Online Alarm Clock

Set an Online Alarm Clock in Seconds

Need a free online alarm clock that works right in your browser? Pick a quick preset — 5, 10, 15, 30, 45, or 60 minutes — or type an exact wake-up time and hit Add. The alarm rings as long as this tab stays open, with no download, signup, or app install. Works on desktop, laptop, tablet, and phone.

How to Set an Alarm for X Minutes from Now

This is the most common use case: "set alarm for 10 minutes," "set alarm for 20 minutes," "set alarm for 1 hour." Use the Quick Timer row at the top of the tool:

1. Click the minute preset you want (5m, 10m, 15m, 30m, 45m, or 1h).
2. A new alarm appears in Your Alarms with the exact ring time calculated from now.
3. Keep the tab open. When the time hits, a full-screen alert appears and a gentle beep plays until you click Stop Alarm.

Need a duration that isn't a preset — say 7 minutes, 25 minutes, or 90 minutes? Use the custom input below instead and type the target clock time (e.g. 3:45 PM).

How to Set an Alarm for a Specific Time

For wake-up times like 6:30 AM or a meeting reminder at 2:15 PM:

1. In the Set Alarm box, click the time input and pick the hour and minute.
2. Optionally add a label (e.g. Stand-up, Take medication, Laundry) so you know which alarm is ringing when multiple are active.
3. Click the + button to add it to your alarm list.

You can stack as many alarms as you need — the tool checks every active alarm once per second and rings the first one whose time matches the current minute.

Managing Multiple Alarms

Each alarm in Your Alarms has three controls:

• Bell icon — toggle the alarm on or off without deleting it. Useful for recurring reminders you want to reuse tomorrow.
• Time and label — shows the ring time in 24-hour format and whatever label you set (defaults to Alarm 1, Alarm 2, etc.).
• Trash icon — permanently remove the alarm.

If you're running a focused work session with structured breaks, a Pomodoro Timer handles the 25/5 work-rest cycle automatically instead of you setting each interval by hand.

Does the Alarm Ring if the Tab is Closed?

No — and this is important. The alarm runs entirely in your browser, so closing this tab stops the countdown. You can:

• Minimize the window — alarm still rings.
• Switch to another tab — alarm still rings.
• Lock the screen (on most desktops) — alarm still rings.
• Close the tab or quit the browser — alarm is lost.

For alarms that must fire even if your computer sleeps or the browser is closed, use your OS clock app or phone alarm. For anything shorter than a few hours where you're actively at your machine, this online alarm clock is the fastest way to set one.

Why the Alarm Might Not Play

If the timer elapses but you hear nothing:

1. Check your device volume. Browser audio uses the system volume — if your laptop is muted or your headphones are unplugged, no sound comes through.
2. Check browser audio permissions. Some browsers (especially Chrome and Safari) block audio from tabs you haven't interacted with. Click anywhere on the page once before the alarm is due — that satisfies the autoplay policy.
3. Close competing audio. If another tab is actively playing audio in some browsers, the alarm beep can be delayed. Pause that tab and the alert will still show on screen.

The alarm uses a short 800 Hz sine-wave beep pattern — audible but not jarring — generated on the fly via the Web Audio API, so there's no audio file to load.

Common Uses for an Online Alarm Clock

• Power naps — set 20 or 30 minutes and keep the tab open on your second monitor.
• Cooking — multiple simultaneous timers for different dishes, each with a label.
• Study sessions — quick 25-minute blocks (or use the Pomodoro Timer for automated work-rest cycles).
• Meeting reminders — set an alarm five minutes before a call when your calendar app isn't in front of you.
• Medication and stretch breaks — labeled daily-time alarms you can toggle on when you're at your desk.

Is This Alarm Clock Private?

Yes. No account, no tracking pixel on the alarm logic, and no server round-trip when you set an alarm. Everything — the alarm times, labels, and sound playback — lives in your browser tab. When you close the tab, your alarm data is cleared.