Stopwatch & Timer
A clean, precise stopwatch with laps, and a customizable countdown timer.
What is this tool?
The Online Stopwatch and Countdown Timer provides millisecond-precision time tracking directly in your browser. It features a dual-mode interface: a precision stopwatch with split lap recording and difference tracking, and a customizable countdown timer with automatic completion alerts.
How to use the stopwatch and countdown timer
- Choose between Stopwatch mode and Timer mode using the top toggle.
- In Stopwatch mode: click Start to begin timing, Lap to record split times, Pause to halt, and Reset to clear.
- In Timer mode: enter your desired duration in minutes, click Start, and monitor the countdown progress.
- Review your lap history table showing total elapsed time and split difference.
Key Features
- Dual mode: Precision Stopwatch and Countdown Timer in one clean interface
- High-accuracy timing with millisecond display (10ms resolution)
- Lap time recorder tracking cumulative time and individual lap deltas
- 100% browser-based timing with zero tracking or external dependencies
Frequently Asked Questions
How accurate is the online stopwatch?
The stopwatch runs using high-resolution browser timing intervals with 10-millisecond precision, suitable for workouts, cooking, productivity, and study sessions.
How does the lap recording feature work?
While the stopwatch is running, clicking Lap logs your current elapsed time and calculates the time difference since your previous lap, displaying all splits in a clean list.
Does the timer continue running if I switch tabs?
Yes, modern browsers maintain interval timers in background tabs, although background throttling may slightly reduce visual refresh rates until the tab is focused.
Is any data stored or tracked while using the stopwatch?
No. All timing state exists solely in temporary browser memory and resets when you clear the timer or close the page.
Privacy First
Timing runs entirely in your local browser memory. No timers or usage data are stored or uploaded.