How to Use an Online Alarm Clock
Set alarms right in your browser - no apps, no phone needed.
What is an Online Alarm Clock?
An online alarm clock is a web-based tool that plays a sound at a specified time. Unlike phone alarms, it runs in your browser and uses your computer's speakers.
It's perfect for quick reminders, naps at your desk, or when your phone isn't available. Just set the time, keep the tab open, and you'll hear the alarm.
When to Use an Online Alarm
Power Naps
Set a 20-minute alarm for a quick afternoon nap at your desk. Loud enough to wake you, no phone needed.
Meeting Reminders
Set an alarm 5 minutes before your next call. Works even if your calendar notifications are buggy.
Cooking & Laundry
Set an alarm to check the oven or switch the laundry. Louder than your phone across the house if speakers are on.
Break Time
Reminder to take breaks, stretch, or step away from the screen. Especially useful for remote workers.
Hotel Wake-Up
Don't trust the hotel alarm clock? Set one on your laptop as backup. Works offline once loaded.
How to Set an Online Alarm
Choose the Time
Set the exact time you want the alarm to go off. Use AM/PM or 24-hour format.
Select a Sound
Pick an alarm sound that will wake you. Test it first to make sure volume is right.
Keep the Tab Open
The alarm only works while the browser tab is open. Don't close it or shut down your computer.
Turn Up Volume
Make sure your computer speakers are on and volume is high enough to hear.
Tips for Reliable Alarms
Prevent Sleep Mode
Adjust power settings so your computer doesn't sleep before the alarm. The alarm won't sound if the computer sleeps.
Test First
Set a test alarm for 1 minute from now. Confirm sound works and volume is appropriate.
Use as Backup
For critical wake-ups, use alongside your phone alarm. Two alarms are better than one.
Check Time Zone
Online alarms use your computer's time. Make sure your system clock is correct, especially when traveling.
Online Alarm vs Phone Alarm
| Feature | Online | Phone |
|---|---|---|
| No app needed | ✓ | ✗ |
| Works with screen off | ✗ | ✓ |
| Louder speakers possible | ✓ | ✗ |
| Battery independent | ✓ | ✗ |
| Portable | ✗ | ✓ |
| Best for | Office/home desk | On the go |
Common Issues
Alarm didn't sound?
Check: Was the tab closed? Did computer sleep? Was volume muted? Did browser block autoplay? Test again with a 1-minute alarm.
Sound is quiet?
Check system volume, browser tab volume, and speaker volume. Some browsers have per-tab volume controls.
Wrong time?
The alarm uses your computer's time. Check your system clock settings, especially timezone and daylight saving time.
Set an Alarm Now
Our free online alarm clock features multiple alarm sounds, snooze function, and works in any browser. No signup required.
Open Online Alarm