00:00:00.000
Professional Online Stopwatch
Our professional online stopwatch is designed for precision and reliability. Whether you're timing a sprint, measuring code execution, or tracking productivity intervals, this tool provides millisecond accuracy directly in your browser without requiring any plugins or app downloads.
Key Features
- Millisecond Precision: Utilizing the high-resolution time API built into modern browsers to guarantee exact timing.
- Split/Lap Tracking: Record unlimited laps and view both the individual lap time and the total running time simultaneously.
- Zero Battery Drain: Optimized with
requestAnimationFrameto pause visual rendering when the tab is hidden, saving CPU cycles while the timer keeps ticking in the background. - Privacy First: 100% client-side. No timing data is ever sent to a server.
Frequently Asked Questions
Will the stopwatch continue running if I switch tabs?
Yes. The stopwatch calculates elapsed time based on absolute system timestamps rather than counting frames. Even if you switch tabs or minimize the browser, the time will be perfectly accurate when you return.
Is there a limit to the number of laps I can record?
No, you can record as many laps as you need. The lap interface will automatically scroll to show your most recent splits.