Stopwatch & Timer
Precise stopwatch with lap times and countdown timer with alarm. Keyboard shortcuts, fullscreen support — works in the background.
How to Use
Stopwatch
Press Start (or the Space bar) to begin timing. The display updates in real time with hours, minutes, seconds, and centiseconds. Press Lap to record a split time — each lap shows the total time and the interval since the last lap. All laps are listed below the display. Press Stop to pause and Reset to clear everything.
Countdown Timer
Enter hours, minutes, and seconds, or use the quick presets (1, 3, 5, 10, 15, 30, 60 minutes). Press Start to begin the countdown. When the timer reaches zero, an alarm beep plays and the display flashes. The timer uses the system clock, so it stays accurate even if you switch tabs or lock your screen.
Tips
Both modes support keyboard shortcuts for hands-free operation: Space to start/stop, L for laps (stopwatch only), and R to reset. The timer works in the background and uses performance.now() for millisecond precision. Great for cooking, workouts, presentations, exams, meetings, and any situation where you need precise timing.
Frequently Asked Questions
Press Start or Space to begin. Press Lap to record split times. Press Stop to pause, Reset to clear.
Switch to Timer tab, enter hours/minutes/seconds or use presets, press Start. An alarm plays when it reaches zero.
Space = Start/Stop, L = Lap (stopwatch), R = Reset. Works in both modes.
Yes. It uses the system clock, not intervals, so it remains accurate when the tab is in the background or the screen is off.
Yes. The countdown timer plays a beep sound when it reaches zero using the Web Audio API. Make sure your device volume is on.