A 30 second timer is short enough that the setup usually takes longer than the interval itself, which is why this page opens with 30 seconds already loaded and one button to press. Half a minute is the standard interval for a surprising number of things: handwashing guidance in most health services is 20 to 30 seconds, plank and wall-sit sets in beginner routines start here, and it is the usual contact time for disinfectant sprays to actually work before wiping. It is also the interval most often used for rest between sets in circuit training, where the point is to keep the heart rate up rather than fully recover. The timer counts down using wall-clock time rather than counting ticks, so it stays accurate even if the tab is throttled in the background. When it reaches zero it alerts you, and the progress bar gives you a rough sense of the remaining time without reading the digits. Longer intervals for the same kind of work are on 1 Minute Timer and 2 Minute Timer.
Countdown Timer is a flexible tool that covers both short-duration timers measured in minutes and seconds and long-duration countdowns to calendar dates measured in days, hours, minutes, and seconds. Short-duration timers are the more common daily use case: a 20-minute timer for a Pomodoro work session, a 7-minute timer for a rest between sets, a 12-minute timer for cooking pasta. Long-duration countdowns are used for event planning and motivation: a website launch date, a product release, an exam or presentation deadline, or a personal milestone. The audio alert at zero ensures the timer is useful even when the browser tab is not visible, such as when cooking or exercising and the screen is not being watched. For structured interval-based work, Pomodoro Timer provides an automated version that cycles through work and break periods without requiring manual resets, which is more convenient than manually setting a countdown timer for each session. Countdown Timer is more flexible for one-off or non-standard durations. The timer uses the browser's requestAnimationFrame loop for the display update and tracks elapsed time using the high-resolution performance.now() API, which provides accuracy that is not affected by the system clock being adjusted during the countdown. The tool works reliably when the browser tab is in the background on desktop browsers, though mobile browsers may throttle background JavaScript execution to reduce battery drain. The tool runs free in the browser without installation.