Online Alarm Clock
Set an alarm for any time, right in your browser.
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Your local time (Asia/Calcutta)
What does Online Alarm Clock do?
Set an alarm for a clock time or a number of minutes from now, and the page rings when it arrives. Several alarms can run at once, each with its own label, and a desktop notification appears alongside the sound so you do not miss it when the tab is hidden.
How to Use Online Alarm Clock
- 1Pick a timeA clock time, or minutes from now.
- 2Label itOptional, and useful when several alarms are set.
- 3Leave the tab openThe alarm rings from this page, so it must stay open.
Key Features
- Alarm at a clock time, or a set number of minutes from now
- Several alarms at once, each with its own label
- Live clock showing your local time and time zone
- Sound alert plus an optional desktop notification
- Quick presets for the common five, ten and thirty minute alarms
- Snooze and dismiss when an alarm rings
Frequently Asked Questions
Does the alarm work if I switch tabs?
Yes, as long as the tab stays open. It is scheduled against the real clock, so background throttling does not delay it, and a desktop notification appears alongside the sound if you have granted permission.
Will it ring if I close the browser?
No. A web page cannot run once its tab is closed. Keep the tab open, or use your phone alarm for anything you genuinely cannot miss.
Why did I not hear the sound?
Browsers block audio until you have interacted with the page, so the first alarm you set enables the sound. A muted tab or a system volume at zero will also silence it — the visual alert still appears.
Which time zone does it use?
Your device local time, which is shown on the clock so there is no ambiguity. To set an alarm against another city, convert the time first with the time zone converter.
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