Online Alarm Clock — free alarm clock with sound

What you get on this page

Everything here works in a browser tab, side by side. Pick the tool that matches what you actually need: Alarm — rings at a clock time you choose, like 6:30 or 14:00. Timer — counts down a duration you set, for tea, laundry or a focus block.

Stopwatch — counts up, with laps for splitting a run or a workout. World clock — current time in other cities, for calls across borders. Time zone map — the same thing visually, when you want to see the offset. Date tools — days between two dates, and what date falls a given number of days out.

How to set alarm clock time in three steps

Setting an alarm here takes about ten seconds. The steps are the same on a phone and on a desktop: Enter the hour and minute you want to be woken — the alarm uses clock time, not a countdown. Press Start. The page shows the time remaining until it rings, so you can confirm you set it for the right half of the day.

Leave the tab open. When the moment arrives, the sound plays and you stop it with one click. If you meant "in 20 minutes" rather than "at 7:15", use the timer instead. A timer takes a duration and an alarm takes a time of day; that is the only difference between them.

Alarm, timer or stopwatch — which one

Choose by the question you are asking. "When should this go off?" is an alarm. "How long from now?" is a timer. "How long did that take?" is a stopwatch. People often reach for a timer when what they want is an alarm clock online at a fixed hour, and then wonder why the countdown drifts from their schedule.

The only alarm that works is the one you can't reach from bed. This one is on your screen, so at least you have to look at it.

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.