Digital Clock — Large Customisable Online Clock

A digital clock that adapts to where you are using it. Switch between 12 and 24 hour, show or hide the seconds, pick a colour that suits the room, and set the size for your screen. Everything is remembered in your browser, so the clock comes back the way you left it every time.

Choosing a format

The 12-hour form reads faster for most people at a glance in countries where it is standard; the 24-hour form removes any chance of confusing morning with evening. Neither is better in the abstract — the comparison is in 12 hour vs 24 hour display.

Seconds: useful or distracting?

Seconds help when you are timing or syncing something and distract when the clock is simply background. For a bedside or lobby display, turning them off makes the screen calmer and, on OLED panels, reduces the constantly-changing region. Both cases are covered in digital vs analogue readability.

Guides about Digital Clock

How & why 12 Hour vs 24 Hour Display: Which Should Your Clock Show? How the 12-hour and 24-hour formats actually read on screen, where each one goes wrong, and which to choose for a kitchen, a classroom or a control room. 5 min read How & why Clock Accessibility: Contrast, Colour and Readable Digits What actually makes a clock readable for everyone: contrast ratios, colour choices that survive colour blindness, size against viewing distance, and less movement. 6 min read How & why Digital Clock Fonts and the Seven Segment Display Seven bars, ten digits, and a few ambiguities. How segment displays draw numbers, what fonts imitate them, and why numeral width decides whether a clock sits still. 6 min read How & why Digital vs Analog Clock: Which Is Easier to Read? Digits give you the exact time faster; a dial shows you how much time is left. A practical comparison of the two readouts and what each is genuinely better at. 5 min read

More digitalclock.now pages

Fullscreen Clock Fill the screen — for a desk monitor, a classroom projector, a lobby display or a stream. 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

Can I change between 12 and 24 hour?

Yes, with the format control under the clock. Your choice is saved in this browser and applies next time you visit.

Are my settings saved?

Yes — format, seconds, colour and size are stored locally in your browser on this device. Nothing is uploaded.

How do I make it bigger?

Use the size slider, or go fullscreen for the largest possible display on your screen.

Does the clock need an internet connection to stay accurate?

It reads your device's clock, which your operating system keeps synchronised. Once the page is loaded it stays accurate on its own.