Alarm clock
Set a free online alarm that rings in your browser at the time you choose. Add a label, use quick presets, snooze for 5 minutes. No app or sign-up needed.
Current time
UTC
Shown in UTC until the page loads, then in this device's time zone.
No alarm set.
This is a device tool: it uses this device's clock and time zone. Keep this tab open with sound on; the alarm only rings while the page is open and the device is awake.
Bedtimes for common alarm times
| Wake up at | Bed for 7 h 30 min of sleep | Bed for 9 h of sleep |
|---|---|---|
| 05:00 | 21:15 | 19:45 |
| 05:30 | 21:45 | 20:15 |
| 06:00 | 22:15 | 20:45 |
| 06:30 | 22:45 | 21:15 |
| 07:00 | 23:15 | 21:45 |
| 07:30 | 23:45 | 22:15 |
| 08:00 | 00:15 | 22:45 |
| 08:30 | 00:45 | 23:15 |
| 09:00 | 01:15 | 23:45 |
Times include about 15 minutes to fall asleep. 7.5 and 9 hours are five and six 90-minute sleep cycles.
How it is calculated
The alarm time is compared with this device's clock every second. If the time has already passed today, the alarm is set for tomorrow. When it rings the page plays a tone made in the browser (no audio file), flashes the tab title and offers Stop or Snooze. The alarm is remembered in this browser, so it survives a reload.
Frequently asked questions
Will the alarm ring if I close the tab?
No. An online alarm clock only works while the page is open. Keep the tab open, the volume on and the computer or phone from going to sleep.
Why do I have to click before the alarm can play sound?
Browsers block sound that starts without a user action. Setting the alarm or pressing Test sound unlocks audio for this page so the tone can play later.
Which time zone does the alarm use?
It uses the clock and time zone of your device, like a bedside alarm. To ring at a time in another city, convert the time first with the time zone converter.
How does snooze work?
Snooze stops the sound and sets the same alarm again 5 minutes later. Stop ends the alarm completely.