Free Online Alarm Clock
Set an alarm that rings in your browser.
What is the Online Alarm Clock?
You don't always have your phone to hand, but you almost always have a browser tab open. This online alarm clock lets you set a time and get a sound alert right where you're already working — handy for a power nap, a load of laundry, something in the oven, or a reminder to step into a meeting.
It runs entirely in your browser: set a time, keep the tab open, and it rings.
Last updated: Aug 27, 2026
What does this tool do?
You pick a time and, optionally, a label. The clock shows the live current time and counts down in the background. When the moment arrives, it plays an alarm sound and shows an alert, which you dismiss to stop the sound.
Because it runs in the tab, the tab needs to stay open and your device unmuted for it to ring.
Key features
Set any time
Choose the exact hour and minute to ring.
Optional label
Name the alarm so you know what it's for.
Live clock
See the current time as it counts down.
Audible alert
A sound plays when the time arrives.
Dismiss to stop
One click silences the alarm.
Example
Common use cases
- Nappers — Wake up from a short rest on time.
- Cooks — Get alerted when something's ready in the oven.
- Remote workers — Remember to join a call or take a break.
- Students — Time a focused study or revision block.
- Parents — Set reminders around the house routine.
- Anyone — Get a nudge without reaching for a phone.
Benefits
- No app to install — it works in your browser.
- A label reminds you what each alarm is for.
- The live clock makes the countdown clear.
- Free with no sign-up.
Tips
- Keep the tab open and your volume up — the alarm can't ring from a closed tab.
- Do a quick test alarm a minute ahead so you know the sound works on your device.
- Add a label when you set more than one alarm in a session so they don't get confusing.
- Pin the tab in your browser so you don't close it by accident.
- For alarms while your computer sleeps, use a phone alarm instead — browser tabs pause when the device sleeps.
Common mistakes to avoid
Closing the tab after setting it
Fix: The alarm runs in the tab; keep it open or it won't ring.
Leaving the device muted
Fix: Unmute and raise the volume so the sound is audible.
Relying on it while the computer sleeps
Fix: Sleeping devices pause tabs — use a phone alarm for that case.
Not testing the sound first
Fix: Run a quick test so you know it works before you depend on it.
How it works
- 1
Pick a time
And an optional label.
- 2
Set the alarm
It counts down in the background.
- 3
It rings
A sound and alert fire at the time.
Frequently asked questions
No — keep the tab open and your device unmuted for the alarm to ring, since it runs in your browser.
Yes — add an optional label so you remember what the alarm is for.
No — it runs in your browser, so keep the tab open and your device unmuted for it to ring.
Yes — add an optional label so you remember what the alarm is for when it goes off.
No — browser tabs pause when the device sleeps. Use a phone alarm if the machine will be asleep.
Yes, completely free with no sign-up.
Conclusion
A no-fuss alarm right in your browser: pick a time, add a label, and it rings when the moment comes. Keep the tab open and the volume up, and it's the quickest way to set a reminder without touching your phone.