Set a 30 minute timer
Half an hour is set in the fields. Press Start, or Space, to begin the countdown.
- Runs on your device
- No sign-up
- Works offline after a visit
| Lap | Lap time | Total |
|---|
Keys: Space starts or pauses, R resets, and L records a lap on the stopwatch.
The page opens with 30 minutes in the minutes field, so the display reads 30:00. Thirty minutes is 1,800 seconds, half an hour. The countdown reads the clock, so switching to another tab does not change the time left, and the tone sounds at zero.
If you want the countdown visible for the whole half hour, tick Keep the screen on while it runs, where the browser supports it. For a longer block, the 1 hour timer starts from 60 minutes.
How to set a countdown timer
- Pick a preset, or type hours, minutes and seconds, then press Start.
- Switch to Stopwatch for laps, and press Lap or L to record each one.
- Switch tabs if you like. The time stays right, and a tone sounds when a timer reaches zero.
Questions
Why is there no 30 minute button?
The quick buttons on the timer are 1, 3, 5, 10, 15 and 25 minutes. For 30 minutes, type 30 into the minutes field, then press Start or Space.
Can I pause for a call and carry on?
Yes. Press Space to pause and Space again to carry on. The remaining time is kept, so the tone sounds when the rest of the countdown runs out.
Why does the timer stay accurate when I switch tabs?
It reads the clock rather than counting ticks. When it starts, it saves the end time, and each update subtracts the current time from that. Browsers slow down timers in background tabs, so a counter that adds one per tick can drift. This one does not.
Will the sound play if the tab is in the background?
The tone is made in the browser and scheduled on the audio clock when the timer starts, so it sounds at the end time even if the tab is in the background. The page title shows the time left while it runs. Your device volume and mute settings still apply, and on phones the browser may stop sound when the screen locks, so keep the page open and the volume up.
Does the screen stay on while the timer runs?
Only if you tick the box, and only where the browser supports the Screen Wake Lock. The browser releases the lock when the tab is hidden, so the page asks again when you come back.
What do the lap times mean?
Each lap time is the time since the previous lap, and the total is the time since the stopwatch started. Reset clears the laps. Nothing is saved after you close the page.
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