Online Alarm Clock — free alarm clock with sound

How to use Online Alarm Clock

Open the website and set the hour and minutes you want to be woken or reminded. Pick a sound and test it once, so you know the volume is right before you rely on it. Press Set and leave the tab open — minimized or in the background is fine.

When the time arrives, the sound plays until you stop it. That is the whole procedure. While you wait, the display shows the current time in large digital digits, and you can switch to a flip-style face if you prefer watching the seconds turn over.

When a browser beats the app on your phone

An alarm clock app lives on your phone, and your phone lives within arm's reach — which is exactly why so many people silence it half-asleep and drift off again. A laptop across the room forces you to stand up. A browser alarm also rescues you when the phone is dead, lost, or charging somewhere else, and it works on a borrowed computer where you are not allowed to install anything.

It is also simply less fuss for short naps at a desk: you set the alarm clock for twenty minutes ahead, turn the volume up, and close your eyes without unlocking anything. A good alarm is one you can hear. A great alarm is one you can hear and cannot reach without getting out of bed.

One tab, a whole set of time tools

The alarm is the front door, not the whole house. From this page you can open a timer that counts a fixed number of minutes down to zero, a stopwatch that counts up to the second, and a calculator for questions like how many days lie between two dates.

There are also countdowns to dates the whole world waits for. If you have ever wondered how many days are left until Christmas, the countdown clock on this site answers it live, in days, hours and minutes — and does the same for New Year, Halloween and the first day of each season. A world clock covers other cities and universal time, so the tab stays useful long after the alarm has done its job.

Why a browser instead of an installed app

An alarm clock app on your phone is fine when you own the phone. It is less useful on a shared computer, a work laptop where you cannot install software, a library machine, or someone else's desk. A browser page opens on any of them in a second and leaves nothing behind. There is no sign-up, no permissions dialog and no profile — you open the page, set the time, and close the tab when you are done.

Keeping it reliable

A few habits make any online alarm clock more dependable, whichever site you use: Check the volume before you rely on it, especially if headphones are plugged in. Make sure the computer is not set to sleep before your alarm time — a sleeping machine runs nothing.

Confirm the page shows the right current time; the alarm follows your device's clock. For something genuinely important, set a second alarm somewhere else too.