Countdown Timer & Online Stopwatch
A free countdown timer with an alarm and quick presets, plus a precise online stopwatch with lap times — no signup, everything runs in your browser.
00:00:00
Set a time and press Start
Quick presets:
00:00:00.00
Press Start to begin
Laps
No laps yet. Press Lap while the stopwatch runs.
How to use
- Countdown: enter hours, minutes and seconds (or tap a preset chip), then press Start. Pause to freeze, Reset to restore your entered time.
- When the countdown reaches zero, the screen flashes and a beep alarm sounds.
- Stopwatch: press Start to begin timing with millisecond precision. Press Lap to record a split time while it keeps running.
- The lap list shows each lap time and the running total. Reset clears all laps.
Tips
- Use the 25-minute preset for focused study or work sessions (the Pomodoro technique).
- Keep the browser tab open and your volume up so you hear the countdown alarm.
- The stopwatch stays accurate even if the tab is briefly hidden, because it measures real elapsed time.
Frequently Asked Questions (FAQ)
How do I start a countdown?
Enter hours, minutes and seconds, or tap a preset chip for 5, 10, 25 or 60 minutes, then press Start. Pause freezes the timer and Reset restores the time you entered.
What happens when the countdown reaches zero?
The screen flashes and a beep alarm sounds. Keep the browser tab open and your volume up so you hear the alarm.
How does the online stopwatch work?
Press Start to begin timing with hundredth-of-a-second precision. Press Lap to record a split time while it keeps running; the lap list shows each lap time and the running total. Reset clears all laps.
Does the stopwatch stay accurate if I switch browser tabs?
Yes. The stopwatch measures real elapsed time, so it stays accurate even if the tab is briefly hidden.