⏰ Date & Time

Online Alarm Clock — Free 2026

Set a browser-based alarm with live digital clock, snooze, and dismiss controls.

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Current Time

Alarm Time

Label (optional)

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Alarm Status

How It Works

Pick alarm time
Add a label
Set the alarm

Your Browser-Based Alarm Clock

This free online alarm clock runs entirely in your browser using the Web Audio API. There is nothing to download or install. Simply choose a time, click Set Alarm, and leave the tab open. When the alarm fires, you will hear a repeating beep and see a visual alert on screen. Use the Snooze button to delay by five minutes or Dismiss to silence it immediately.

How the Sound Works

The alarm tone is generated using the Web Audio API, which synthesises a short beep pattern in real time. Because no external audio file is loaded, the alarm works even when you are offline. Make sure your device volume is turned up and that browser audio is not muted. If you need a visual countdown instead, try our countdown timer.

Tips for Reliable Alarms

Keep the browser tab open — closing it will stop the alarm. Most modern browsers throttle background tabs, but the alarm checks every second so it remains accurate. For precise time-keeping tasks such as measuring elapsed seconds, our online stopwatch is a better choice. This tool is ideal for reminders, naps, cooking timers, and study sessions.

Privacy and Offline Support

No data leaves your browser. The alarm time and label are processed locally — nothing is sent to a server. Because the Web Audio API generates sound on the fly, the alarm even works without an internet connection once the page has loaded.

Frequently Asked Questions

Does the online alarm clock work if I close the tab?

No. The alarm runs in your browser tab, so the tab must remain open for the alarm to fire. You can minimize the window or switch tabs, but do not close the page.

What sound does the alarm make?

The alarm uses the Web Audio API to generate a pleasant beep tone directly in your browser. No sound files are downloaded, so it works offline too.

Can I set multiple alarms at once?

This tool supports one alarm at a time. Dismiss or let the current alarm finish before setting a new one.

How does the snooze button work?

Pressing Snooze silences the alarm and resets it to go off again in 5 minutes, just like a physical alarm clock.