Free tool
Online alarm clock
Set a free alarm in your browser: pick a time or tap a preset, keep the tab open, and it rings with a loud beep and a flashing tab title. No signup, no download.
Current time
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How to make sure it actually rings
A browser alarm is only as reliable as the machine it runs on. Three things decide whether it wakes you:
Test the sound first
Tap Test sound before you rely on it. If you hear the beep, the alarm will ring; if not, check the volume and mute switch.
Stop the computer sleeping
Plug it in and set sleep to 'never' for the night. A sleeping computer means a silent alarm — no website can get around that.
Keep the tab open, volume up
The alarm lives in this tab. Leave it open (other tabs are fine), keep the volume up, and don't quit the browser.
When a browser alarm is enough — and when it isn't
An online alarm clock is genuinely useful for daytime jobs: a nap timer at your desk, a reminder to leave for a meeting, a backup while your phone charges in another room. The stakes are low and you're already half-awake.
As your main wake-up alarm, it has two structural problems. First, the failure modes are silent: a computer that went to sleep, a muted tab, or an automatic overnight update all produce the same result — no alarm, discovered at 9:40 a.m. Second, even when it rings perfectly, the Stop button is a single click. If you've ever turned off an alarm in your sleep or just slept through one entirely, a quiet laptop speaker with a one-click dismiss is the easiest alarm in the world to defeat.
The fix isn't a louder beep — it's separating the alarm from its off switch. WakeUpBroo rings on your iPhone with no snooze and no dismiss button; the only way to stop it is to read a rotating code from wakeupbroo.com/code on another device — like the computer this page is open on. By the time you've walked over and typed it, you're up. That's the difference between an alarm that makes noise and an alarm that gets you out of bed.
Set an alarm for a specific time
Each of these opens the same alarm with the time already filled in, plus the bedtimes that give you a full night before it:
Not sure what time to set?
Waking up mid-sleep-cycle is why some mornings feel broken even after eight hours. Use the sleep calculator to pick a wake time that lands between 90-minute cycles, then set it here — or in the alarm you actually trust.
FAQ
Frequently asked questions
Is this online alarm clock free?
Yes — completely. No signup, no download, no ads. Set a time and leave the tab open. It's a free tool from the makers of the WakeUpBroo iPhone alarm app.
Will the alarm ring if I close the tab or laptop?
No. A browser alarm only runs while the page is open, so the tab must stay open, the computer must stay awake, and the volume must be up. The tool asks your browser to keep the screen awake while an alarm is set, but a closed lid or shut-down computer stops everything — that's the hard limit of any online alarm clock.
Will it work if my computer goes to sleep?
Usually not — most computers pause everything, including browser timers and sound, when they sleep. Before relying on it, plug the computer in and set sleep to 'never' (or at least longer than your alarm), and use the Test sound button to confirm audio works.
Is a browser alarm loud enough to wake a heavy sleeper?
Honestly, usually not. Laptop speakers are modest, and the Stop button is one click — easy to press half-asleep and roll back over. If you regularly sleep through alarms, you need an alarm that can't be dismissed from bed: WakeUpBroo on iPhone has no snooze and no dismiss button — it stops only when you enter a rotating code from wakeupbroo.com/code on another device.
Can I set the alarm for a time tomorrow?
Yes. If the time you pick has already passed today, the alarm is automatically set for that time tomorrow — the countdown under the clock shows exactly how long until it rings.
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Need an alarm you can't click away?
A browser alarm stops with one click. WakeUpBroo has no snooze and no dismiss button — the alarm stops only when you read a rotating code from this website on another device. Free to download, 7-day free trial.
Free on iPhone · Android in development