30 Second Timer
A 00:30 countdown, already dialed in — press Start and get a triple beep plus a flashing display when time is up. Free, no sign-up, and the tab title keeps counting even while you work in another tab.
Minutes
Custom minutes
Custom seconds
A beep plays when the timer finishes — keep this tab's sound on.
What a 30 second timer is good for
Thirty seconds is the classic short burst: a plank hold, the rest between HIIT sets, rinsing after brushing, or a fair turn limit in party games. The alarm beeps and the display flashes the moment it hits zero, so you can look away and just listen.
Need a different length? Change the minutes right in the timer above, or jump to another preset below. For counting up instead of down, use the Online Stopwatch; for counting down to a calendar date, try the Countdown to Date.