Alarm Clock
Set alarms with custom sounds and repeat options
How to use Alarm Clock
Set online alarm clocks with custom sounds and repeat options. Works in the browser tab. Free online alarm clock tool.
What is an online alarm clock used for?
A browser-based alarm is a lightweight alternative to phone alarms for desktop use — no app to install, works on any device with a browser, and does not require picking up your phone.
- Work reminders: Set an alarm for a meeting, a call, a deadline, or a break — without leaving your browser or unlocking your phone. Stays on-screen while you work.
- Medication reminders: For medications taken at specific times, a browser alarm on a desktop computer provides a visible and audible reminder without relying on a phone alarm.
- Pomodoro breaks: Use as a simple timer — set for 25 minutes of work, then 5 minutes of break, without the overhead of a full Pomodoro app.
- Cooking: Set while working at your computer — hear the alarm from the kitchen when a dish needs attention.
- Naps: Set a 20-minute power nap alarm when resting at your desk — the alarm wakes you before you enter deep sleep.
Browser permissions: Browser alarms require the tab to be open and may require notification permission to play sound when the tab is in the background. For reliability, keep the tab active and enable audio autoplay for the site.
Frequently Asked Questions
Does the alarm work if I minimize the browser?
Yes, if the browser tab is still open and audio autoplay is permitted for the site. Some browsers throttle background tabs — the alarm may trigger slightly late. For critical alarms, keep the tab visible or use your phone as a backup.
Can I set multiple alarms?
This tool supports setting one alarm at a time. For multiple simultaneous alarms, open multiple browser tabs — each can have its own time set. For persistent, recurring multiple alarms, a dedicated alarm app on your phone or computer is more reliable.
What sounds are available?
The alarm plays a notification sound through your browser's audio system. The specific sound depends on the tool's implementation. For custom alarm sounds (your own audio file, a specific ringtone), a dedicated alarm app on your device offers more customization.
Will the alarm work if my computer sleeps?
No — when a computer sleeps or hibernates, browser tabs are suspended and JavaScript stops executing. Set your computer to stay awake if you need a browser alarm to fire reliably. Alternatively, use your phone's native alarm clock which operates independently of the OS sleep state.
How is a browser alarm different from a phone alarm?
A phone alarm is managed by the OS — it fires even when the phone is sleeping, the app is closed, or the phone is on silent (with override settings). A browser alarm is a web page with a countdown — it requires the browser tab to be open and the browser to be running. Phone alarms are more reliable for waking up; browser alarms are convenient for in-computer-session reminders.
Browser alarm vs phone alarm vs calendar reminder vs smart speaker
A phone alarm is the most reliable — fires even when the phone is asleep, independent of any app. A calendar reminder (Google Calendar, Outlook) sends a notification before an event and syncs across devices. A smart speaker alarm (Alexa, Google Home) is hands-free — set with voice and plays audio without a screen. A browser alarm is convenient for in-session reminders without switching away from your work — the right tool when you are already at your computer.