About the Custom Countdown Timer
Create a countdown timer for any duration. Enter hours, minutes, and seconds, or use the quick input to type durations like "5m" or "1h 30m". Name your timer and copy a shareable link to send the exact same timer to another device — free, no signup. Perfect for cooking, workouts, studying, classrooms, or any timed activity.
Like every TimerHub timer it counts to an absolute finish time, so it stays exact in a background tab and after your device sleeps, and a running countdown survives a reload. Read the timing accuracy methodology.
Input Formats
| 5m | 5 minutes |
|---|---|
| 1h | 1 hour |
| 90s | 90 seconds |
| 1:30 | 1 minute 30 seconds |
| 01:30:00 | 1 hour 30 minutes |
How to Set a Timer
- Use the number inputs to set hours, minutes, and seconds
- Or type a duration like '5m', '1h', '90s', '1h30m', or '1:30'
- Click 'Set Timer' or press Enter to apply
- Use quick preset buttons for common durations
- Adjust time while running with +/- buttons
- Name the timer and click 'Copy link' to share it with anyone
- Or choose a future date and time for deadline and event countdowns
Shortcuts
SpaceStart / pauseRReset+Add a minute (− removes one)FFullscreen
Single-key shortcuts can be switched off under More.
Countdown timer FAQ
How do I set a custom countdown timer?
Enter any combination of hours, minutes, and seconds, then press Start. The countdown timer runs in your browser and sounds an alarm when it reaches zero.
What is the longest countdown I can set?
You can set a countdown up to 9,999 hours, which covers everything from a few seconds to long-range events. For common durations, try our preset minute and hour timers.
Will the countdown timer alert me when it finishes?
Yes. The timer plays an alarm sound when it reaches zero, and you can enable notifications to get alerted even if the browser is in a background tab.
Does the custom timer work on mobile?
Yes. The countdown timer works in any modern mobile browser on iPhone and Android with no app download required.
Can I share a timer with someone else?
Yes, and it's free. Set your duration, optionally give the timer a name, and click Copy link. Anyone who opens the link gets the same timer preset on their device — great for classrooms, workouts, and group activities.
Can I count down to a specific date and time?
Yes. Choose a future local date and time and TimerHub converts it to an absolute target, including across daylight-saving clock changes.