Is the timer accurate?

The timer uses the browser's performance.now() API for high-resolution timing, accurate to sub-millisecond precision. Note that browser tab throttling may reduce accuracy when the tab is in the background.

Can I set a custom countdown?

Yes. Switch to Countdown mode, enter hours, minutes, and seconds, then press Start. The browser will play an alert sound when time expires.

Does it work offline?

Yes. The entire timer runs in your browser with no server connection required.

Will laps be saved if I close the tab?

No. Lap data is stored only in memory and will be lost when you close or refresh the page. Export your laps with the Copy button if you need to save them.

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Stopwatch & Countdown Timer

Browser-based stopwatch with laps and countdown timer — runs offline, no installation needed.

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About this tool

A dual-mode timer: stopwatch mode records laps with split times, countdown mode alerts you when time is up. Works entirely in your browser — no app needed. Accurate to milliseconds.

How to use

1 Select Stopwatch or Countdown mode.
2 Press Start to begin. For countdown, set the time first.
3 Press Lap to record a split time while the stopwatch runs.
4 Press Stop then Reset to start over. Copy Laps to save your results.

Frequently Asked Questions

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