Free online stopwatch and countdown timer with laps, an interval (HIIT/Tabata) timer, multiple timers at once and an alarm clock. Loud alarm, full screen, and exact time even in a background tab.
Five timing tools in one page: a stopwatch with lap splits, a countdown timer with an alarm, an interval timer for HIIT, Tabata and circuits, up to 12 timers running at once, and an alarm clock. Every clock is stored as a real end time rather than a counter, so it stays exact in a background tab, rings on time, and picks up where it left off after a reload. Type a time like a microwave (130 = 1 min 30 s) or tap a preset, then go full screen for a room-sized display or pop out a floating mini timer. Six alarm sounds are generated in your browser and ring until you stop them. No sign-up, no download, and your laps, timers and alarms stay on your device.
This page is five timing tools in one: a stopwatch with laps, a countdown timer, an interval timer for workouts, a multi-timer for cooking, and an alarm clock. It's built to behave like the clock app on your phone. It keeps exact time when you switch tabs, rings a loud alarm until you stop it, shows the time left in the tab title, and remembers everything if you reload the page. There's nothing to install and no account, and your laps, timers and alarms are saved only in your browser.
Features
Stopwatch with laps: fastest and slowest highlighted, average lap, consistency, copy or CSV export, and saved times
Countdown timer with microwave-style entry, 13 presets, recent times, +30 s / +1 min / +5 min, loop mode and 'ends at' time
Overtime count-up after zero (+00:12 in red) for talks, exams and presentations
Interval timer for HIIT, Tabata, EMOM, boxing rounds and circuits with sets, rest between sets, warm-up and cool-down
3-2-1 beeps and spoken cues (Go, Rest, round number) for workouts
Multi-timer: up to 12 named timers at once, each with its own ring and alarm
Alarm clock with once, daily, weekday and weekend alarms plus 5-minute snooze
Keeps exact time in background tabs (Web Worker clock) and resumes after a page reload
Six alarm sounds, adjustable volume, and ring for once, 15 s, 30 s, 1 min or 5 min
Full screen display, floating always-on-top mini timer (Chrome and Edge), time in the browser tab and a progress favicon
Desktop notifications, keep-screen-awake, shareable timer links and keyboard shortcuts
How to use Online Timer & Stopwatch
1
Pick a mode
Choose Stopwatch, Timer, Intervals, Multi-timer or Alarm clock from the tabs, or press 1 to 5.
2
Set the time
For a countdown, click the time and type digits (500 = 5 minutes, 130 = 1 min 30 s) or tap a preset like 10 min. For intervals, pick Tabata or HIIT, or set work, rest and rounds.
3
Start it
Press Start or the Space bar. In the stopwatch, press Lap (or L) to record splits without stopping the clock.
4
Switch tabs if you like
The timer keeps exact time in the background and shows the countdown in the browser tab title. Go full screen (F) or open the floating mini timer (P) to keep it in view.
5
Stop the alarm
At zero the alarm rings until you press Stop alarm or Esc, and a desktop notification appears if you allowed it. Add a minute with one click if you need more time.
Common use cases
Set a quick 5, 10 or 30 minute timer for cooking, naps, laundry or a break
Run HIIT, Tabata and circuit workouts with spoken cues and 3-2-1 beeps
Time laps and splits for running, swimming, speed cubing or a test run
Keep a full screen countdown on a classroom, exam or meeting screen, with overtime shown in red
Run several kitchen timers at once, each named and ringing on its own
Wake up or get reminded with a browser alarm clock while you work
Detailed guide
Which mode do you need?
Each mode fits a different kind of timing. Use a stopwatch when you want to know how long something takes, and a timer when you want to be told when time is up. The interval timer alternates work and rest for you, and the multi-timer runs several countdowns at once. The alarm clock rings at a set time of day rather than after a set length of time.
Mode
What it does
Great for
Stopwatch
Counts up from zero with lap splits
Running laps, speed tests, timing a task
Timer
Counts down and rings at zero, with loop and overtime
Cooking, naps, study blocks, talks, exams
Intervals
Alternates work and rest for set rounds and sets
HIIT, Tabata, EMOM, boxing, circuits
Multi-timer
Up to 12 named countdowns running at once
Several dishes, laundry, a class of groups
Alarm clock
Rings at a time of day, once or repeating
Wake-ups, meetings, medication reminders
How to set a timer online for any number of minutes
Open the Timer tab, click the big time display and type the digits, just like a microwave: 5 then 0 then 0 gives 5 minutes, 1 3 0 gives 1 minute 30 seconds, and 1 0 0 0 0 gives 1 hour. Press Enter or Start. You can also tap a preset (30 seconds up to 90 minutes), or reuse one of your recent times. While it runs, add 30 seconds, 1 minute or 5 minutes, or take 30 seconds off, without restarting. Turn on Loop to repeat the same countdown automatically, or give the timer a label so the alarm tells you what finished. Share link copies a web address that opens the tool with your exact time already set, and the popular lengths below open with one click.
