How to use this online timer
Tap 1, 3, 5, 10, 15 or 30 minutes or 1 hour and the countdown starts immediately. For any other time, tap the big digits, type it and press Enter or Start. When time is up, your chosen alarm sound plays until you press Stop alarm.
- Typing a time: a plain number means seconds (90 → 1 min 30 s); colons mean m:ss or h:mm:ss (1:30 → 1 min 30 s, 1:30:00 → 1 hour 30 min). Units work too: 25m, 1h30m, 90s, 1.5h. A live preview such as "= 1 min 30 s" shows how your input was read. Anything from 1 second to 99:59:59 works.
- Adjusting: +1 min while running pushes the end time back (the + and − keys add or remove a minute). Pressing +1 min after the alarm works like a snooze.
- Names: label a timer ("Pasta", "Laundry") and the name appears in the tab title and notification when it ends.
- Recently used: custom times and named timers appear as dashed buttons next to the presets so you can restart them in one tap.
- Share link: the link icon copies an address like ?t=5m. Opening it starts that timer straight away, which makes it perfect for bookmarks.
Run multiple timers at once
Press Add timer to create up to 12 timers, each with its own name and duration, all running at the same time. Cooking pasta, sauce and something in the oven? Give each a timer and they will ring in order, each announcing its name.
On a computer the timer you touched last is outlined in blue and keyboard shortcuts apply to it. If an alarm rings for a timer that is scrolled out of view, a Stop alarm bar appears at the bottom of the screen.
Repeat timers, alarm sounds and full screen
- Repeat timer: switch on the repeat icon and the timer beeps briefly and restarts every time it ends, ideal for "stretch every 10 minutes" or interval reminders. Each round is measured from the exact moment the previous one ended, so it never drifts.
- Alarm sounds: choose from digital alarm, chime, ringing bell, marimba, singing bowl and gentle rise, and play it once, three times or until stopped. Sounds are synthesized in your browser, so nothing is downloaded.
- Full screen: press the full-screen button (F) to fill the display with giant digits for presentations, meetings, exams or workouts.
- Keep awake: while a timer runs, the page asks the browser to keep the screen on (Screen Wake Lock, supported in current Chrome, Edge, Safari and Firefox).
- Desktop notifications: turn them on in settings to get a notification when a timer ends while you are in another window.
Why it stays accurate in a background tab
Many web timers subtract one second per tick, so they fall behind whenever the browser slows down a hidden tab. Browsers do this on purpose: Chrome runs timers in hidden tabs at most about once per second, and since Chrome 88 it batches chained timers in tabs that have been hidden and silent for over five minutes to once per minute.
This timer stores the end time and recalculates the remaining time from the real clock every time it draws, so it is correct the moment you come back. The alarm is scheduled ahead on the browser’s audio clock when you press Start, and a separate wake-up is armed for the exact end time, so it rings on time even in a background tab. The tab title shows the countdown too.
Running timers survive a reload. Browsers only allow sound after you interact with a page, so after a reload or opening a shared link you may need to tap the "enable the alarm sound" button once.
Using it on a phone
Mobile browsers may pause or heavily delay web pages when the screen turns off or you switch apps; iPhones in particular are designed not to keep web pages running in the background. The remaining time is corrected as soon as you return, but to be sure you hear the alarm, keep the screen on with the page open. The keep-awake option helps with that.
Some phones mute web page sound in silent mode. For an important alarm, use the preview in settings to check that you can hear it.
Quick links
Each link starts a timer immediately. Bookmark the ones you use most.
1 minute timer · 3 minute timer · 5 minute timer · 10 minute timer · 15 minute timer · 20 minute timer · 30 minute timer · 1 hour timer · 2 hour timer
FAQ
Is the timer accurate if I switch tabs or minimize the window?
Yes. It counts down to a fixed end time, so switching tabs never causes drift, and the alarm is scheduled in advance. If your laptop goes to sleep, no sound plays while it sleeps; the page shows that time is up when it wakes.
Why didn’t the alarm make a sound?
Check the speaker icon, the volume in settings, and your device volume or silent mode. Browsers block sound until you interact with the page, so after a reload or a shared link, tap the "enable the alarm sound" button once.
How long does the alarm ring?
Choose once, 3 times or until stopped in settings. "Until stopped" repeats until you press Stop alarm (or Space/Esc), but stops by itself after 10 minutes in case you are away. The "Time’s up" message stays until you dismiss it.
Can I run several timers at the same time?
Yes, up to 12, each with its own name and duration. Each one announces its name when it ends.
Will the alarm ring if my phone screen turns off?
It depends on the device and browser. Phones often pause web pages when the screen is off, so keep it on to be sure. The page asks the browser to keep the screen awake while a timer runs, and the remaining time is always corrected when you come back.
Are my timers saved?
Your timers, names, recent times and sound settings are saved only in this browser and never sent to a server. A running timer continues after a reload.