Stopwatch
Simple online stopwatch.
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About Stopwatch
A precise, no-frills online stopwatch. Press Start to begin timing, Stop to pause, and Resume to continue where you left off. Record laps to capture splits without interrupting the clock, and Reset to clear everything. The display shows hours, minutes, seconds, and centiseconds, updated smoothly for accurate, drift-free timing.
It is completely free with no sign-up, no ads, and no limits. Everything runs entirely in your browser using your device's high-resolution clock, so nothing is sent to a server and your timing sessions stay private on your own machine.
Frequently asked questions
- Is this stopwatch free to use?
- Yes, it is 100% free with no sign-up, no account, and no limits. You can start, stop, lap, and reset as many times as you like at no cost.
- Is my data uploaded or stored anywhere?
- No. The stopwatch runs entirely in your browser using your device's clock. No timing data is uploaded, tracked, or saved to any server, so your sessions stay completely private.
- How accurate is the timer?
- It uses the browser's high-resolution performance.now() clock and redraws with requestAnimationFrame, so the elapsed time is measured precisely and stays free of the drift that plain interval timers accumulate.
- What does the lap feature do?
- Lap records a marker while the clock keeps running. Each lap shows its own split (time since the previous lap) and the cumulative total, and it highlights your fastest and slowest laps for easy comparison.
- Can I pause and resume the stopwatch?
- Yes. Press Stop to pause the clock without losing your time, then press Resume to continue counting from where you left off. Reset clears the elapsed time and all laps.
- Does it keep running if I switch tabs?
- The elapsed time is calculated from timestamps, so when you return to the tab the time shown is still correct. Some browsers throttle background tabs, which can slow the on-screen refresh, but the measured total stays accurate.