5 Second Timer
Free online 5 second countdown timer with alarm
00:05
Space start/pause · R reset · ↑↓ adjust
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About the 5 Second Timer
Free 5 second timer with alarm. Quick countdown for exercises, games, and speed challenges.
Common Uses
- Quick exercise rep
- Game countdown
- Speed challenge
- Reaction time test
How to Use
- Click the Start button to begin the countdown
- Use the +/- buttons to adjust time while running
- Press Space to start/pause, R to reset
- Enable notifications for alerts even in other tabs
Frequently Asked Questions
Does the timer work in the background?▾
Yes, our timer continues running even if you switch to another tab or minimize your browser. You'll receive a notification when the timer completes.
Can I use this timer on my phone?▾
Yes, our timer is fully responsive and works on all devices including iPhone and Android. Simply open this page in your mobile browser.
Why do I need to enable notifications?▾
Enabling notifications allows you to get alerts when your timer finishes, even if you're in another browser tab. This is optional - the timer will still play a sound when complete.