Press Start, then Lap (or the L key) each time you finish a lap, round or attempt. The clock never stops while you record. Each lap shows its own time, the change from the previous lap, and the running total. With two or more laps, the fastest is marked Best in green and the slowest in red. Above the table you get the lap count, average lap, fastest, slowest and a consistency figure (the standard deviation of your laps), so you can see at a glance whether you're holding pace or fading. Choose whole seconds, tenths, hundredths or thousandths of a second. Copy the laps straight into Excel or Google Sheets, download them as CSV, or press Save & reset to keep the time in your saved list with a name you choose.
Column
What it means
Lap time
How long that lap took on its own (also called a split)
vs previous
Faster (green, minus) or slower (red, plus) than the lap before
Total
Elapsed time on the stopwatch when you pressed Lap
Consistency
Standard deviation of your lap times: the smaller, the steadier
Interval timer for HIIT, Tabata and circuits
The Intervals tab runs a whole workout for you. Pick a preset or set your own work and rest times, the number of rounds, and optionally several sets with a longer break between them, plus a get-ready countdown and a cool-down. The screen turns green for work and amber for rest, shows the round and set, the next interval and the time left in the whole workout. You'll hear three short beeps before each change and a spoken Go, Rest and round number (turn either off in Settings). Skip forward or back an interval at any time, or press S to skip. The standard Tabata protocol, 20 seconds of all-out effort and 10 seconds of rest for 8 rounds, comes from Izumi Tabata's 1996 study of high-intensity intermittent training.
Preset
Work / rest
Rounds
Total
Tabata
20 s / 10 s
8
4 min, including 10 s get ready
HIIT 40/20
40 s / 20 s
10
about 10 min
30/30
30 s / 30 s
10
about 10 min
EMOM 10
60 s, no rest
10
10 min
Boxing rounds
3 min / 1 min
12
about 47 min
Circuit 3×5
45 s / 15 s
5 rounds × 3 sets
about 20 min with breaks and cool-down
Plank
60 s / 30 s
3
about 4 min
Full screen timer for classrooms, exams and presentations
Press F or the full screen button and the clock fills the screen in large, high-contrast digits that can be read from the back of a room. The countdown ring turns amber near the end and red in the last ten seconds. With Count overtime after zero turned on (it is by default), the timer keeps going after zero and shows how far over you are, like +01:20 in red, which is exactly what speakers and exam invigilators need. For your own screen, the floating mini timer (P, in Chrome and Edge) stays on top of other windows while you present slides or work in another app, and the browser tab shows the time left plus a small progress ring in its icon.
Many online timers stop or slow down as soon as you switch tabs. That's because they update the clock with requestAnimationFrame, which browsers pause completely in hidden tabs, or with page timers, which browsers throttle to about once a second (and Chrome can limit to once a minute after a tab has been hidden for five minutes). This tool avoids both problems. Every clock is saved as an exact start or end time, and a Web Worker checks it four times a second, because worker timers aren't paused the same way. When a countdown reaches zero in a background tab, the alarm plays and a desktop notification appears on time. Because the times are saved, a timer or stopwatch also survives a page refresh. One real limit remains: no website can ring after you close the tab or while your computer is asleep.
Method
In a hidden tab
Used here
requestAnimationFrame
Paused completely
Only to animate the visible stopwatch
setInterval / setTimeout
Throttled to 1 s or slower
No
Web Worker timer + saved end time
Keeps running on time
Yes, for every clock
Alarm sounds, notifications and privacy
Choose from six alarm sounds (digital beep, bell, chime, kitchen timer, wood block or a soft tone), set the volume, and decide how long the alarm keeps ringing: once, 15 seconds, 30 seconds, 1 minute or 5 minutes. It repeats until you press Stop alarm or Esc. The sounds are synthesized in your browser with the Web Audio API, so nothing is downloaded. Browsers only allow sound after you've interacted with a page, so click anywhere or press Start once and the alarm can ring later from a background tab. Desktop notifications are optional. Keep screen awake stops phones and laptops dimming while a clock runs. Everything you set up is stored in your browser's local storage and never sent to a server.
