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30 minute timer
A half hour countdown with an alarm at the end. It keeps running when you switch tabs and survives a page reload.
Free and private. Everything runs in your browser, nothing is uploaded.
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How it works
Press StartThe time is already set. Press Start or the space bar.
Do your thingThe countdown keeps going in another tab, and the tab title shows the time left.
Hear the alarmThe alarm rings when the time is up. Press Start again to repeat.
Half an hour of work or play
Thirty minutes is a natural unit for homework, reading, piano practice and many workouts. Parents use it to limit screen time or gaming, and cooks use it for roasting vegetables, rice and most cakes.
Because the end time is saved on your device, you can close the laptop lid, come back later and the timer is still correct. The ring around the numbers shows at a glance how much of the half hour is left.
See the end time
Under the countdown the timer shows the clock time when it will end, so you know at once that a session started now finishes at, say, 4:35.
Frequently asked questions
Can I see when the timer will finish?
Yes. While it runs, the time of day when it ends is shown under the countdown.
Does the timer work in a background tab?
Yes. The alarm is scheduled when you press Start, so it rings on time even when you are in another tab or app. Keep the tab open.
Will the timer continue if I reload the page?
Yes. The end time is saved in your browser, so the countdown continues. Click anywhere once after a reload so your browser allows the sound.
Can I use it without sound?
Yes. Choose No sound; the tab title and the screen still show when the time is up.
Is it free?
Yes, completely free, with no sign up and no limit.