Countdown Timer & Online Stopwatch

How to use

1. Countdown: enter hours, minutes and seconds (or tap a preset chip), then press Start. Pause to freeze, Reset to restore your entered time.
2. When the countdown reaches zero, the screen flashes and a beep alarm sounds.
3. Stopwatch: press Start to begin timing with millisecond precision. Press Lap to record a split time while it keeps running.
4. 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.