Online Stopwatch and Countdown Timer
Run a live countdown or stopwatch with start, pause, resume, reset and stopwatch laps. Works locally in your browser.
Set your values
Adjust the values, then calculate your result.
How to use Online Stopwatch and Countdown Timer
- Choose countdown or stopwatch and select Open timer.
- Set a countdown duration when using countdown mode.
- Use the live Start, Pause, Resume and Reset controls; record laps in stopwatch mode.
Measure a duration with live controls
Choose a countdown to run toward zero, or a stopwatch to count upward. Start, pause and resume the live display without losing the elapsed duration, or reset it to begin again. Stopwatch mode can keep up to one hundred lap readings. The copy-time control copies the displayed time rather than only the setup values. These controls work locally and do not send timing data to the conversion server.
Keep the browser timing limits in mind
The display uses a monotonic browser clock to reduce ordinary interval drift while the page is running. Browser throttling, operating-system sleep, tab closure and page reloads can still affect what is displayed or stop the session. It does not provide a guaranteed background alarm, notification or saved timer history. Countdowns support one second through twenty-four hours. Changing the setup and reopening the timer starts a new session, so keep the current page open when timing matters.
Does the timer work after I close the page?
No. Keep the page open. The timer is a local browser session and does not create a server alarm or persistent notification.
Is input uploaded?
Processing takes place in your browser. This tool does not send your input or selected files to a conversion API.