Stopwatch
Simple stopwatch timer
This free online stopwatch runs in your browser and is part of our Utilities collection.
Stopwatch
Simple stopwatch to track time with lap recording.
00:00:00.000
Keyboard Shortcuts:
- Space: Start/Pause
- L: Record Lap
- R: Reset
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Instant In-Browser Execution
Runs locally in JavaScript without wait times or server delays.
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100% Privacy & Security
Your inputs and files are never stored or logged on remote servers.
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Cross-Device Responsive
Fully optimized for mobile smartphones, tablets, and desktop displays.
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100% Free Forever
No subscription fees, no signups, and no software installations.
How to Use the Online Stopwatch
1
Start Stopwatch
Click the "Start" button to begin high-precision elapsed time measurement.
2
Record Lap Times
Click "Lap" while running to record split times, cumulative elapsed intervals, and fastest/slowest lap statistics.
3
Pause & Resume
Click "Pause" to temporarily halt the timer without resetting recorded laps, then click "Resume" when ready.
4
Reset or Export Laps
Click "Reset" to return the display to zero, or export your lap breakdown list for sports, productivity, or testing logs.
Frequently Asked Questions
Common questions about using this free online stopwatch.
How accurate is this browser stopwatch? ▾
The stopwatch uses the high-resolution `performance.now()` browser timestamp API, delivering sub-millisecond precision unaffected by system clock adjustments or battery throttling.
Does the stopwatch keep running if I switch browser tabs? ▾
Yes. Elapsed time is calculated using actual monotonic epoch time differences rather than simple interval ticks, so switching tabs or minimizing the window will not cause time drift.
Can I use keyboard shortcuts to control the stopwatch? ▾
Yes. You can press the Spacebar to start or pause the stopwatch and press the 'L' key to record a lap without using your mouse.
Is there a limit on how many laps can be recorded? ▾
You can record hundreds of laps in a single session. The lap table automatically tracks split deltas and ranks your best and worst times.
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