Is this countdown timer free?

Yes, completely free with no signup and no usage limits.

Does it send any data to a server?

No. Everything runs in your browser using JavaScript — no data is uploaded anywhere.

Yes. Works in Safari, Chrome, and Firefox on iOS and Android. Keep the screen on to hear the alarm.

设置自定义时、分、秒倒数计时,搭配声音闹铃。

Hours Minutes Seconds

00:05:00

Ready

Enter the desired duration using the hours, minutes, and seconds inputs.
Click Start to begin the countdown. The display updates every second.
An audio alarm plays when the timer reaches zero. Click Reset to start over.

Is this countdown timer free?: Yes, completely free with no signup and no usage limits.
Does it send any data to a server?: No. Everything runs in your browser using JavaScript — no data is uploaded anywhere.
Does it work on mobile?: Yes. Works in Safari, Chrome, and Firefox on iOS and Android. Keep the screen on to hear the alarm.

Last updated: 2026-05-20 By jarvisbox