"I'm late, I'm late, for a very important date!!!"
Free online stopwatch — precise to the millisecond
Start Timing Free — No Signup Needed
No download · Works on any device · Free forever
Never be late for your Zoom meeting again — check the world clock
Free Online Stopwatch
Our free online stopwatch lets you time any event directly in your browser — no download, no signup required. Hit Start to begin counting up to the millisecond, Lap to record split times, and Reset to start fresh. The live time also appears in your browser tab so you can track it from any window.
Frequently Asked Questions
How accurate is this online stopwatch?+
TimerHub uses requestAnimationFrame with Date.now() snapshots, giving you millisecond-level accuracy limited only by your browser's timer resolution — typically within 1–4ms.
Can I record lap times?+
Yes. Press the Flag button while the stopwatch is running to record a lap. Each lap shows the individual lap time and the running total, so you can compare splits at a glance.
Does it work on mobile?+
Yes — TimerHub is fully responsive and works on any smartphone or tablet browser without installing an app.
Will the stopwatch stop if I switch tabs?+
No. The timer keeps running in the background. When you return to the tab the display will instantly show the correct elapsed time.