Free online alarm clock — set, ring, dismiss, right in your browser.
07:06:14 AM
Thursday, June 25, 2026
How it works
Need a quick alarm without installing an app? This free online alarm clock lets you set any hour and minute, watch a live digital clock tick in real time, and hear a clear audio beep the moment your alarm fires — all powered by the Web Audio API directly in your browser. Supports 12-hour and 24-hour formats, custom alarm labels, and a live countdown to your alarm time.
Most browsers pause JavaScript when the screen is locked or the tab is in the background for extended periods. Keep the tab visible and your device screen on for reliable triggering. For critical alarms, use a dedicated alarm app on your phone.
This alarm clock runs entirely in your browser using JavaScript and the Web Audio API. There is no server-side component, so the tab must remain active and your browser must not suspend it for the alarm to fire at the right moment.
The current tool supports one alarm at a time. Dismiss or cancel the active alarm before setting a new one. For multiple concurrent alarms, consider your device's native clock app.
Browsers require a user interaction (such as a button click) before playing audio. Because you clicked 'Set Alarm', audio should be unlocked. If you still hear nothing, check that your device volume is turned up and that the browser tab is not muted.