Online Timer

Countdown timer with alarm — runs in your browser

05:00
5 min10 min15 min20 min30 min1 hourCustom

Free Online Countdown Timer

Set any duration up to six hours, press Start, and the timer counts down with a progress bar and the remaining time mirrored in the browser tab title — switch tabs and still see it at a glance. A clear beep sounds when time is up.

Everything runs locally in your browser: no download, no signup, and it works on phones, tablets and desktops.

Frequently Asked Questions

Will the alarm work from another tab?

Yes — the beep plays and the tab title keeps showing the countdown.

Does it keep running if I lock my phone?

Mobile browsers may pause background pages; keep the tab in the foreground on phones for a reliable alarm.

Can I set hours?

Yes — up to 360 minutes (6 hours).

Is it free?

Completely free, no signup.

Related Tools

Try the Stopwatch, Pomodoro Timer or the 5 Minute Timer.