Online Countdown Timer with Alarm
Set a countdown in hours, minutes and seconds with an alarm sound. Works in the background and full screen.
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如何使用Countdown Timer
- 1
在此页面打开Countdown Timer，它直接在浏览器中加载。
- 2
添加文件、文本或数值，并调整设置。
- 3
复制或下载结果。不会上传或存储任何内容。
关于此工具
Pick a preset (1, 5, 10, 30 minutes…) or type any hours, minutes and seconds, then press Start (or the space bar). An alarm plays when time is up, even if the tab is in the background.
Use full screen for classrooms, presentations and workouts. Need to count up instead? Switch to the stopwatch; for focused work sessions try the Pomodoro timer.
功能
- Any time up to 99 hours, or one-tap presets
- Alarm sound and optional notification
- Accurate in background tabs
- Full-screen mode for classrooms
- Time shown in the browser tab
常见问题
Does the timer keep running if I switch tabs?
Yes. Time is calculated from the clock, so it stays accurate, and the alarm still plays.
Can I get a notification?
Allow notifications when you start the timer and you'll get one when time is up.
Can I use it full screen?
Yes, click the full-screen icon at the top of the timer.