Set Alarm Online

Set a free online alarm directly in your browser.
No download required.

Alarm set for 07:30
Works even with tab minimized
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Wake up! Your alarm is ringing!

Alarm for 07:30

Select Alarm Time
Set alarm in:
Alarm Sound
soft & clear
Sonarclassic ping
Birdsnature sounds
Chimesoft chime
How to use this online alarm
1
Choose the time you want the alarm to go off using the time picker above.
2
Click "Set Alarm" — or use a Quick Alarm to set it relative to now.
3
Make sure your browser volume is turned up. The alarm will ring at the selected time — even if the tab is minimized or in the background.
FAQ
Will the alarm work if I close the tab?▾
The alarm will still ring even if the tab is inactive or minimized — as long as you keep the tab open in your browser. Closing the tab entirely will stop the alarm.
Can I set multiple alarms?▾
Currently only one alarm is supported at a time. Setting a new alarm will replace the existing one.
Does it work on mobile?▾
Yes! AlarmO'Clock works on mobile browsers. Keep your screen on and the volume up for best results.
What sound does the alarm make?▾
The alarm plays a beeping sound generated directly in your browser using the Web Audio API — no files to download.

Free Online Alarm Clock — Works in Any Browser

AlarmO'Clock's online alarm clock lets you set an alarm for any time of day without downloading an app. Just pick a time, click Set Alarm, and leave the tab open. The alarm will ring even if the tab is in the background or your screen is off.

Use the quick alarm buttons to set an alarm for 5, 10, 30 or 60 minutes from now. Choose from multiple alarm sounds including a gentle chime or loud buzzer. Perfect for naps, reminders, medicine, and anything else that needs a time-based nudge.