Online Alarm Clock
The dial shows the time left until your alarm. Keep this tab open and it rings; alarms that passed while the page was closed are flagged.
Set an alarm
Your alarms
No alarms yet.
Screen and sound settings
Shortcuts: F full screen · Esc stop the sound
Free, no sign-up. Your timers, alarms and city list stay on this device.
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Before you rely on this alarm
Keep this tab open
This page plays the alarm. If you close the tab or the computer goes to sleep, it will not ring. For a wake-up alarm you cannot miss, use your phone's clock app.
Missed alarms are flagged
When you come back, any alarm that already passed is marked as missed and kept so you can turn it on again.
See how long until it rings
The dial shades the time from now to the next alarm, and the list says things like "in 6 h 12 min". Past 12 hours the dial shows a full turn.
Stop it or snooze
While it rings, a bar appears at the top with Stop sound and Snooze 5 min. An alarm turns off after it rings once.
Questions people ask
Will it ring if my computer goes to sleep?
No. Sleep, closing the tab or quitting the browser stops the page. When you come back, missed alarms are flagged.
Can it ring every day?
Not yet. An alarm turns off after it rings once; switch it back on in the list and it rings at that time next.
Why is there no sound?
Use Test sound and check the volume and silent mode. Browsers may block sound until you tap the page once, so after a refresh tap the page once.
How many alarms can I set?
Up to 12. Give each one a label and it shows when it rings.
Guides
- Why online timers run late in a background tabWhy a web timer can ring up to a minute late in another tab or stop when a phone screen turns off, explained from Chrome's documentation, and how to avoid it.
- Daylight saving time 2026–2027: when clocks change and how time differences shiftWhen clocks change in 2026 and 2027 in the US, UK, EU, Australia and New Zealand, how the gaps between cities shift for a few weeks, and who stopped changing.
- Lap time vs split time on a stopwatchLap time is how long one lap took; split time is the total from the start to that point. How to read the same laps both ways and spot your fastest lap.
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