Online Alarm Clock

Set alarms in your browser — no app, no install

🔔

ALARM!

00:00:00

Set Alarm

ALARMS

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Frequently Asked Questions

Is the Online Alarm Clock free?
Yes — completely free, no sign-up needed.
Does the Online Alarm Clock work offline?
Yes — once loaded, it works without an internet connection.
Can I use the Online Alarm Clock on mobile?
Yes — works on any device.
Does the Online Alarm Clock make a sound?
Yes — audio alerts are supported in modern browsers. Make sure your volume is on.

Embed This Tool

Add this Online Alarm Clock to your website or blog for free — just paste this code:

<iframe src="https://alarm-clock.tabutility.com/" width="100%" height="600" frameborder="0" style="border-radius:12px" title="Online Alarm Clock by Tabutility"></iframe> <p style="font-size:12px"><a href="https://alarm-clock.tabutility.com/" target="_blank" rel="noopener">Online Alarm Clock</a> by <a href="https://tabutility.com/" target="_blank" rel="noopener">Tabutility</a></p>
Free to use — the credit link helps others find the tool
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This free online alarm clock lets you set one or many alarms right in your browser — no app download, no account, and no permissions beyond keeping the tab open. It is perfect for quick naps, reminders while you work at a computer, cooking timers, or waking up when your phone is charging in another room.

How the Online Alarm Clock Works

You pick a target time and the tool compares it to your device's real-time clock every second. When the current time matches your alarm, it plays an alert sound and shows an on-screen notification until you dismiss it. Everything runs locally in the browser tab, so your alarm times are never sent to a server.

Because the alarm depends on the tab staying active, it is best used on a device that stays awake — a desktop, laptop, or a phone with the screen kept on. For reliability, keep the browser tab open and your device's sound turned up.

Example 1: Set an alarm for 2:30 PM to end a 20-minute power nap and get an audible alert the moment your device clock hits 14:30.
Example 2: Working in focus blocks? Set alarms at 10:00, 11:30, and 1:00 to remind yourself to stand up, stretch, and drink water.

Frequently Asked Questions

Does the online alarm work if I close the tab?

No. The alarm runs inside the browser tab, so the tab must stay open and the device awake for it to sound. Keep the page visible or minimized rather than closing it.

Do I need to install anything to use this alarm clock?

No. It works instantly in any modern web browser with no app, sign-up, or download. Just set a time and leave the tab open.

Why isn't my alarm making a sound?

Most browsers block audio until you interact with the page, so click somewhere on the tab first. Also check that your device volume is up and the tab is not muted.

Can I set more than one alarm at a time?

Yes. You can add multiple alarms for different times, which is handy for staggered reminders throughout the day.