Online Countdown Timer
Set a countdown with one-click presets or enter any custom duration. Get an audio beep when time is up.
Online Countdown Timer
This countdown timer runs entirely in your browser. Choose from twelve one-click presets covering the most common durations — from a 1-minute quick task to a 2-hour study block — or enter any custom time using the hour, minute, and second fields.
How to Use
- Click any preset button to start the countdown immediately, or enter a custom duration in the H:M:S fields and click Start.
- The progress bar shows how much time remains. It turns red when less than 10% is left.
- When the timer reaches zero, a two-tone audio beep plays through your speakers.
- Use Pause to freeze the countdown, then Resume to continue. Reset clears everything.
Features
- 12 preset durations with descriptive labels for common use cases
- Custom H:M:S input for any duration up to 23:59:59
- Visual progress bar that turns red near the end
- Audio beep notification using the Web Audio API
- Pause and resume support
- Works offline after the page loads
Frequently Asked Questions
Does the countdown timer work without internet after the page loads?
Yes. Once the page is loaded, the countdown timer runs entirely in your browser using JavaScript. No server connection is needed.
How accurate is the online countdown timer?
The timer uses JavaScript setInterval with one-second ticks. It is accurate to within one second under normal browser conditions. Background tabs in some browsers may throttle the interval slightly.
Can I set a timer longer than 2 hours?
Yes. Use the custom H:M:S input fields to set any duration up to 23 hours, 59 minutes, and 59 seconds.
Will the timer beep if my device is on mute?
The timer uses the Web Audio API to generate a beep through the browser. If your device volume is muted, you will not hear the sound. Make sure your speakers or headphones are on.
Related Tools
Stopwatch · Pomodoro Timer · Count Up Timer · Interval Timer