Will it make a sound when the time is up?
Yes. A short two-note chime plays at zero, synthesized in the browser, so no audio file is downloaded. Some browsers block sound until you have interacted with the page, and pressing Start counts as that interaction.
Can I set a timer for 30 seconds?
Not exactly. The input is in whole minutes with a minimum of 1, so the shortest countdown is one minute. For shorter intervals, the stopwatch counting up may be more practical.
Can I pause a running countdown?
Yes. Start becomes Pause while the timer runs, and pressing it again resumes from where you stopped. Reset clears it back to zero.
Does the countdown keep running if I switch tabs?
The time keeps being counted correctly, because the timer measures the real clock rather than counting ticks. What suffers is the display and the moment of completion, both of which can lag by up to a minute while the browser throttles the hidden tab.
Does it work offline?
Yes, once the page has loaded. It runs entirely in your browser with no server call at any point.
How do I set a timer for 10 minutes?
Type 10 in the minutes field and press Start. The display counts down from 10:00 and the chime plays at zero. Any whole number of minutes works the same way, so 5, 15, 25, or 90 is just a different number in the same field.
Can I use the timer in fullscreen?
There is no dedicated fullscreen button, but the browser's own fullscreen mode works: press F11 on Windows or Control plus Command plus F on a Mac. The remaining time is drawn in large tabular digits, so it stays readable from across a room either way.
Why did I not hear the chime?
Usually because the browser blocked audio. Browsers only allow sound after you have interacted with the page, and pressing Start normally counts, but a muted tab, a muted system, or strict autoplay settings will keep it silent. For anything where missing the end has a real cost, set a phone alarm as backup.
Is the online timer free?
Yes, with no signup, no ads gating the alarm, and no install. It is a small script running in your browser tab, and nothing about your timing is sent anywhere.
Can I set hours instead of minutes?
Enter the total in minutes: 60 for an hour, 120 for two. Once the remaining time crosses an hour the display switches to an hours, minutes, and seconds format, so a long countdown stays readable.
Is this the same as a stopwatch?
No. This timer counts down from a duration you set and announces the end; a stopwatch counts up from zero until you stop it. If you want to measure how long something takes rather than be told when time is up, use the online stopwatch instead.