Can I use keyboard shortcuts?

Yes. Space bar starts/stops. L records a lap (stopwatch). R resets. These work when the tool area is focused.

Does the timer work in background tabs?

The timer uses performance.now() for accuracy and corrects for any drift when the tab becomes visible again. For best accuracy, keep the tab in the foreground.

⏱ Stopwatch & Timer

A precise stopwatch with lap tracking and a countdown timer with audio alert — all running in your browser with no install required.

Lap Times Countdown Keyboard Shortcuts

00:00.000

Space Start/Stop L Lap R Reset

Hours

:

Minutes

:

Seconds

05:00

⏰ Time's up!

Space Start/Stop R Reset

FAQ

How accurate is the stopwatch?

The stopwatch uses performance.now() which provides sub-millisecond resolution. The display updates every ~50 ms for smooth rendering. The time measurement itself is as precise as your browser allows.

What keyboard shortcuts are available?

Click the tool area first to focus it, then: Space starts/stops, L records a lap (stopwatch only), R resets. These match common physical stopwatch buttons.

Does the countdown play a sound?

Yes — when the countdown reaches zero, the tool plays a short beep using the Web Audio API. Make sure your browser tab is not muted. No audio file is downloaded; the sound is synthesized in-browser.

Can I use this on mobile?

Yes. The layout is responsive and touch-friendly. Tap the buttons directly. Keyboard shortcuts require a physical keyboard.