Stopwatch
00:00:00.00
100%
Ready to start
Keyboard shortcuts: Space = Start/Pause, R = Reset, L = Lap (stopwatch).
Free Online Stopwatch & Timer
Precise stopwatch with lap tracking and countdown timer with alerts. Works in your browser — no app needed.
Stopwatch & Timer
Lap times
No laps recorded yet. Start the stopwatch and press Lap to save splits.
| Lap | Split time | Total time |
|---|
Quick presets
Custom time
Browser notifications
Notifications are optional and only requested in your browser.
Frequently Asked Questions
How accurate is this online stopwatch and timer?
This tool uses Date.now() for elapsed time calculations and requestAnimationFrame for display updates, so it stays accurate even if the tab is briefly backgrounded or the browser throttles repainting.
Will the timer keep counting in a background tab?
Yes. The countdown is based on timestamps rather than interval ticks, so the remaining time is recalculated correctly when you return to the tab.
Does the timer play a sound when time is up?
Yes. When the timer ends, the page generates a simple beep tone with the Web Audio API. No external audio files are downloaded.
Can I use this stopwatch on mobile?
Yes. The stopwatch and timer work on modern phones and tablets in the browser, including touch controls for presets, laps, and reset actions.
Are my lap times or timer settings stored online?
No. Everything runs locally in your browser. The tool does not use external APIs, cookies, or tracking scripts.
Can I export stopwatch laps?
Yes. You can export all recorded laps as a CSV file for later analysis or sharing.