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🛡️ 100% Client-Side • Instant & Auto-Saved Locally

Stopwatch & Countdown Timer

⚡ Quick Tools

Millisecond-precision split lap stopwatch and multi-preset countdown timer with synthesized alarm audio and fullscreen mode.

⭐ 4.8/5 (132 votes)
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Frequently Asked Questions

Quick answers about controls, features, accuracy, and local browser saving.

How accurate is the stopwatch?
The stopwatch utilizes the browser's high-resolution timer (performance.now()) which provides sub-millisecond precision, completely eliminating the drift caused by typical JavaScript timer tick delays.
Does the timer sound an alarm when finished?
Yes! When the countdown reaches 00:00:00, a pleasant multi-tone alert chime sounds via the Web Audio API without needing any external audio file downloads.
Can I use Fullscreen mode for workouts or presentations?
Yes. Click the Fullscreen button (⛶) at the top right to expand the timer into a high-visibility, distraction-free display ideal for gyms, classrooms, and speaking engagements.
Can I copy my recorded stopwatch laps?
Yes! A "Copy Laps" button copies your entire split and lap breakdown with timestamps straight to your clipboard.

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