Set 3 Seconds Timer Online
Set timer for 3 Seconds directly in your browser. This free online countdown clock counts down from 3 seconds to zero and plays a loud alarm when time is up. To start the timer, simply click the Start button above.
Popular Uses
- 3-2-1 Launch Countdown - use the classic 3-second countdown to signal the start of a race, game round, or live recording.
- Social Media Hook Timing - measure the critical first 3 seconds of a video — the window that determines if viewers stay or scroll.
- Breathing Intervals - time the 3-second inhale phase in box breathing or 4-7-8 techniques to build focus and calm.
- Reaction Games - give players exactly 3 seconds to respond before losing a point in quiz games or rapid-fire challenges.
- Yoga Pose Micro-Holds - hold each position for 3 seconds during a dynamic warm-up to activate the target muscle group.
Frequently Asked Questions
Does this 3 seconds timer make a sound?
Yes. When the countdown reaches zero, the browser plays a short alarm chime. Keep the tab open and your device volume enabled.
Can I use this timer in full screen?
Yes. Use the full-screen button to turn the countdown into a large display for classrooms, workouts, meetings, cooking, or livestreams.
How many seconds is this timer?
This countdown is exactly 3 seconds long.
More Timer Durations
Need a different time? Select from our quick preset timers below.
Seconds:
Minutes: