EventTimerEventTimer.io

Free Online Alarm Clock

Set an alarm right in your browser. Pick a time, choose your alert sound, and relax. No app to download, no account to create, just a reliable alarm that works.

No signup  ·  No download  ·  Works on every device

Live Demo

59:57

This is the real timer engine

Millisecond precision·Works on all devices·Fullscreen display·Instant start

Set an Alarm Without Installing Anything

You do not always have a phone alarm handy, especially when you are working at a computer. Maybe your phone is charging in another room, or you are at a shared workstation and cannot install apps. An online alarm clock solves that. Open EventTimer in your browser, set the countdown to match how much time you have, and the alarm goes off with a sound and visual flash when time is up. It works on any device with a browser, whether that is a Chromebook, a library computer, a tablet, or your own laptop.

  • Works on any device with a browser
  • Sound and visual alerts when time is up
  • No installation or account needed
  • Runs on Chromebooks, iPads, and desktops
01:00:00
60-minute default

Alarm Clock for Naps, Breaks, and Reminders

Power naps are most effective at 20 to 26 minutes, according to sleep research. Set a 20-minute countdown and close your eyes, knowing the alarm will wake you at exactly the right time. The same approach works for timed breaks during study or work sessions, or as a reminder to check the oven, take medication, or join a meeting. You can keep the alarm tab open in the background and it will still play the sound when the countdown finishes.

  • Background alarm, sounds even in another tab
  • 20-minute preset perfect for power naps
  • Customizable alert sounds
  • Visual flash for quiet environments
01:00:00
60-minute default

Wake-Up Alarm on a Hotel or Guest Computer

Traveling without your usual alarm clock? At a hotel with only a desk computer or smart TV with a browser? Open EventTimer, calculate the hours and minutes until your desired wake-up time, and set the countdown. The fullscreen display doubles as a bedside clock, showing the remaining time in large digits. When the alarm goes off, the screen flashes and the alert sound plays. It is not a replacement for your phone alarm every day, but it is a reliable backup that works anywhere you have internet access.

  • Large fullscreen digits work as a bedside clock
  • Fullscreen mode fills any display
  • Loud alert sound to wake you
  • Works on hotel room smart TVs and computers
01:00:00
60-minute default

Get started

Three steps, no signup

1

Open the timer

Visit eventtimer.io. The timer loads instantly in your browser, on any device.

2

Set your duration

Type any duration or choose a preset. Switch between countdown, count-up, or clock mode.

3

Go fullscreen and start

Press F for fullscreen, Space to start. Share the link if your team needs to see it.

Common questions

Will the alarm sound if I switch to another browser tab?

Yes. The timer continues running in the background and the sound alert plays when the countdown reaches zero, even if you are on a different tab.

Can I use this as a wake-up alarm?

Yes. Set the countdown to the number of hours and minutes until you want to wake up. The alarm will play a sound and flash the screen when time is up. Make sure your device volume is turned up and the screen does not go to sleep.

Is there a snooze feature?

There is no built-in snooze, but you can quickly set a new 5-minute or 10-minute timer to act as a snooze. Bookmark a short timer preset for one-tap access.

Do I need to keep the browser open?

Yes. The alarm relies on the browser being open (the tab can be in the background). If you close the browser entirely, the alarm will not fire.

Can I change the alarm sound?

The alert sound plays when the timer ends. You can adjust your device volume to control how loud it is. The visual flash provides a secondary alert in quiet environments.

Does it work on my phone?

Yes. Open EventTimer in your mobile browser, set the timer, and keep the browser running. On some phones you may need to disable battery optimization for the browser to ensure the alarm fires reliably.

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