Online Stopwatch
Precision stopwatch with lap and split times, keyboard shortcuts and millisecond accuracy. Free and runs in your browser.
Precise, timestamp-based timing that stays accurate even in a background tab. Nothing is uploaded — it runs entirely in your browser.
| # | Lap time | Total |
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About Online Stopwatch
The online stopwatch measures elapsed time with millisecond precision, with lap and split recording built in. Press Lap while running to capture each segment; the table shows every lap time and running total, and flags your fastest and slowest laps automatically.
Because timing is timestamp-based — elapsed time is derived from the system clock, not from counting intervals — it stays accurate even in a background tab, where browsers throttle ordinary timers. A keyboard shortcut (Space to start and pause) keeps your hands off the mouse during timing.
You can copy the full lap table to the clipboard for a training log or spreadsheet. Everything runs locally in your browser, free, with nothing uploaded.
How to use Online Stopwatch
- Press Start — or hit the Space key — to begin timing.
- Press Lap to record a split each time a lap completes.
- Pause and resume as needed; the elapsed time picks up exactly where it stopped.
- Review the lap table with fastest and slowest laps highlighted, and copy the laps if you want to keep them.
- Press Reset to clear the time and laps for the next session.