Stopwatch
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Professional Online Stopwatch
Track time with millisecond precision, record unlimited laps, and export your data instantly. Runs perfectly in your browser with zero installation.
worker.js
setInterval(() => {
postMessage({ type: 'UPDATE' })
}, 10);
Background thread synced perfectly
Uncompromising accuracy, even in the background.
Standard browser timers drift or pause when you switch tabs. Our stopwatch uses a dedicated background Web Worker to ensure perfect millisecond precision, regardless of what else your device is doing.
Maintains precision when tab is inactive
Resistant to browser throttling
Accurate down to the millisecond
Export laps to CSV instantly.
Whether you are timing sprint intervals, tracking presentation lengths, or logging workflow analytics, you can download all your lap data directly to a spreadsheet for deeper analysis.
stopwatch_laps.csv
Lap
Lap Time
Total Time
1
01:12.45
01:12.45
2
01:08.20
02:20.65
Built for reliable timing.
A clean, ad-free interface hiding powerful technical features designed to ensure you never lose your timing data.
Session Persistence
Accidentally closed the tab or refreshed the page? No problem. The stopwatch state and your lap history are continuously saved locally.
localStorage
SavedStopwatchTime
145820
Zero Latency Controls
Instant response buttons ensure your lap times are recorded exactly when you click.
No Installation
Completely web-based. Works on any operating system without downloading apps.
Fully Responsive
Beautifully designed to work seamlessly across massive desktop monitors and small mobile screens alike.
Frequently Asked Questions
Everything you need to know about using the online stopwatch.
Ready to start timing?
Jump into the app and experience precise, reliable web timing instantly.