FREE · TIME & DATE TOOLS
Online Alarm Clock.
Set an alarm in your browser with a label, a repeating chime, a 5-minute snooze and a desktop notification.
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How to use Online Alarm Clock
Choose the time and a label, then press “Set alarm”. When it rings, press Stop or Snooze.
How it works
The next occurrence of the chosen time is computed (today or tomorrow) and checked twice a second; the chime is synthesised with the Web Audio API.
Example
An alarm set at 23:00 for 07:00 shows “in 8 h 0 min” and rings the next morning if the computer stays awake.
Questions about Online Alarm Clock
Is Online Alarm Clock free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
The tab must stay open, the sound on and the computer awake; sleeping devices do not ring. Use your phone’s alarm for important wake-ups. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.