fixes it here.

The date, when you turn it on, is formatted in US English, matching the rest of the site rather than following your locale.

The screen-awake toggle, and why it starts off

A clock is exactly the page someone leaves open for hours, which is why this one does not keep your screen awake unless you press the button. Holding a screen on is a real cost — battery on a laptop or tablet, and wear on an OLED panel, which does not enjoy a static bright image for hours.

When you do turn it on, the lock is released as soon as you hide the tab or leave the page, and it comes back when you return. Not every browser offers it, and where yours does not the control is disabled and says so rather than pretending to work.

If you are leaving a bright clock on an OLED screen for a long time, move it occasionally or use a dark theme — both reduce the risk of a faint permanent mark.

Nothing is remembered

The format choices are not stored, so the page opens the same way every time. That is the rule everywhere on this site, and a clock is not worth making an exception for.

For a timer rather than the time, use the Countdown Timer or the Stopwatch; for an empty screen with nothing on it at all, Focus Mode.