How to Use CountdownTimerHQ
Complete guide to setting countdown timers, loop intervals, alarm tones, and fullscreen display mode.
Step-by-Step Instructions
- Select or Enter Time: Choose any preset duration or enter custom hours, minutes, and seconds.
- Press Start: Click the Start button. Fullscreen or loop mode can be enabled at any time.
- Background Tab Accuracy: Leave the tab running; our Web Worker ensures zero timer lag even when you switch tabs.
Frequently Asked Questions
- How do I start a countdown timer?
- Choose a timer duration from the homepage, then click the Start button. The timer begins counting down immediately and shows the remaining time in large digits.
- Can I pause the timer?
- Yes. Click the Pause button to freeze the timer at any time, then click Resume to continue from exactly where you paused — no time is lost.
- How do I add more time during a countdown?
- While the timer is running or paused, click the +1 min or +5 min buttons to add time without restarting. The countdown continues from the new total.
- How does fullscreen mode work?
- Click the Fullscreen button to expand the timer to fill your entire screen. This is useful for classroom activities, group workouts, and presentations.
- Will the timer work if I switch to another tab?
- Yes. A Web Worker keeps the countdown accurate even when the tab is in the background. The browser tab title also updates every second.