Online Countdown Timer — Free, Accurate, 60+ Presets

How It Works & Accuracy Technology

Standard browser JavaScript timers suffer from severe timing drift when tabs are hidden, minimized, or placed in background power-saving states. CountdownTimerHQ utilizes dedicated Web Worker threading and the HTML5 Web Audio API to maintain millisecond timing accuracy regardless of background tab throttling.

• 4 Browser-Synthesized Alarms: Choose from crisp Bell, Beep, Buzzer, and gentle Chime sounds generated on-demand without audio file downloads.
• Looping Interval Support: Automatically resets and loops for Tabata workouts, Pomodoro cycles, and boxing round training.
• Distraction-Free Fullscreen: Expand to full display size with high-contrast digits visible across classrooms, gyms, and conference halls.

Popular Timer Presets

• 1 Minute Timer — Quick steeping, breathing exercises, and micro-breaks.
• 5 Minute Timer — Rapid brainstorming, speed-reading, and tea brewing.
• 10 Minute Timer — Short presentations, meditation, and desk workouts.
• 15 Minute Timer — Standup meetings and power naps.
• 20 Minute Timer — The 20-20-20 eye strain rule and focused work sprints.
• 25 Minute Timer (Pomodoro) — Classic Pomodoro Technique productivity sessions.
• 30 Minute Timer — Meal prep, HIIT workouts, and baking timers.
• 45 Minute Timer — Academic lectures, study blocks, and deep work intervals.
• 1 Hour Timer — Full sixty-minute focus sessions, gym workouts, and roasting timers.

Frequently Asked Questions

Is this online countdown timer free?

Yes, CountdownTimerHQ is 100% free with no sign-up, registration, or hidden fees.

Does the timer continue when switching browser tabs?

Yes. Our background Web Worker thread prevents browser power-saving mechanisms from pausing the timer.

Can I use this timer in classrooms or gyms?

Yes. The responsive layout and fullscreen mode are optimized for projection on smartboards, TVs, and classroom monitors.