30 Second Timer
This is a free 30 second timer that counts down and sounds an alarm when it finishes. Press Start — no signup needed.
30 Second Timer
0:30
Ready — press Start.
What is the 30 second timer good for?
Thirty seconds is the classic interval length: long enough to matter, short enough to repeat. This free 30 second timer counts it down and sounds an alarm the moment it ends — no signup, just press Start.
Use it for HIIT rest periods between exercises, a plank finisher at the end of a workout, or reheating coffee without overdoing it. Dentists even recommend the 30-second rule when brushing: thirty seconds per quadrant of your mouth adds up to the full two minutes.
Popular uses
- HIIT rest intervals
- Plank finishers
- 30 seconds per quadrant when brushing teeth
- Reheating drinks
30 Second Timer questions
How do I start the 30 second timer?
Press the Start button and the countdown begins immediately. You can pause and resume at any point, or reset to start over.
Will the alarm sound if I switch tabs?
Yes. The timer is driven by your device clock rather than the animation, so it keeps accurate time in background tabs. Keep the page open and make sure your device volume is on to hear the alarm.
Can I pause and resume the timer?
Yes — the Start button becomes Pause while running, and Resume when paused. Reset returns the timer to its full duration.
Is this timer free to use?
Completely free, with no account or signup. It runs entirely in your browser.