Countdown timer
Count down a duration or to a target date — full-screen, with an alarm, all in your browser.
Runs 100% in your browser00:00:00
How to use the countdown timer
- Set the time. Enter a duration (HH:MM:SS) or pick a target date and time.
- Start the countdown. Press Start; pause or reset at any point.
- Go full screen. Click Full screen for a big, distraction-free display.
About the countdown timer
A countdown is handy for focus sessions, workouts, cooking, presentations and timeboxing. Because this timer anchors to a real target timestamp instead of counting frames, it does not drift when your browser throttles background tabs. Switch to date mode to track the time remaining until a launch, exam or event. To convert between dates and Unix timestamps, see the epoch converter.
Frequently asked questions
- Yes. It tracks the actual wall-clock target time rather than counting ticks, so it stays accurate even if the tab is backgrounded or throttled.
- When the countdown reaches zero the display flashes and an optional sound plays. Allow sound on first interaction so your browser permits audio.
- Yes — switch to "Target date & time" to count down to an exact moment, like a launch or deadline.
- Yes. Use the Full screen button for a large, legible display on a projector or second monitor. Everything runs offline in your browser.