Free Stopwatch
Stopwatch times events in hundredths of a second from the system clock, records laps and splits, and highlights the fastest and slowest laps. Keyboard shortcuts are Space to start or stop, L for a lap and R to reset. It keeps counting across page reloads, offers full screen, and exports laps as CSV.
- Display:
- Hundredths of a second
- Shortcuts:
- Space, L (lap), R (reset)
- Export:
- Laps as CSV
- Price:
- Free
- Runs:
- Locally, in your browser
- Uploads:
- None: files never leave your device
- Account:
- Not needed
Quick answers
How accurate is the stopwatch?
It measures from the system clock and displays hundredths of a second. It does not drift, even if the tab is in the background.
Processed on your device: your files are never uploaded. How it works
Network activity in this tab
What this page has requested since you opened the site in this tab. An upload is any request that sends data: POST, PUT, PATCH or a request with a body.
No uploads: nothing has been sent from this page.
No network requests yet.
To see every request, open your browser's developer tools (Network tab).
How to use the Stopwatch
- Press Start (or Space) to begin timing.
- Press Lap (or L) to record split times; the fastest and slowest laps are highlighted.
- Stop with Space, reset with R, and export your laps as CSV.
Credits & open source
Built from scratch on web standards. Thank you to the people who make these projects.
Web platform APIs used: Keyboard Events, Fullscreen API, Screen Wake Lock API, localStorage, File API.
Full license texts: third-party notices · all credits
Frequently asked questions
What happens if I close or reload the page?
The start time and laps are stored in your browser, so the stopwatch is still running when you come back.
What are the keyboard shortcuts?
Space starts and stops, L records a lap and R resets.