Date & Time
Online Timer & Stopwatch
Set a countdown timer with an alarm, or run a stopwatch that records laps to the hundredth of a second. Pick a preset for a quick 5- or 10-minute timer, or type an exact duration for workouts, cooking, study sprints, and presentations. Everything runs in your browser — the countdown stays accurate in a background tab and keeps counting wall-clock time even if your computer sleeps.
05:00
Duration
Presets
00:00.00
Laps
Press Lap while the stopwatch runs to record a split.
| Lap | Split | Total |
|---|
How to use the countdown timer
- Tap a preset — 5 min, 10 min, 25 min for a Pomodoro — or type the hours, minutes, and seconds you need.
- Press Start. The big readout counts down and the bar underneath fills as the time is spent.
- Pause stops the clock without losing your place; Reset puts the full duration back.
- When it reaches zero the display turns red and an alarm plays. Untick Alarm sound if you need a silent countdown.
Keyboard shortcuts: Space starts or pauses, R resets, and L records a lap in stopwatch mode.
Stopwatch with lap times
Switch to the Stopwatch tab to count up instead of down. Every press of Lap records a split alongside the running total, and the fastest and slowest laps are marked once you have at least two — useful for interval training, lap running, drills, and timing repeated tasks. Copy laps puts the whole table on your clipboard as tab-separated text, ready to paste into a spreadsheet.
Timer or stopwatch — which do you need?
A timer counts down from a duration you choose and alerts you at zero: use it when you know how long something should take, like a 3-minute egg, a 25-minute focus block, or a 5-minute speaking slot. A stopwatch counts up from zero with no end point: use it when you want to find out how long something takes, such as a lap, a workout set, or a support call.
Frequently asked questions
Does the timer keep running if I switch tabs?
Yes. The countdown is calculated from the clock time you started it, not from counting frames, so a background tab that gets throttled still shows the correct time the moment you come back — and the alarm is scheduled separately so it fires even while the tab is hidden.
Is the timer accurate if my computer goes to sleep?
Yes. The tool reads wall-clock time rather than a monotonic frame counter, so ten minutes of sleep counts as ten minutes of countdown. When you wake the machine the display jumps to the correct remaining time, and a timer that expired while asleep is shown as finished.
How accurate is the online stopwatch?
The stopwatch records and displays hundredths of a second. Practical accuracy is limited by human reaction time on the start and stop presses, which is typically 150–250 milliseconds, so treat it as precise to roughly a quarter of a second for hand-timed events.
Can I link directly to a 5 minute timer?
Yes. Add a t parameter to the URL — for example /timer-stopwatch/?t=5m opens with five minutes preloaded. It accepts values like 90s, 5m, 1h30m, and 00:45, so you can bookmark the exact countdown you use most.
Why can't I hear the alarm?
Check that the Alarm sound box is ticked and that your device is not muted. Browsers only allow a page to play audio after you have interacted with it, so the alarm works because you pressed Start — but it will stay silent if the tab was reloaded and the timer resumed without a click.
Is any of my data sent to a server?
No. The timer, the stopwatch, and your lap times all run entirely in your browser with JavaScript. Nothing is uploaded, stored on a server, or shared, and the page works offline once it has loaded.