30 Minute Timer
One click, alarm when time is up
Set a 30 Minute Timer
Press Start and this page counts down exactly 30 minutes, then plays a clear alarm. The remaining time shows in the browser tab, so you can work in another window and still see it.
Half an hour for workouts, laundry cycles, meetings that must end, or a serious study block.
Runs entirely in your browser — free, instant, no signup.
Frequently Asked Questions
Do I need to keep this tab open?
Keep the browser running; the tab title shows the countdown even when you're on another tab.
Can I pause it?
Yes — Pause and Reset buttons are right under the display.
Is the 30 minute timer accurate?
It ticks on a 1-second interval from your device clock — accurate for everyday timing.
Is it free?
Yes, completely free.
Related Tools
Need a different length? Try the custom timer or the Pomodoro Timer.
设一个30 分钟计时器
点击开始，页面精确倒数 30 分钟，结束时播放清晰的提示音。剩余时间会显示在浏览器标签页标题上，切到别的窗口也看得见。
半小时：锻炼、洗衣机一轮、必须准时结束的会议，或一段正经的学习时间。
完全在浏览器内运行——免费、即开即用、无需注册。
常见问题
需要一直停在这个页面吗？
浏览器开着即可；切到其他标签页时，标题栏仍显示倒计时。
可以暂停吗？
可以——显示屏下方就有暂停和重置按钮。
计时准吗？
基于设备时钟每秒跳动，日常计时完全够准。
免费吗？
是的，完全免费。