A browser alarm for daytime reminders
Choose a time, type a label such as "Join call" and pick a sound. Each alarm shows how long is left until it rings. Switch the display between a 12-hour clock (2:30 PM) and a 24-hour clock (14:30). You can add up to five alarms, each with its own label.
There is an important limit. A web page cannot wake a sleeping device, so the page has to stay open and the device has to stay awake for an alarm to sound. Use it for daytime jobs at a desk or on a charging tablet: a meeting start, a laundry swap, a pickup time.
Do not rely on it as your wake-up alarm. For waking up, use the alarm built into your phone, which works with the screen off and the browser closed. If you only need a gap of time and not a time of day, an online timer is more direct.
Think of it as a reminder clock for a working day. Typical alarms are a stand-up at 09:30, a pickup at 15:45, a chore like switching laundry, or the moment a booking window opens. Give each a label so the ringing alarm tells you what it is for, and use the countdown beside each alarm to see how long is left.
For the sound to play, the browser tab usually has to stay in the foreground or at least open, the device needs to be awake, and the volume has to be on. Mute switches and browser rules about autoplay can silence a page, so start the page yourself and run a test alarm one minute ahead before you rely on it.
If you just need a gap, such as 25 minutes from now, the online timer is simpler and shows the finish clock time. If the time is a date well in the future, use the countdown timer or the days until page. This alarm is for a time of day today.
Things that stop a browser alarm
A web page can only ring while the browser lets it run. These are the usual reasons an alarm stays silent.
| Cause | What happens | What to do |
|---|---|---|
| Page closed | The alarm is gone | Keep the tab open |
| Device asleep or screen locked | Many browsers pause the page | Keep the device awake and plugged in |
| Volume off or tab muted | The alarm rings silently | Check volume and tab sound before you rely on it |
| Wrong time set | Rings at the wrong hour | Check 12-hour AM and PM or switch to 24-hour |
For waking up, use your phone's own alarm clock.
Questions about this timer
Will it wake me up in the morning?
Do not count on it. The page must remain open and the device must be awake, so use your phone's own alarm for waking up.
Does the sound play if the screen locks?
That depends on the device and browser. Many phones pause web pages when the screen locks, so test it before you depend on it.
How many alarms can I set?
Up to five at a time. Give each a label so you know which one is ringing.
What is the difference between 12-hour and 24-hour display?
Only how the time is written. 12-hour uses AM and PM, 24-hour counts from 00:00 to 23:59.
Can I set an alarm for tomorrow?
The alarm rings at the next time of day you set. If that time has passed today, it aims at the same time tomorrow. Keep the page open until then.
Why did my alarm not ring?
The usual causes are a locked screen, a sleeping device, a muted tab or a closed page. Test with an alarm one minute ahead and keep the page open and the device awake.