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Countdown Timer (Online)

Set a countdown from seconds to hours with alert sound and fullscreen display. Perfect for cooking, workouts and breaks.

100% free No sign-up Private · runs in your browser

How to use the free online countdown timer

Set hours, minutes and seconds (or use a preset).
Press Start.
Pause/reset as needed.
A beep alerts you when time is up.

About this tool

Set a countdown for any duration — minutes and seconds — with a full-screen alert when time is up, plus optional sound. Great for workouts, breaks, cooking, presentations and Pomodoro-style focus sessions. Start instantly, pause anytime, and repeat with one click.

Key features

Seconds to hours
Alert sound on finish
Presets (1/5/10/25 min)
Fullscreen mode

Privacy first: every calculation and generation runs 100% locally in your web browser using the Web Crypto API. Your input never touches a server — nothing is stored, logged or sold.

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Frequently asked questions

Enter hours, minutes and seconds, then press Start. The timer counts down and beeps when it reaches zero.

Yes — Pause freezes the current time and Resume continues from exactly where you stopped.

When the countdown hits zero, a built-in alert sound plays (enable the sound toggle; first tap enables audio for browsers' autoplay rules).