00:00

Keep this tab open with the sound on. The timer keeps correct time in a background tab, but a phone or laptop that goes to sleep may delay the alarm until you wake it; turn on Keep screen on for long timers.

Options

4 second timer

Press Start and an alarm will ring in exactly 4 seconds. Good for box breathing (4 seconds in, hold, out, hold).

The timer keeps exact time in a background tab and shows the time left in the tab title. Press Space to pause, R to reset, F for full screen.

Other timers

Seconds

Minutes and hours

Set a custom timer · Stopwatch · Pomodoro timer · Classroom timer