Countdown Timer and Stopwatch
A simple online timer with an alarm, a countdown to any date and time, and a stopwatch with lap times — in one page.
Result
Choose a timer, a countdown to a date, or the stopwatch.
How to use this tool
- Timer: enter a duration like 5:00 or 1h 30m and press Start.
- Countdown: choose a date and time.
- Stopwatch: press Start, then use Lap and Pause.
How it works
Time is measured from your device’s clock, so it stays accurate even if the tab is in the background. A short beep is played with Web Audio when time is up.
Example
A cooking timer
Enter 12:00 for a 12-minute timer; the tab title counts down while you work elsewhere.
Privacy and limitations
- Everything runs in your browser; nothing you enter is uploaded or stored.
- Keep the tab open for the alarm to sound.
Frequently asked questions
Will the alarm play if the tab is in the background?
Yes, as long as the tab stays open and sound is not muted.
What duration formats work?
5:00, 1:30:00, 90 (minutes), 1h 30m or 45s.