Online Alarm Clock

Set an alarm in your browser — free, reliable, with gentle wake and screen wake lock.

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Set the alarm time

HourMinute

Alarm name

Repeat

Quick Alarms

Quick Timer Alarm

Your alarms

About this online alarm clock

This alarm runs right in your browser — no app, no download, nothing to install. Pick a time, choose a sound, and the page keeps your screen on so it doesn't drift off before the alarm rings. It works the same way on phones, tablets, and computers.

How this online alarm clock works?

This online alarm clock keeps your screen from locking and tracks the exact time you picked, not just a rough countdown, so it won't drift late. Your sound is ready to play the instant it's due, and the tab title updates so you can glance over and see it's armed. Keep the tab open — if the browser closes or the device fully sleeps, the alarm can't ring, so pair it with your phone's alarm for anything you can't afford to miss. Adjustable mechanical alarm clocks date back to 15th-century Europe, with the first patented design arriving in 1847 (Wikipedia, CC BY-SA 4.0) — this one just swaps gears for your browser's clock.

Browser alarm vs. phone alarm — which should you use?

A phone or computer's built-in alarm can ring even when the screen is off or the device is locked, because it's part of the operating system. A browser alarm like this one only works while the tab stays open — but it needs no install, no account, and keeps nothing about you. Use this one for naps, focus sessions, and everyday reminders. Pair it with our Pomodoro timer for structured work blocks. For anything you truly can't miss, like an early flight or an exam, set both as backups for each other.

Why when you wake up matters as much as when?

Your body cycles through lighter and deeper sleep every night, and waking up in the middle of deep sleep is what makes mornings feel especially rough. Waking near the end of a sleep cycle instead of the middle usually feels a lot easier. That's why this alarm offers a spread of quick-pick times close together — so you can nudge your wake-up toward a gentler moment instead of just picking a round number.

Gentle wake: waking up gradually instead of all at once

Gentle wake slowly raises the volume over 30 seconds instead of blasting sound at full volume right away. Waking up gradually like this feels a lot less jarring than a sudden loud alarm — especially if you're a light sleeper. The idea itself is old: a gradual wake-up effect called "mechanical sunrise" was first patented in 1890, long before electronic versions arrived in the 1970s (Wikipedia, CC BY-SA 4.0).

Choosing the right alarm sound

Different sounds wake people differently — a soft tone suits a gentle morning, while a sharp beep works better when you truly can't afford to oversleep. This alarm includes eight built-in sounds, from calm chimes to loud digital beeps, plus the option to upload your own. Preview any sound before you rely on it so you know exactly what you'll hear.

How snooze works, and when to skip it?

Snooze delays the alarm by a few minutes so you can drift back to sleep briefly before it rings again — handy once, but tapping it over and over just fragments your sleep and leaves you groggier. You can set your snooze length anywhere from 1 to 30 minutes. If you're snoozing every morning, that's usually a sign to just move your alarm time later instead.

Built to work for everyone

Every part of this page works with just a keyboard, and screen readers announce the time and alarm status clearly. If you run into anything that doesn't work well for you, email [email protected] and we'll fix it.

Reliability and battery use

Keeping your screen on so the alarm can ring does use a little extra battery — usually not much more than watching a video. If you're setting an alarm overnight, it's safest to plug your device in. And since a browser alarm depends on the tab staying open, treat it as a reliable backup rather than your only alarm for anything critical.

How the browser alarm compares

How the browser alarm compares
	This browser alarm	iOS alarm	Android alarm
Install required?	No — opens in browser	Pre-installed (Clock app)	Pre-installed (Clock app)
Works with device locked?	No — tab must stay open	Yes	Yes
Works with screen off?	Yes if Wake Lock granted	Yes	Yes
Tracking / analytics	None	Apple ecosystem data	Google ecosystem data
Custom sound	8 built-in + your upload	30+ presets + Apple Music	30+ presets + audio file
Snooze length adjustable	Yes (1–30 min)	Fixed 9 min	Adjustable (Google) / Fixed (Samsung)

Frequently asked questions

Will the alarm work if I close the browser tab?

No. The alarm runs entirely in your browser, so the tab must stay open. We turn on the Screen Wake Lock so your device does not sleep, but if the tab is closed the alarm will not fire.

Does this online alarm work on iPhone and Android?

Yes. It works in any modern browser including Chrome, Safari, Firefox and Edge. On iOS 16.4 and later we use the native Screen Wake Lock API; on older iOS we fall back to NoSleep.js so the screen still stays on.

Is the time on the page my local time?

Yes. The clock reads your device's local time and timezone — set an alarm for 7:00 AM and it fires at 7:00 AM wherever you are. We never use server time.

How do I set an alarm for a specific time?

Tap any quick-pick (5:30 AM, 6:00 AM, …) to arm the alarm in one tap. Or pick the hour and minute, then press Set Alarm. AM/PM appears only in 12-hour locales.

What is gentle wake?

Instead of starting at full volume, the alarm fades in gradually over about 30 seconds. Helps you wake up without a jolt. Toggle it in Options.

Why doesn't my Mac alarm ring when the lid is closed?

Closing your laptop's lid puts it to sleep, and a browser alarm can't ring while the device is asleep — the page simply stops running. Keep the lid open and the tab visible, or set a backup alarm in your Mac's own Clock app for anything you really can't miss.

Does the alarm work offline once loaded?

Yes. After the first page load the alarm functions with no network connection. The audio file is cached locally and we do not call any server when the alarm fires. A future PWA manifest will let you install this as a fully offline app on iOS and Android home screens.

What is the loudest alarm setting?

The Quick beep and Digital alarm sounds peak at the loudest sustained volume your device speaker supports. For best results, raise device volume to maximum and turn Do Not Disturb off. The browser cannot exceed the operating-system volume cap — it can only play at or below the OS level.

Does this alarm work in the background?

The alarm fires when the tab is in the background, as long as the tab and browser process are alive. Some browsers (Chrome Energy Saver, Edge Sleeping Tabs) throttle background tabs without Wake Lock — this alarm acquires a lock when armed, which keeps the timer running at full speed.

Can I set a recurring weekday alarm?

Yes. Turn on Repeat in Options and pick the days you want — weekdays, weekends, or any custom mix. The alarm resets itself automatically for the next chosen day, and your schedule stays saved in your browser.

What alarm sounds are available?

The alarm ships with several distinct sounds — including a Quick beep and a Digital alarm tone — plus an optional gentle-wake fade-in that ramps up over about 30 seconds instead of starting at full volume. Pick your sound and gentle-wake preference in Options before you arm the alarm.

How accurate is the online alarm clock?

The alarm checks the real time continuously rather than just counting down, so it won't quietly drift late the way a simple countdown can. How accurate it stays mostly depends on your device's own clock and on the tab and device staying awake.

Is my data safe? What do you collect?

Everything — your alarms, timer settings, sounds, and preferences — is stored only in your own browser, never on a server. There's no account, and no personal data is ever sent anywhere or sold. See our Privacy page for details.

What's the difference between an online alarm and my phone's alarm?

A browser alarm is a great backup, not a replacement — it can't ring if your laptop is asleep or the tab is closed, but it also doesn't depend on your phone's battery or silent mode. It's most useful while you're already at a computer, where a big on-screen countdown is more convenient than reaching for your phone.

Free Online Tools

All the time management tools you need, completely free in your browser.