Use the free Online Alarm Clock below: your data never leaves your browser — all work happens on your device, and nothing is uploaded to any server.
Sometimes you need an alarm and you do not have one at hand. Your phone is in another room, its battery is dead, or you are working on a computer and do not want to break focus to set a phone alarm. The Online Alarm Clock sets an alarm in your browser in seconds: pick a time, add a label if you like, press Set alarm, and the clock counts down in large digits until the time arrives and the alarm sounds.
The tool is deliberately simple. A large live clock shows the current time in hours, minutes and seconds, so you can check at a glance how long is left. The alarm time uses your device’s local time, which means it matches the clock on your computer and needs no timezone settings. A test sound button lets you check your volume before you rely on the alarm, which is worth doing: an alarm you cannot hear is just a silent countdown.
Here is the honest limit, stated plainly because it matters: this alarm only sounds while this page stays open in your browser. Browser alarms do not run in the background. If you close the tab, close the browser, or turn off the device, the alarm will not sound. Keep the tab open, keep the device awake, and keep the volume up. For anything critical, like catching a flight or taking medicine on time, set a second alarm on your phone as well. This tool is best for timers and reminders while you work at your computer.
Good alarm habits make the tool more useful. Set the alarm a few minutes before you actually need to act, so you have time to finish what you are doing. Use the label to say what the alarm is for, like ‘call back’ or ‘oven check’, because an alarm that only says it is time is easy to dismiss and forget. When the alarm sounds, press Stop alarm rather than just closing the tab, so you know it is properly off and not still ringing in a background tab.
The alarm sound is a simple beep tone generated in your browser, with no audio file to download and nothing to install. It repeats until you press Stop alarm, so it will not give up after one quiet beep while you are in another room. That said, browser audio depends on your device’s volume and sound settings: if your computer is muted, the alarm is muted too. The test sound button exists for exactly this reason, so test before you trust it.
Nothing about this tool needs an account, and nothing is saved or sent anywhere. Your alarm time lives only in the open page, and closing the page clears it. That is the trade-off of a browser alarm: instant and private, but only while the page is open. For a work session, a study break, a reminder to take a break from the screen, or a nudge to leave on time, that trade-off is exactly right.
How to set an online alarm
- Pick the alarm time in your device’s local time.
- Add a label saying what the alarm is for, if you like.
- Press Test sound to check your volume.
- Press Set alarm and keep this page open.
- Press Stop alarm when it sounds.
Frequently asked questions
Will the alarm sound if I close the tab? No. Browser alarms do not run in the background. Keep the page open, and set a phone alarm for anything critical.
Does it use my timezone? Yes, it uses your device’s local time, so it matches your computer’s clock.
Can I test the sound first? Yes. Press Test sound before you rely on the alarm.
Is anything saved or sent? No. The alarm lives only in the open page, with no account and no server.
Set it, test it, keep the tab open. For work sessions and reminders at your computer, that is all an alarm needs to be.