Online Alarm Clock
Set an alarm for any time and this page will ring — a simple alarm clock that lives in your browser tab.
Current time
No alarm set.
About this tool
An online alarm clock does one job: ring at the time you choose. Pick the hour and minute, press Set alarm, and leave this tab open — when the time arrives, an alarm tone repeats until you press Stop. If you set a time earlier than the current time, the alarm is automatically set for tomorrow.
Two honest limits of any browser alarm: the tab must stay open (a closed tab cannot make sound), and your device must not be muted. Within those limits it is perfect for desk naps, cooking, study sessions, and reminders while you work — no phone needed, no app to install.
How to use it
- Check the current time shown at the top.
- Pick the time the alarm should ring and press Set alarm.
- Leave the tab open. The alarm rings at the set time — press Stop to silence it.
Frequently asked questions
What if I set an alarm for a time that already passed today?
It is set for the same time tomorrow instead — the status line shows the exact date and time it will ring.
Will the alarm ring if my computer sleeps?
If the device is fully asleep the browser cannot play sound. When it wakes, the alarm rings at the next check if the time has passed — but background tabs can be checked as rarely as once a minute, so it may be up to a minute late. For an overnight alarm, a phone alarm is the safer tool.
Can I set more than one alarm?
Open this page in additional tabs — each tab holds one independent alarm.