Online Stopwatch
Press Start below to begin a precision stopwatch with split times, lap notes, and CSV export — all running in your browser, nothing sent to a server.
00:00:00.000
Splits
| # | Label | Split | Total |
|---|
How it works
The stopwatch uses performance.now() for sub-millisecond accuracy and is unaffected by changes to your system clock. Splits are stored locally in your browser; they persist across reloads via localStorage and can be exported as plain text.
Keyboard shortcuts
- Space — start / pause
- L — record a split
- R — reset