Countdown Timer & Stopwatch

• The Countdown tab lets you set any time from seconds to hours using the custom input or 9 built-in presets.
• A circular progress ring gives a visual sense of remaining time at a glance.
• An audio alarm plays when the countdown reaches zero — mute it with the bell icon if needed.
• Use ±10s / ±30s / ±60s buttons to fine-tune the remaining time without resetting.
• The Stopwatch tab tracks elapsed time to hundredths of a second with unlimited lap recording.
• Laps are color-coded: fastest lap in green, slowest in red.
• Both modes support full-screen for use on a projector, TV, or large monitor.

Use Cases

Frequently Asked Questions

Can I use this countdown timer for free?

Yes — completely free with no account, no ads interrupting the timer, and no download required. Open the page and start timing immediately.

Does the alarm work when the browser tab is in the background?

In most modern browsers (Chrome, Firefox, Edge), the Web Audio API continues to run when a tab is backgrounded, so the alarm will play. Safari may throttle background tabs — keep the tab visible or use a browser that supports background audio for reliable alerts.

What is the maximum countdown time I can set?

The custom input supports up to 99 hours, 59 minutes, and 59 seconds — over 4 days of continuous countdown if needed.

Does the stopwatch count milliseconds?

Yes. The stopwatch displays time in MM:SS.cs format (centiseconds — hundredths of a second) for durations under one hour, and HH:MM:SS.cs for longer durations.

How accurate is this timer?

The countdown anchors to the system clock via Date.now() rather than counting ticks, so it does not drift when paused and resumed or when the browser is under load. Accuracy is within a few milliseconds of the system clock.

What is the difference between a countdown timer and a stopwatch?

A countdown timer starts from a set duration and counts down to zero, often used to limit time for tasks. A stopwatch starts from zero and counts upward, used to measure elapsed time for events, workouts, or speed challenges.

Can I set multiple timers at once?

Open multiple browser tabs — each tab runs its own independent timer. This is useful for cooking when you have multiple dishes with different finish times.

How do I use this as a Pomodoro timer?

Click the 25 min preset and press Start for your work block. When the alarm sounds, click Reset, then click the 5 min preset for a short break. Repeat. For a long break after 4 pomodoros, use the 15 min preset.

What does the ±10s / ±30s / ±60s adjustment do?

These buttons add or subtract seconds from the remaining countdown time while it is paused. Useful if you need to quickly extend or shorten the timer without resetting and re-entering a new time.

Does this timer work on mobile?

Yes — the interface is fully responsive and works on iOS and Android browsers. Note that some mobile browsers may suspend audio when the screen locks; keep the screen on if you need the alarm to sound reliably.