Stopwatch & Timer — Laps + Countdown Alarm
A precision stopwatch with lap splits, and a countdown timer with presets and an audible alarm. One tool, two modes — keyboard shortcuts, fullscreen display, and it works fully offline.
FreeNo sign-upRuns in your browserUtilitiesApplication
Use Cases
Time workouts and interval training
Time kitchen / cooking tasks
Time a speech or presentation rehearsal
Record split times for running or cycling
Run a Pomodoro-style focus timer with the 25-minute preset and alarm
How to use the online stopwatch and timer
1
Press Start
Click Start (or hit the spacebar) to begin timing. The display updates every millisecond.
2
Record laps
Click Lap (or hit L) to record a split time without stopping the clock. All laps appear in the table below.
3
Pause and resume
Click Pause to stop the clock without resetting. Click Start to resume from where you paused.
4
Reset or switch to Timer
Click Reset to zero the clock, or switch to the Timer tab for a countdown with presets (1–60 min), custom minutes/seconds, and an audible alarm at zero.
Frequently Asked Questions
- How accurate is it?
- Millisecond precision (1 ms) using performance.now(). Browser timer resolution may round to 5ms in some privacy modes.
- Does it run if I switch tabs?
- Yes. The stopwatch continues in the background and stays accurate when you return to the tab.
- Does it work offline?
- Yes. After first load, the page works fully offline.
- Can I record split times?
- Yes. Use Lap (or L key) to record splits. Displayed as both lap time (since last lap) and total time.
- Does it work on mobile?
- Yes. Touch-friendly buttons on iOS Safari and Android Chrome.
- Are my times stored?
- Laps stay in browser memory only and clear on refresh — there is no export or save feature, so note down times you need to keep.
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