How to use it
- Choose the alarm time.
- Add a label if you like, such as "Call mom".
- Click Set alarm and keep the tab open.
- When it rings, click Turn off or Snooze 5 min.
How the alarm clock works
The page shows the current time and date in large digits. Choose a time and click Set alarm. If that time has already passed today, the alarm is set for tomorrow. The page then shows when the alarm will ring and how long until then, and the browser tab title shows an alarm icon with the time.
When the alarm goes off, it beeps repeatedly for up to three minutes, shows your label, and sends a desktop notification if you've allowed notifications. Click Turn off to stop it or Snooze 5 min to ring again five minutes later.
Making sure you hear it
- Click Test sound before setting the alarm and adjust your volume.
- Keep the tab open. You can switch to other tabs or windows; the alarm is scheduled on the browser's audio clock so it rings on time in the background.
- Allow notifications when asked, so you get a visual alert too.
- On phones and tablets, keep the screen on and the browser in the foreground; locked screens and power-saving modes can block sound from websites.
- Make sure your computer won't go to sleep before the alarm time.
For waking up in the morning, your phone's built-in alarm app is more reliable. This online alarm is ideal while you work at your computer.
Handy uses
| Situation | Example label |
|---|---|
| Meetings and calls | "Team call at 2:00 PM" |
| Medication | "Take evening pills" |
| Cooking | "Take the roast out" |
| Breaks | "Stand up and stretch" |
| Parking meter | "Move the car" |
Alarm clock vs. timer
An alarm clock rings at a clock time (for example, 3:15 PM). A timer rings after a length of time (for example, in 25 minutes). If you think in "how long from now", the timer is easier. For focused work blocks with breaks, use the Pomodoro timer.
Time and privacy
The clock uses your device's time and time zone. If your computer's clock is wrong, the alarm will be too; you can check the official time at time.gov. Your alarm and label stay in your browser and aren't sent anywhere.
Troubleshooting
- No sound? Click Test sound. If you hear nothing, check the system volume, the browser tab isn't muted, and your output device (speakers vs. headphones).
- No notification? Your browser may be blocking notifications for this site; allow them in the site settings next to the address bar.
- Alarm went off late? Your computer may have gone to sleep. Change the power settings or keep the laptop plugged in and open.
Frequently asked questions
Does the online alarm work in the background?
Yes, as long as the tab stays open and your computer stays awake. It rings even if you're in another tab.
Can I snooze the alarm?
Yes. Click Snooze 5 min when it rings.
Can I set an alarm for tomorrow?
Yes. If the time you pick has already passed today, the alarm is set for the same time tomorrow.
Will the alarm work if my laptop is closed?
No. If your computer sleeps, the browser can't play sound.
Can I choose the alarm sound?
The alarm uses a built-in beeping tone generated in your browser; there are no sound files to download.
Sources
Last updated: November 12, 2026