Online timer
Set any countdown, hear an alarm, and run it fullscreen.
05:00
Ready
Press Esc to exit
Presets
Custom time
Alarm
Other versions
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1 minute timer
One minute, one press, and an alarm you can hear. -
5 minute timer
Five minutes with an alarm, in the tab or fullscreen. -
10 minute timer
Ten minutes on screen, with the alarm you choose. -
15 minute timer
Fifteen minutes, an alarm, and nothing to set up. -
30 minute timer
Half an hour, counted down where you can see it. -
1 hour timer
Sixty minutes, counted down and announced.
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Color screen
Pick any color and fill the whole screen, with brightness and an optional clock.
Type a length, press start, and the countdown runs in the tab. You can set anything from one second to twenty-four hours, use a preset, or open one of the ready-made pages for the length you need. When the time is up the page plays an alarm that is generated by your browser, so there is no file to load and no delay before it sounds. The tab title shows the remaining time, so you can work in another tab and still see it. Nothing is sent anywhere: the timer runs on your device and keeps working without a connection.
How to use
- Pick a preset or type hours, minutes and seconds in the fields.
- Press Start. The countdown runs and the tab title shows the time left.
- Choose an alarm sound and set the volume, or press Test sound to hear it first.
- Press Go fullscreen to fill the screen, and Esc to come back.
- Press Reset to return to the set time, or Pause to hold it where it is.
What it handles
- Counts from the clock, not from ticks: a background tab that stops updating still shows the right time when you return.
- The alarm is built with Web Audio while the page runs, so it starts the moment the timer ends, with no file to download.
- Repeat keeps the alarm ringing until you stop it, for the times you walk away from the screen.
- The fields read whatever you type: 90 seconds stays 90 seconds, and pasted text like "12 min" is read as 12.
- The screen is kept awake while the timer runs, on browsers that allow it.
- The chosen length goes into the address, so a link opens the same timer on another device.
FAQ
Does the timer keep running if I switch tabs?
Yes. The countdown is worked out from the clock time it should end, not from how often the page updates, so a tab that a browser slows down or freezes catches up as soon as you come back. The tab title carries the remaining time, so you can see it without switching. If the browser suspends the tab completely the alarm may sound late, so keep the tab open when the ending matters.
Where does the alarm sound come from?
Your browser makes it. Web Audio builds the tones while the page is open, so nothing is downloaded and the sound starts with no delay. Three sounds are offered: a short beep, a falling chime and a bell. Because browsers only allow sound after you interact with a page, the first press of Start is what unlocks it: a timer that was never started cannot ring.
How long can the timer be?
Up to twenty-four hours. Hours, minutes and seconds are added together and are not carried over, so 90 in the seconds field means a minute and a half. Anything longer than a day is trimmed back to twenty-four hours instead of being refused. There is no lower limit other than one second; a length of zero simply does not start.
Does it work offline?
Once the page has loaded, yes. The countdown, the alarm and the fullscreen view all run from the script already in the page, so you can turn off Wi-Fi and the timer still works. Your last length and your sound settings are kept in this browser on this device only, and nothing about them is sent to a server.
Can I keep the screen from going dark?
The timer asks the browser for a wake lock while it counts down, which stops most phones and laptops from dimming the screen. Not every browser offers it, and a locked phone will still sleep. Going fullscreen asks for the same lock, so the safest way to watch a long countdown on a phone is fullscreen with the phone plugged in.
Updated