Stopwatch & Countdown

Precise timing
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Stopwatch & Countdown · How to use · FAQ · Related tools

00:00.000
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00:30

How to use

Stopwatch

  1. Click Start to begin timing.
  2. Click Pause to pause; click Start again to resume.
  3. Click Reset to clear back to 00:00.000.
  4. Keyboard: Space toggles Start/Pause, R resets.

Countdown

  1. Enter Minutes and Seconds.
  2. Click Start Countdown (or press Enter).
  3. When it reaches 00:00, you’ll hear a short beep.
  4. Click Stop (or press Esc) to cancel.

Tips

FAQ

How do I use the stopwatch?

Click Start to begin, Pause to pause, and Reset to clear. Keyboard: Space toggles Start/Pause, R resets.

How do I set a countdown?

Enter minutes and seconds, then click Start Countdown. You will hear a short beep when it reaches 00:00.

Will it stay accurate if I switch tabs?

Yes. The timer uses monotonic time and timestamps to avoid drift. The display stays accurate even if the tab is throttled.

Why can’t I hear the beep?

Most browsers block audio until you interact. Click anywhere first or press a button to unlock audio. Also check Silent mode and volume.

Are my timings or inputs saved?

No data is sent to a server. Everything runs locally in your browser.