About this countdown timer
A countdown timer counts down from a time you choose to zero, then alerts you that the time is up. Set the hours, minutes and seconds, press start, and watch the large display tick down — then get a clear alarm beep and a "Time's up!" message when it finishes. People use it for cooking and baking, exercise intervals, focused work or study sessions, presentations, and any task where you want a hard stop. The timer counts down toward a fixed clock target, so it stays accurate and does not drift even if your computer is busy. The alarm uses your browser's built-in sound — nothing is uploaded and no files are downloaded.
Frequently asked questions
- How accurate is the countdown timer?
- It stays accurate by counting down to a fixed target time rather than just subtracting one second at a time, so it does not drift even if the tab is busy.
- Will it make a sound when the time is up?
- Yes. When the timer reaches zero it plays a repeating alarm beep and shows a Time's up message. Press Stop alarm to silence it.
- Does the timer keep running if I switch tabs?
- Yes. Because it counts down toward a real clock target, the remaining time is correct when you come back, and the alarm fires when zero is reached.