Online Alarm Clock
Set an alarm online with this free alarm clock. Choose a time, add a sound or label, and press Start alarm — no app needed.
Works in any browser on desktop and mobile.
Your recent alarms are saved automatically. Click any alarm to load its settings, then press Start alarm.
Your recently used alarms will appear here.
Timezone alarms use the local time of another city. Click any saved timezone alarm to load it.
Timezone alarms you set will appear here.
Create a timezone alarm
Search for a city and open the alarm with the correct timezone already set.
How to set an alarm online
- Select the hour and minute for your alarm.
- (Optional) Add a label or choose a sound.
- Click "Start alarm" or press Enter.
- Keep the page open until the alarm rings.
Free Online Alarm Clock
This alarm clock runs in your browser — no downloads or accounts. If the time has passed today, the alarm is set for the next day.
Use it for wake-up calls, meetings, medication reminders, or appointments.
Related time tools
Use our Online Timer for countdowns, or the Pomodoro Timer for focused work sessions with automatic breaks. Measure elapsed time with the Online Stopwatch, count clicks or events with the Online Counter, or check the current time with the Online Clock.
Frequently asked questions
- How do I set an alarm for a specific time?
- Use the hour and minute controls, add an optional label and sound, then click "Start alarm".
- Will the alarm work if I close the tab? Why didn't it go off?
- It only works while this page stays open. Closing the tab, sleeping the device, or locking the phone can stop sound — keep the page visible and volume up; test first if unsure.
- Can I set different sounds or messages for each alarm time?
- Yes. Use the Label and Sound rows; settings save when you start. "Test alarm" previews the sound.
- Can I use it on my phone?
- Yes, in mobile browsers. Many phones mute background tabs — keep the page in the foreground or adjust audio settings.
- Are my alarm settings saved? Can I bookmark an alarm?
- Yes — per time slot. Recent alarms load that time, label, and sound when clicked; press Start alarm to arm it. Each time has its own URL for bookmarks or sharing (e.g. #t=07-10).