Free Online Timer with Alarm Sound
Everything I learned from users asking "why didn't my alarm go off?"
I've gotten a lot of emails about timer alarms not working. 90% of the time, it's one of a few common issues - usually something simple like the browser tab being muted or the computer going to sleep.
Here's how browser alarms actually work, why they sometimes don't, and how to make sure yours goes off when you need it to.
How It Works
Browser timers use the Web Audio API to play sounds. Unlike phone alarms that work at the system level, browser alarms need the webpage to stay open. Close the tab, and the timer stops.
The upside: no installation, no accounts, no permissions. Just open the page and start timing. The downside: you need to keep the tab open and your computer awake.
Choosing the Right Alarm Sound
The alarm sound you choose depends on your situation. A gentle chime works for meditation, while a loud buzzer is better for cooking emergencies.
Gentle Tones
Soft bells and chimes for meditation, yoga, and relaxation exercises. Won't startle you out of a calm state.
Classic Alarm
Traditional alarm clock sound. Reliable and instantly recognizable. Good for general-purpose timing.
Kitchen Buzzer
Loud and persistent. Designed to be heard over running water, exhaust fans, and kitchen noise.
Digital Beep
Clean electronic tone. Works well for workout intervals and productivity timing.
Always test your alarm sound before relying on it. Set a quick 10-second timer to confirm the volume level and that you can hear it from where you'll be when the timer ends.
Enabling Browser Notifications
For extra reliability, enable browser notifications alongside audio alarms. Notifications appear even if you're in another tab or have the browser minimized.
Allow When Prompted
When you first use a timer with notifications, your browser will ask for permission. Click "Allow" to enable alerts.
Check System Settings
On Mac, go to System Preferences → Notifications → Your Browser. On Windows, check Settings → System → Notifications.
Disable Do Not Disturb
Focus modes and Do Not Disturb will block notifications. Turn them off if you're expecting an important timer alert.
Troubleshooting Sound Issues
Timer alarm not working? Here are the most common causes and fixes:
No Sound at All
Check volume: System volume, browser tab volume, and speaker/headphone volume all need to be unmuted. Some browsers show a speaker icon in the tab that you can click to unmute.
Alarm Didn't Trigger
Keep the tab open: Browser timers stop if you close the tab. Also check that your computer didn't go to sleep before the timer ended.
Autoplay Blocked
Interact with the page first: Browsers block audio on pages you haven't clicked. Click anywhere on the timer page when you set it, and autoplay will be allowed.
Sound Cuts Out
Check power settings: Some laptops reduce audio performance in power-saving mode. Plug in or switch to balanced/performance mode.
Wrong Audio Output
Check output device: If you have headphones connected but aren't wearing them, sound might be playing there instead of your speakers.
Best Practices for Reliable Timer Alarms
- •Test before you rely on it. Set a quick 30-second timer to confirm everything works.
- •Keep the tab visible. Some browsers throttle background tabs, which can affect timing accuracy.
- •Disable sleep mode. Prevent your computer from sleeping during long timers.
- •Use notifications as backup. Enable browser notifications for visual alerts alongside audio.
- •Bookmark your timer. Save the timer page for quick access instead of searching each time.
Test It First
Before you rely on any timer, set a quick 10-second test. Make sure you can hear it from where you'll be. Better to know the volume is wrong now than when your food is burning.