Stopwatch
Free online Stopwatch for timing sports, exercises, speeches, and tasks. Features lap tracking, split time comparisons, exportable lap logs, and high-precision millisecond timing powered by performance.now() timestamps. 100% private and runs locally in your browser.
Your files never leave your device. All processing happens on your device. No uploads, ever.
How to use Stopwatch
- 1
Start / Pause
Click Start to launch high-precision millisecond stopwatch.
- 2
Record Laps
Click Lap while running to record intermediate split times.
- 3
Copy Laps or Reset
Copy your lap history or reset to zero anytime.
Timestamp-Based High Precision & Lap Splits
Our Stopwatch uses `performance.now()` hardware timestamps rather than tick counters, ensuring millisecond accuracy even across background browser tabs. Track unlimited laps with instant split-time calculations.
Lap Time Export & Copying
Export recorded lap splits directly to your clipboard for training logs, athletic records, or time studies.
Frequently asked questions
Does the stopwatch continue accurately in background tabs?
Yes! Because elapsed time is computed directly from OS hardware timestamps (`performance.now()`), browser background tab throttling will not cause any timing drift.
Can I copy my lap records?
Yes, click 'Copy Laps' to instantly copy all lap split times to your clipboard in tabular format.
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Last updated 10 August 2026