Turn any screen into a big, easy-to-read digital clock. Pick 12 or 24-hour time, show or hide the seconds, and dim the numbers to a soft glow that will not light up a dark room. Go full screen to fill the display; the time keeps showing and the screen stays awake, so it works as a quiet clock on a desk or wall.
Why a full-screen digital clock?
An old tablet, laptop, or spare monitor makes a great silent clock once the time fills the screen. No ticking, no notifications, nothing to install, just big numbers you can read from across the room. Prop it on a stand or hang it on a wall and you have a calm clock for the office, kitchen, or studio.
Dim numbers and night-friendly colors
A bright white clock is harsh in a dark room, so the face starts as a soft grey on black and the brightness slider lets you take it down further still. Warm colors like amber or red are the kindest on your eyes at night and disturb sleep less than blue-white light. Pick a preset or set any custom color, and your choice is saved in your browser for next time.
Will it cause screen burn-in?
Static bright numbers left on for hours can mark some screens, so this clock keeps the digits dim and, in full screen, slowly drifts them around the display, gliding about and bouncing off the edges so no pixel stays lit in one spot. That drift is on by default; you can turn it off or change its start delay and speed in the settings. Showing the seconds helps too, since part of the display is always changing. For a long night’s use, low brightness and a dim color are the safest pairing.
Does the screen stay awake?
Yes. In full screen the page asks the browser to keep the display on with the Screen Wake Lock feature, so the clock will not dim or drop off to sleep while you are watching it. It needs a modern browser and a single tap to start; if your device will not allow it, set a longer display timeout in your system settings instead.
Why doesn’t it open full screen on its own?
Almost every modern browser only lets a page go full screen in response to something you do, like a tap or a click, and never on its own. It is a built-in privacy and security rule, not something this site can switch off, so a page can’t jump straight to full screen the moment it loads. The good news is that it only ever costs you one click: as long as you do not want to change any settings, you pick your color or clock and it fills the screen right away.
How do I exit full screen?
Press Esc or double-click anywhere. On a phone or tablet, double-tap or long-press the screen.
How can I send feedback?
Got an idea, spotted a bug, or wish this did something it doesn’t? I’d love to hear it. Just fill in the short feedback form — no sign-up, and it only takes a minute.
Can I support Pure Background?
Thank you for asking. Pure Background is free, has no ads, and does not use analytics cookies. There is currently no support option available.
If you would like to support the site in the future, you can let me know through the feedback form. If there is enough interest, I may add a simple optional support link later.
Privacy policy
Pure Background is free and needs no account, sign-up, or registration. It sets no cookies and runs no advertising or third-party tracking. The only thing it saves is your own settings: your custom color, and on the clock pages the format, color, size, brightness, and drift options. Those live in your browser’s localStorage so the tool can remember how you like it next time. They never leave your browser, they are never sent to us or shared with anyone, and you can wipe them any time by clearing your browser’s site data.