Custom Countdown Timer
Set any duration and start counting down
Space start/pause · R reset · +− adjust
Floating Picture-in-Picture needs a Chromium browser; this one doesn't support it.
Background sound
OffShare this timer — the link opens with the same duration and name preset, free on any device
Uses your device's local time zone and keeps the absolute finish time accurate across background tabs and daylight-saving changes.
Supports: 5m, 1h, 90s, 1:30, 01:30:00, or plain English like “5 minutes 30 seconds”
Quick Presets
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.
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
Input Formats
5m5 minutes1h1 hour90s90 seconds1:301 minute 30 seconds01:30:001 hour 30 minutes
Frequently Asked Questions
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.