Online Alarm Clock
Set one alarm or several, pick a sound, and let the tab wake you or remind you — free, no install.
This online alarm clock rings at the time you set, straight from your browser. Pick a time, choose an alert sound, and add as many alarms as you like — a 2 pm meeting nudge, a 3:30 school-run reminder and a 6 pm "stop working" bell can all be armed at once.
It is handy when your phone is charging in another room, when you are at a desk all day, or when you want a reminder on the machine you are actually looking at. The current time shows in a large clock face, and each alarm can be toggled on and off without deleting it.
Be aware of the one honest limitation: alarms only fire while this tab is open in a running browser. Close the tab or shut the laptop and the alarm cannot ring. For wake-up alarms that must not fail, treat this as a backup to a phone or bedside alarm, not a replacement.
How to set an alarm
- Set the alarm time using the hour and minute controls.
- Choose an alarm sound and preview it to check the volume.
- Click Set Alarm — it appears in your list of active alarms.
- Add more alarms the same way; toggle any of them off when not needed.
- Leave the tab open. When the time arrives, the alarm rings until you dismiss it.
Getting a browser alarm to ring reliably
Three things make the difference. First, interact with the page after loading (setting the alarm counts) so the browser permits audio. Second, unmute the tab and raise system volume — a muted tab rings silently. Third, keep the computer awake: adjust sleep settings if your machine dozes off before the alarm time, because a sleeping computer cannot ring.
Typical uses skew toward daytime: pomodoro-style break reminders, medication times, online-auction endings, ticket-sale openings, nap alarms and "leave for the bus" warnings. For counting down a duration rather than ringing at a clock time, the timer tool is the better fit.
How the browser alarm clock works
The tool reads the current time from your device's own clock and time zone, then watches for each armed alarm's moment to arrive. When it does, it plays your chosen sound and keeps ringing until you dismiss it. Everything runs inside the tab; nothing about your alarms is uploaded or stored on a server.
Because it uses the device clock rather than counting seconds, the alarm fires at the right wall-clock time even after the tab has sat in the background. The unavoidable trade-off is that the tab must stay open in a running, awake browser — a closed tab or a sleeping computer simply cannot ring.
Setting and managing several alarms
You can arm as many alarms as you need, and each appears in a list you manage independently. A workday might hold a 9:00 stand-up nudge, a 13:00 lunch reminder, a 15:30 school-run alert and a 17:30 "stop working" bell all at once.
Each alarm has its own on/off toggle, so you can silence a recurring reminder for a day without deleting and rebuilding it tomorrow, or remove ones you no longer need. Toggling keeps the time and sound you already set.
Where a desk alarm clock earns its place
It shines when your phone is charging in another room or deliberately out of reach and you are working at a computer all day. A reminder on the screen you are already looking at is harder to miss than a buzz from a pocket two rooms away.
The common uses are daytime and deadline-driven: break reminders, medication times, the end of a parking or meeting slot, an online auction closing, a ticket sale opening, or a short nap. For any of these the browser alarm is a convenient, no-install nudge.
Choosing and previewing the sound
Pick an alert tone and preview it before you rely on it, so the volume and character suit the room — a soft chime for a quiet office, something more insistent for a noisy kitchen or a nap you must not oversleep.
Previewing also doubles as the interaction browsers require before they will play audio later, so tapping preview when you set the alarm makes it more likely to actually sound at the appointed time.
An honest comparison with your phone's alarm
For anything you truly cannot miss — a morning wake-up, a flight, a critical call — your phone's built-in alarm is more dependable. It rings from a locked screen, survives the browser closing, and is built to wake a sleeping device; a browser tab is not.
Treat this alarm clock as a convenient backup and a daytime reminder rather than a sole wake-up, especially on phones, where locked screens and background-tab limits make it least reliable. Pair it with a phone alarm whenever the cost of missing it is high.
Related tools
If you want to count down a duration — 20 minutes from now — rather than ring at a fixed clock time, the timer is the better fit, with quick presets and a sound alert at zero.
For counting the days and hours to a future calendar date, the countdown-to-date tool keeps a live tally that stays correct even after you close the page, and the Pomodoro timer handles repeating work-and-break cycles.
Frequently asked questions
Does the alarm work if the tab is closed?
No. The alarm runs inside this browser tab, so closing the tab disarms it. Keeping the tab open in the background is enough — it does not need to be the active tab.
Can I set multiple alarms?
Yes. Add as many as you need; they all show in a list where each one can be switched on or off independently or removed entirely.
Will it ring if my laptop goes to sleep?
Usually not — a sleeping computer suspends the browser. Plug in and set your power settings to keep the machine awake past the alarm time if it matters.
Is this alarm clock free?
Yes, entirely free with no account and no limit on alarms. It is a small web page, not a service you subscribe to.
Can I use it as my morning wake-up alarm?
You can, if the computer stays awake and audible all night. Because one OS update or auto-sleep can silence it, we recommend pairing it with a phone alarm for anything you truly cannot sleep through.
Why is my alarm silent when it triggers?
Check the tab is not muted, system volume is up, and that you clicked somewhere on the page after loading — browsers block audio from pages you have never interacted with.
Does it work on phones?
It works in mobile browsers while the screen is on, but phones aggressively pause background tabs and locked screens, so for mobile alarms your phone's built-in clock app is more dependable.