Online Stopwatch
A precise, distraction-free stopwatch in your browser: start, pause, reset, and record lap times with automatic split calculation.
FAQ
How accurate is the stopwatch?
It reads your device's high-resolution clock, so precision is to the millisecond — far beyond human reaction time.
Does it keep running if I switch tabs?
Yes — timing is based on elapsed wall-clock time, so switching tabs or briefly locking the screen doesn't lose time.
Can I copy the lap times?
Yes — one click copies the full lap list to your clipboard.