Set an Alarm Online

Set an alarm online instantly.
Use it as a quick alarm for 5 minutes, 10 minutes, or any custom time.

Alarm set for 07:30
Works even with tab minimized
--:--:--

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. To set an alarm, simply select the time, click the set alarm button, and keep this page open. Your alarm will ring at the exact time you choose.

Use this free online alarm clock to set alarms quickly and easily, right from your browser. No download or sign-up required.

This tool is perfect for reminders, naps, study sessions, cooking, or staying on schedule throughout the day.