Online Stopwatch & Countdown Timer
A clean, accurate stopwatch and countdown timer that runs entirely in your browser. Lap support, audible alarm, no ads, no signup.
00:00:00.00
| # | Lap time | Total time |
|---|
00:05:00
Quick presets:
How accurate is this stopwatch?
The display updates many times per second, but accuracy is measured against your system clock — not against the browser's animation frame. The stopwatch records the start timestamp and computes elapsed time from performance.now() on each tick, so it stays accurate even if the tab is briefly throttled by the browser.
Pomodoro technique
The classic Pomodoro is 25 minutes of focused work followed by a 5-minute break. After four pomodoros, take a longer 15–30 minute break. The 25-minute preset above starts a single Pomodoro session.
Tips
- Keep the tab open in the foreground if you want guaranteed sub-second accuracy. Background tabs can be throttled by the browser.
- The alarm requires sound permission on first use; some browsers require a click on the page before audio can play.
- Laps capture the moment you press Lap — they don't reset the running clock.