Free Online Alarm Clock

This free alarm clock works entirely in your browser with no app download, no signup, and no subscription required. Set alarms directly in your browser — no app needed. ScreenTimer’s alarm clock supports multiple simultaneous alarms, custom labels, daily repeat, snooze, and fifteen unique alarm tones. Your alarms are saved in your browser and persist across sessions.

Fifteen Alarm Sounds

Every alarm tone is synthesized live in your browser using the Web Audio API — no file downloads, no copyright issues, instant playback. Choose from Classic Bell, Digital Beep, Gentle Chime, Urgent Alarm, Morning Birds, Soft Piano, Retro Game, Meditation Bowl, Military Bugle, Church Bell, Heartbeat, Xylophone, Ocean Wave, Radar Ping, and Rooster Call. Preview any sound before setting your alarm.

How It Works

Pick a time, add an optional label (like “Stand-up meeting” or “Take medication”), and tap Set Alarm. When the alarm fires, a fullscreen overlay appears with your label and two options: Snooze for 5 minutes or Dismiss. Enable daily repeat for recurring alarms. Toggle any alarm on or off without deleting it.

Important Note

Browser-based alarms require the ScreenTimer tab to remain open. If you close the browser or the tab, the alarm will not fire. For reliable wake-up alarms, keep ScreenTimer pinned in a browser tab.

Alarm Clock FAQ

Will the online alarm clock still ring if I close the browser tab?

No. Browser-based alarms only work while the ScreenTimer tab remains open. Keep the tab pinned in your browser for reliable workday alarms. For critical wake-up alarms, use your phone’s built-in alarm.

How many alarms can I set at the same time?

Unlimited. Each alarm has its own time, custom label, and daily repeat toggle. All alarms are saved in your browser and persist across sessions. Toggle any alarm on or off without deleting it.

Can I preview the alarm sounds before choosing one?

Yes. In the Alarm tab, select a sound from the dropdown and tap the Preview button to hear it before setting your alarm. All fifteen sounds can also be previewed in Preferences.

Does the alarm have a snooze button?

Yes. When an alarm fires, a fullscreen overlay appears with Snooze (creates a new alarm 5 minutes later) and Dismiss (stops immediately). The snooze alarm deletes itself after firing.

Can I set a daily repeating alarm?

Yes. Each alarm has a Daily toggle. When enabled, the alarm fires at the same time every day as long as the ScreenTimer tab remains open in your browser.