Online Alarm Clock
Set an alarm for a specific time directly in your browser. This online alarm clock lets you choose the exact hour and minute, select a sound, and get alerted when the time is reached. It works instantly on desktop and mobile without installation or login.
What this alarm clock does
This is a digital alarm clock that runs on the web. You select a clock time, and the alarm sounds when that time arrives.
You can:
- Set an alarm for AM or PM
- Add a custom label such as Wake Up or Meeting
- Choose an alarm sound
- Test the sound before starting
- Start the alarm with one click
It is designed for simple reminders, wake-up alarms, and daily scheduling.
How to set an alarm
1. Choose the time
Use the hour and minute selectors to choose your desired time. Select AM or PM if using a 12-hour format.
The large digital clock above helps you compare the current time with your selected alarm time.
2. Add a label (optional)
You can enter a short label, such as:
- Wake Up
- Study Session
- Call Reminder
- Workout
This makes it easier to identify the alarm if you use it multiple times.
3. Select a sound
Choose your preferred alarm sound from the Sound Choice menu. You can press Test to preview the sound and adjust your device volume if needed.
4. Start the alarm
Click Start Alarm. The system will monitor the current time and trigger the sound exactly when the selected time is reached.
Key features
Real-time digital clock display
The current time is shown clearly at the top of the page. This ensures you always know how much time remains until your alarm.
Works online with no login
This is a web-based alarm clock. You do not need to create an account or install an app.
Sound testing before activation
You can test the alarm sound before starting. This helps avoid missed alarms due to low volume or muted settings.
Mobile and desktop support
Works in modern browsers on:
- Windows and Mac computers
- Android phones
- iPhone and other iOS devices
Accuracy and reliability
How accurate is this alarm
The alarm uses your device’s internal clock and runs in real time inside your browser. It triggers when the system time matches your selected alarm time. For normal personal use, accuracy is reliable and consistent.
Does time zone affect the alarm
No. The alarm uses your device’s local time. If your device time zone changes, the alarm follows that updated local time.
What can prevent the alarm from sounding
The alarm may not play if:
- The browser tab is closed
- The device is powered off
- The system is in deep sleep mode
- Sound is muted or blocked by Do Not Disturb
For best results, keep the browser open and ensure volume is enabled.
Common uses of an online alarm
This online alarm clock can be used for:
- Morning wake-up alarms
- Study or work reminders
- Cooking and baking alerts
- Meeting and call notifications
- Kids routines and bedtime reminders
Because it runs on the internet, it is useful when you do not want to install a separate alarm app.
Alarm vs Timer vs Stopwatch
Understanding the difference helps you choose the right tool.
| Tool | Function |
|---|---|
| Alarm clock | Triggers at a specific clock time, such as 7:00 AM. |
| Timer | Counts down from a set duration, such as 30 minutes. |
| Stopwatch | Counts up from zero to measure elapsed time. |
Use the alarm when you need a reminder at a fixed time of day.