Online Alarm Clock

Online Alarm Clock is a free alarm you set right in your browser — no app to install, no account to create. Open the page, pick a time, choose a sound, and press start. That's it. It runs on the device in front of you, which is why it's handy on a laptop or desktop that's already awake and plugged in when your phone is charging in another room.

We built it to do the one thing a browser alarm should do well: ring on time, every time, without getting in your way. There are no pop-ups begging you to install an app, no locked features, and nothing to pay for. The same page also gives you timers, a stopwatch, countdowns, and a dozen more time tools when you need them.

Setting an alarm takes three steps:

1. Choose your time. Type the hour and minute, or tap one of the quick-set buttons for common wake-up times like 6:00, 7:00, or 8:00 AM.

2. Pick a sound and a label. Choose from 15 alarm sounds and, if you like, add a label such as "Meeting" or "Leave for gym" so you know at a glance what the alarm is for.

3. Press start. Keep the tab open and the alarm will ring at the set time, even if you switch to another tab. You'll see a clear countdown to your alarm so you always know how long is left.

Want a repeating alarm? Turn on daily repeat and it will ring at the same time each day the tab is open.

Not every wake-up needs the same sound. A gentle chime is enough for a light nap; a loud, insistent buzzer is better if you sleep through everything. Online Alarm Clock gives you 15 sounds — from soft bells and digital beeps to nature sounds like ocean waves, birdsong, and rain — so you can match the alarm to the moment.

You can set several alarms at once, each with its own time, sound, and label — useful for a wake-up alarm, a "leave the house" alarm, and a reminder later in the day. When an alarm rings, hit snooze for a few more minutes or dismiss it entirely. Your alarms and settings are remembered on your device between visits, so your usual times are ready next time.

These are the questions people actually ask, answered plainly:

If I switch to another tab? Yes. The alarm keeps its own time and will ring even while you're working in a different tab.

If I close the tab or the browser? No. A browser alarm needs the page open to ring. Leave the tab open — you can minimise the window, that's fine.

If my computer goes to sleep? A sleeping or powered-off computer can't play a sound, so make sure your machine stays awake until the alarm time (adjust your power settings if needed).

If my sound is muted? The alarm plays through your device's audio, so keep the volume up and the tab un-muted. It's worth doing a quick test the first time so there are no surprises.

Online Alarm Clock runs anywhere with a modern browser — Chrome, Safari, Firefox, and Edge — on Windows, macOS, Linux, Android, and iPhone. There's nothing to download and nothing that depends on your operating system, because everything runs in the browser itself.

On a phone, keep the screen on (or your phone awake) for the alarm to sound reliably, the same way any web page needs to stay active. On a desktop it's effortless: leave the tab open in the background and carry on with your day.

An alarm is just the start. The same site includes the tools you reach for during a normal day, all free and all in the browser:

Timer for anything you're counting down — cooking, laundry, a quick break. Stopwatch for workouts, lab work, or timing a task. Countdown to a date or event, down to the second. Pomodoro timer for focused 25-minute work sessions. World clock to check the time across cities. Sleep calculator to find good bedtimes based on sleep cycles. Plus a cooking timer, Tabata/HIIT timer, meditation timer, white-noise player, and date, age, and time calculators.

Everything shares the same simple, no-friction design: open it, use it, done.

If you always get up at the same time, use a ready-made page instead of typing the time in. Each one opens with the alarm pre-filled so you're one click from done — handy to bookmark for your regular routine:

Popular choices include 6:00 AM and 6:30 AM for early starts, 7:00 AM and 7:30 AM for a standard morning, and 8:00 AM for a slower start. Pick the closest time and adjust the sound or label to taste.

If you're a heavy sleeper, a louder sound is only part of the answer. A few things that genuinely help:

Put the device out of reach. If you have to stand up to turn it off, you're far less likely to fall back asleep. Use a rising or harsh sound. Gentle chimes are easy to sleep through; pick one of the louder buzzers. Stack two alarms a few minutes apart. The first stirs you, the second gets you up. Keep a consistent wake time. Waking at the same time daily makes any alarm easier to respond to, because your body starts to expect it. Test the volume the night before so you're not relying on an alarm you've never actually heard.

If you struggle to start or to stop, try the Pomodoro timer built into the site. Work in a focused 25-minute block, then take a 5-minute break; after four blocks, take a longer break. The short, fixed sessions make big tasks feel approachable and give you permission to rest without guilt. It pairs naturally with the alarm and countdown tools when you're planning a study session or a deadline sprint.

Privacy here is simple because the tools are simple. Your alarms, timers, and settings are stored in your own browser — not on a server. There's no account to create, no email to hand over, and no personal information collected to run an alarm. Close the tab and your data stays with you. That's the whole point of a lightweight, browser-based tool: it does its job and gets out of the way.