Short exercise rounds
Time one 30-second exercise or rest period. Reset and start each new round manually.
Second Timer
Thirty seconds, ready to start. Choose a preset or enter the exact number of seconds you need. Free, no signup.
- Saved in this browser
- No download or sign-up
Ready to start
Seconds SECONDS
Click the number to edit your seconds
Quick seconds
SpaceStart / PauseRResetFFocus mode
Keep this page open and your device awake.
A few seconds for everyday moments
Recently completed
Completed countdowns will appear here.
Records are saved only in this browser.
A countdown set in seconds
This timer counts down from a duration, rather than showing the current clock time. Use it for a short round, a speaking turn, or a timed pause.
How to use it
1. Choose your seconds
Enter a whole number from 1 to 86,400, or choose a preset such as 10, 30, or 90 seconds.
2. Press Start
Pause holds the remaining seconds; Resume continues. Reset returns to your selected duration.
3. Choose the finish
Set your ringtone and volume in the header. At zero, the page shows Time’s up and plays the selected sound unless muted.
Ways to use this timer
Classroom questions
Give students 45 or 60 seconds to think about an answer. Use full screen for a shared countdown.
Brief speaking turns
Choose 90 or 120 seconds for one update, pitch, or response. Keep the remaining seconds visible.
Games and puzzles
Give a player ten seconds to answer or sixty seconds to solve a clue. Reset before the next turn.
Second Timer FAQ
How do I start a 30 second timer?
On your first visit, with no saved state, 30 seconds is selected. Choose the 30-second preset and press Start to use it again. Replacing an active countdown requires confirmation.
Can I set one or five seconds?
Yes. Enter any whole number from 1 to 86,400 seconds. Presets are shortcuts, not the only durations available.
Does it repeat automatically?
No. It runs one countdown at a time. When it finishes, choose Start again to repeat the original duration, or reset and start. Temporary time adjustments do not change the duration for your next round.
Can I share a preset duration?
Yes. Choose the seconds, then use the sharing toolbar. The link includes your selected duration; opening it prepares a new countdown, not a live copy of your session.
Is this a clock that shows the current second?
No. It counts down a duration. To measure elapsed time instead, use the Stopwatch. To set a reminder for a clock time, use Alarm Clock.
Will the countdown appear in the tab title?
Yes, while running. Background tabs may update less often, and device sleep can prevent alarm playback. Keep your device awake.
Can I prepare before the countdown starts?
Yes. Timer settings offer a 3- or 5-second preparation countdown that does not use your timer duration. You can cancel preparation. Resuming a paused timer skips preparation. You can also toggle tenths of a second.
Can I add or subtract seconds while timing?
Yes. While running or paused, use −5, +5 or +10 seconds to adjust this round’s remaining time and total duration. At least 1 second must remain, and the total cannot exceed 86,400 seconds. Reset returns to the original duration.
Are my timer and records saved after reloading or closing the page?
If local storage is available, the current timer, timer preferences and latest 10 naturally completed rounds are saved. Running timers resume against their deadlines; paused timers stay paused. Expired timers are recorded as complete without replaying sound. Closing the page or letting the device sleep prevents reliable alerts. Records do not sync across devices.