Open the Timer tab, click the time and type digits like a microwave (500 = 5 minutes, 130 = 1 minute 30 seconds), or tap a preset such as 10 min. Press Start or Space. The alarm rings at zero until you press Stop alarm or Esc.
Does the timer keep running if I switch tabs or minimize the browser?
Yes. Every clock is saved as an exact end time and checked by a Web Worker, which browsers don't pause in background tabs, so the countdown stays exact and the alarm rings on time. It can't ring after you close the tab or while your computer is asleep.
What happens if I refresh or close the page by accident?
Reload and everything comes back: a running stopwatch or timer continues from the right time, and your laps, multi-timers and alarms are restored. They're saved in your browser's local storage. If a timer ran out more than a minute before you came back, it shows as finished instead of suddenly ringing.
How do I record laps on the stopwatch?
Start the stopwatch, then press Lap or the L key at the end of each lap. The clock keeps running. Each lap shows its own time, the difference from the previous lap and the total, and the fastest and slowest laps are highlighted.
Can I export my lap times?
Yes. Copy puts the laps on your clipboard as a table that pastes straight into Excel or Google Sheets, and CSV downloads a file with lap times and totals in milliseconds. Save & reset keeps the total in a saved list you can name and export too.
How accurate is the stopwatch?
It reads the browser's high-resolution clock (performance.now), which is precise to well under a millisecond, and you can display up to thousandths of a second. The practical limit is your reaction time when pressing the button, typically 150 to 250 ms, so for fair timing use the Space and L keys consistently.
Can I run more than one timer at the same time?
Yes. The Multi-timer tab runs up to 12 countdowns at once, each with its own name, ring and alarm, and you can start, pause or reset them all together. The stopwatch, main timer, interval timer and alarms also keep running when you switch tabs within the tool.
Is there a Tabata or HIIT interval timer?
Yes. The Intervals tab has presets for Tabata (20 s work, 10 s rest, 8 rounds), HIIT 40/20, 30/30, EMOM, boxing rounds, circuits and planks, or set your own work, rest, rounds, sets, rest between sets, get-ready and cool-down. It beeps 3-2-1 before each change and can speak Go, Rest and the round number.
Can the timer show how far over time I am?
Yes. With Count overtime after zero turned on (the default), the timer keeps counting after zero and shows +00:45 in red. It's useful for talks, meetings and exams where you need to know how far over you've run.
How do I make the timer full screen?
Press F or the full screen button at the top right. The time fills the screen in large digits, readable across a classroom or meeting room. Press F or Esc to exit. In Chrome and Edge you can also press P for a small floating timer that stays on top of other windows.
Can I change the alarm sound or make it louder?
Open Settings to choose from six sounds (digital, bell, chime, kitchen timer, wood block, soft tone), set the volume, and choose how long it keeps ringing, from once to 5 minutes. Also turn up your device volume, since the page can't go above it.
Why didn't the alarm make a sound?
Browsers block sound until you interact with a page, so click anywhere or press Start once before the alarm is due. Check that the tool isn't muted (M), your device isn't on silent, and the tab isn't muted in the browser. On iPhone, the ring/silent switch also silences web audio.
Can I set an alarm for a specific time of day?
Yes. In the Alarm clock tab, pick a time, add a label, and choose once, every day, weekdays or weekends. When it rings you can stop it or snooze for 5 minutes. Keep the tab open (it can be in the background) because a website can't ring once it's closed.
Can I share a timer or open one straight from a link?
Yes. Share link copies an address like /productivity/timer-stopwatch#timer=10m that opens the timer with that time already set, including its label. You can write links yourself too: #timer=1h30m, #timer=90s or #interval=20/10x8 for a Tabata.
Does it work on phones and tablets?
Yes, it works in Safari, Chrome and other modern mobile browsers, with large touch buttons. Keep screen awake stops your phone dimming while a clock runs. For alarms on a phone, keep the browser open, because mobile systems pause web pages more aggressively in the background.
Is this online timer free, and does it need an account?
It's completely free, with no sign-up and no download. Your timers, laps and alarms are stored only in your browser and aren't uploaded anywhere.
What's the difference between a timer and a stopwatch?
A stopwatch counts up from zero to measure how long something takes, and can record laps along the way. A timer counts down from a set time and alerts you when it reaches zero. Use a stopwatch for measuring and a timer for limiting.
