Online Alarm Clock
Set an alarm for any time and it rings right here in your browser.
Current time
Popular countdown timers
Counting down rather than waking up? Every timer has its own page.
Open the online timer to set any duration in hours, minutes and seconds, or use the online stopwatch to count up with lap times. There is also a full-screen online clock and a countdown to any date.
Common wake-up times
Jump to an alarm that is already set. You can still change it on the page.
How this alarm clock works
Pick a time, choose a sound, and press Set Alarm. The alarm is anchored to a real clock instant rather than a running countdown, so switching tabs, locking your screen or refreshing the page does not move it. If you have the site open in more than one tab, only one of them will actually make a noise.
It does need this tab left open. A web page cannot ring after you close it, quit your browser, or turn the device off. Use Test sound before you rely on it, and for anything important set a second alarm on your phone as well.