Fullscreen Digital Clock — Big Screen Clock

A fullscreen digital clock sized for a room rather than a desk. Set the format and colour first, then go fullscreen — the page requests a screen wake lock where the browser supports it, so the display will not sleep partway through a lesson or a shift.

Sizing for the room

A rough guide for legibility is about 25 mm of digit height for every 8 metres of viewing distance. Practically, set the size so the clock reads clearly from the back of the space, then step back and check. Room-specific advice is in classroom clock displays and fullscreen clock on your desktop.

Leaving it running for hours

A static bright display on an OLED panel risks burn-in, so choose a dimmer colour, hide the seconds, or use a screen that does not mind. Sleep settings and the wake lock trade-off are covered in keeping your display awake.

Guides about Fullscreen Clock

Setup guides Classroom Clock Displays: Sizing, Contrast and Countdowns How to put a clock on a classroom display that the back row can actually read, with sizing, contrast, the seconds question and pairing the time with a countdown. 6 min read Setup guides Clock Overlay for Streaming: Adding the Time to Your Scene How to put the time on a stream: a browser source in OBS Studio, a transparent background, sensible placement, and digits that survive video compression. 5 min read Setup guides How to Put a Fullscreen Digital Clock on Your Desktop Turn a spare monitor, old laptop or tablet into a large, readable time display with a fullscreen digital clock, and keep it lit and legible all day. 6 min read Setup guides How to Keep Display Awake While a Clock Is Showing Every platform's route to stopping the screen sleeping, what the browser's wake lock can and cannot do, and when leaving a panel lit is a bad idea. 6 min read Setup guides Using a Clock Screensaver on an Idle Screen A browser clock makes a better idle display than drifting photographs. How to set one up, avoid burn-in, dim it for the room and stop the machine sleeping. 5 min read

More digitalclock.now pages

Digital Clock A large digital clock you can set to your liking — format, seconds, colour and size, all remembered. Clock with Alarm A clock and a simple alarm in one tab — set a time and it sounds. Night Mode Clock A dim red clock for a dark room — readable at a glance without waking you up.

Frequently asked questions

How do I exit fullscreen?

Press Escape, or press the fullscreen button again. Your settings are kept either way.

Will the screen stay awake?

In fullscreen the page requests a wake lock where supported, which prevents the display sleeping. It is released when you leave fullscreen.

Is it safe to leave on an OLED screen?

Use a dimmer colour and hide the seconds to reduce burn-in risk, or run it on an LCD panel for long unattended periods.